blocks|key|39371|text|您可以尝试使用hotmail，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|39372|MailMessage+o+=+new+MailMessage("From",+"To","Subject",+"Body");
NetworkCredential+netCred=+new+NetworkCredential("Sender+Email","Sender+Password");
SmtpClient+smtpobj=+new+SmtpClient("smtp.live.com",+587);+
smtpobj.EnableSsl+=+true;
smtpobj.Credentials+=+netCred;
smtpobj.Send(o);|code-block|syntax|javascript|39373|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can try this using hotmail like this:-

<pre><code>MailMessage o = new MailMessage("From", "To","Subject", "Body");
NetworkCredential netCred= new NetworkCredential("Sender Email","Sender Password");
SmtpClient smtpobj= new SmtpClient("smtp.live.com", 587); 
smtpobj.EnableSsl = true;
smtpobj.Credentials = netCred;
smtpobj.Send(o);
</code></pre>

blocks|key|39385|text|只需浏览下面的代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|39386|SmtpClient+smtpClient+=+new+SmtpClient("mail.MyWebsiteDomainName.com",+25);

smtpClient.Credentials+=+new+System.Net.NetworkCredential("info@MyWebsiteDomainName.com",+"myIDPassword");
//+smtpClient.UseDefaultCredentials+=+true;+//+uncomment+if+you+don't+want+to+use+the+network+credentials
smtpClient.DeliveryMethod+=+SmtpDeliveryMethod.Network;
smtpClient.EnableSsl+=+true;
MailMessage+mail+=+new+MailMessage();

//Setting+From+,+To+and+CC
mail.From+=+new+MailAddress("info@MyWebsiteDomainName",+"MyWeb+Site");
mail.To.Add(new+MailAddress("info@MyWebsiteDomainName"));
mail.CC.Add(new+MailAddress("MyEmailID@gmail.com"));

smtpClient.Send(mail);|code-block|syntax|javascript|39387|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just go through the below code.

<pre><code>SmtpClient smtpClient = new SmtpClient("mail.MyWebsiteDomainName.com", 25);

smtpClient.Credentials = new System.Net.NetworkCredential("info@MyWebsiteDomainName.com", "myIDPassword");
// smtpClient.UseDefaultCredentials = true; // uncomment if you don't want to use the network credentials
smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
smtpClient.EnableSsl = true;
MailMessage mail = new MailMessage();

//Setting From , To and CC
mail.From = new MailAddress("info@MyWebsiteDomainName", "MyWeb Site");
mail.To.Add(new MailAddress("info@MyWebsiteDomainName"));
mail.CC.Add(new MailAddress("MyEmailID@gmail.com"));

smtpClient.Send(mail);
</code></pre>

blocks|key|39439|text|请尝试使用此代码。注意:在“发件人地址”中提供正确的电子邮件id和密码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|39440|protected+void+btn_send_Click(object+sender,+EventArgs+e)
{

++++System.Net.Mail.MailMessage+mail+=+new+System.Net.Mail.MailMessage();
++++mail.To.Add("to+gmail+address");
++++mail.From+=+new+MailAddress("from+gmail+address",+"Email+head",+System.Text.Encoding.UTF8);
++++mail.Subject+=+"This+mail+is+send+from+asp.net+application";
++++mail.SubjectEncoding+=+System.Text.Encoding.UTF8;
++++mail.Body+=+"This+is+Email+Body+Text";
++++mail.BodyEncoding+=+System.Text.Encoding.UTF8;
++++mail.IsBodyHtml+=+true;
++++mail.Priority+=+MailPriority.High;
++++SmtpClient+client+=+new+SmtpClient();
++++client.Credentials+=+new+System.Net.NetworkCredential("from+gmail+address",+"your+gmail+account+password");
++++client.Port+=+587;
++++client.Host+=+"smtp.gmail.com";
++++client.EnableSsl+=+true;
++++try
++++{
++++++++client.Send(mail);
++++++++Page.RegisterStartupScript("UserMsg",+"<script>alert('Successfully+Send...');if(alert){+window.location='SendMail.aspx';}</script>");
++++}
++++catch+(Exception+ex)
++++{
++++++++Exception+ex2+=+ex;
++++++++string+errorMessage+=+string.Empty;
++++++++while+(ex2+!=+null)
++++++++{
++++++++++++errorMessage+%2B=+ex2.ToString();
++++++++++++ex2+=+ex2.InnerException;
++++++++}
++++++++Page.RegisterStartupScript("UserMsg",+"<script>alert('Sending+Failed...');if(alert){+window.location='SendMail.aspx';}</script>");
++++}
}|code-block|syntax|javascript|39441|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try using this code instead. Note: In the "from address" give your correct email id and password.

<pre><code>protected void btn_send_Click(object sender, EventArgs e)
{

 System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
 mail.To.Add("to gmail address");
 mail.From = new MailAddress("from gmail address", "Email head", System.Text.Encoding.UTF8);
 mail.Subject = "This mail is send from asp.net application";
 mail.SubjectEncoding = System.Text.Encoding.UTF8;
 mail.Body = "This is Email Body Text";
 mail.BodyEncoding = System.Text.Encoding.UTF8;
 mail.IsBodyHtml = true;
 mail.Priority = MailPriority.High;
 SmtpClient client = new SmtpClient();
 client.Credentials = new System.Net.NetworkCredential("from gmail address", "your gmail account password");
 client.Port = 587;
 client.Host = "smtp.gmail.com";
 client.EnableSsl = true;
 try
 {
 client.Send(mail);
 Page.RegisterStartupScript("UserMsg", "&lt;script&gt;alert('Successfully Send...');if(alert){ window.location='SendMail.aspx';}&lt;/script&gt;");
 }
 catch (Exception ex)
 {
 Exception ex2 = ex;
 string errorMessage = string.Empty;
 while (ex2 != null)
 {
 errorMessage += ex2.ToString();
 ex2 = ex2.InnerException;
 }
 Page.RegisterStartupScript("UserMsg", "&lt;script&gt;alert('Sending Failed...');if(alert){ window.location='SendMail.aspx';}&lt;/script&gt;");
 }
}
</code></pre>

blocks|key|256213|text|尝试以下操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|256214|try
{
++++var+fromEmailAddress+=++ConfigurationManager.AppSettings["FromEmailAddress"].ToString();
++++var+fromEmailDisplayName+=+ConfigurationManager.AppSettings["FromEmailDisplayName"].ToString();
++++var+fromEmailPassword+=+ConfigurationManager.AppSettings["FromEmailPassword"].ToString();
++++var+smtpHost+=+ConfigurationManager.AppSettings["SMTPHost"].ToString();
++++var+smtpPort+=+ConfigurationManager.AppSettings["SMTPPort"].ToString();

++++string+body+=+"Your+registration+has+been+done+successfully.+Thank+you.";
++++MailMessage+message+=+new+MailMessage(new+MailAddress(fromEmailAddress,+fromEmailDisplayName),+new+MailAddress(ud.LoginId,+ud.FullName));
++++message.Subject+=+"Thank+You+For+Your+Registration";
++++message.IsBodyHtml+=+true;
++++message.Body+=+body;

++++var+client+=+new+SmtpClient();
++++client.Credentials+=+new+NetworkCredential(fromEmailAddress,+fromEmailPassword);
++++client.Host+=+smtpHost;
++++client.EnableSsl+=+true;
++++client.Port+=+!string.IsNullOrEmpty(smtpPort)+?+Convert.ToInt32(smtpPort)+:+0;
++++client.Send(message);
}
catch+(Exception+ex)
{
++++throw+(new+Exception("Mail+send+failed+to+loginId+"+%2B+ud.LoginId+%2B+",+though+registration+done."));
}|code-block|syntax|javascript|256215|然后在您的web.config中，在中间添加以下内容|256216|
<add+key="FromEmailAddress"+value="sender+emailaddress"/>
<add+key="FromEmailDisplayName"+value="Display+Name"/>
<add+key="FromEmailPassword"+value="sender+Password"/>
<add+key="SMTPHost"+value="smtp-proxy.tm.net.my"/>
<add+key="SMTPPort"+value="smptp+Port"/>|256217|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Try the following : 

<pre><code>try
{
 var fromEmailAddress = ConfigurationManager.AppSettings["FromEmailAddress"].ToString();
 var fromEmailDisplayName = ConfigurationManager.AppSettings["FromEmailDisplayName"].ToString();
 var fromEmailPassword = ConfigurationManager.AppSettings["FromEmailPassword"].ToString();
 var smtpHost = ConfigurationManager.AppSettings["SMTPHost"].ToString();
 var smtpPort = ConfigurationManager.AppSettings["SMTPPort"].ToString();

 string body = "Your registration has been done successfully. Thank you.";
 MailMessage message = new MailMessage(new MailAddress(fromEmailAddress, fromEmailDisplayName), new MailAddress(ud.LoginId, ud.FullName));
 message.Subject = "Thank You For Your Registration";
 message.IsBodyHtml = true;
 message.Body = body;

 var client = new SmtpClient();
 client.Credentials = new NetworkCredential(fromEmailAddress, fromEmailPassword);
 client.Host = smtpHost;
 client.EnableSsl = true;
 client.Port = !string.IsNullOrEmpty(smtpPort) ? Convert.ToInt32(smtpPort) : 0;
 client.Send(message);
}
catch (Exception ex)
{
 throw (new Exception("Mail send failed to loginId " + ud.LoginId + ", though registration done."));
}
</code></pre>

And then in you web.config add the following in between 

<pre><code>&lt;!--Email Config--&gt;
&lt;add key="FromEmailAddress" value="sender emailaddress"/&gt;
&lt;add key="FromEmailDisplayName" value="Display Name"/&gt;
&lt;add key="FromEmailPassword" value="sender Password"/&gt;
&lt;add key="SMTPHost" value="smtp-proxy.tm.net.my"/&gt;
&lt;add key="SMTPPort" value="smptp Port"/&gt;
</code></pre>

blocks|key|256241|text|看看这个..。它起作用了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|256242|http://www.aspnettutorials.com/tutorials/email/email-aspnet2-csharp/|offset|length|256243|using+System;
using+System.Data;
using+System.Configuration;
using+System.Web;
using+System.Web.Security;
using+System.Web.UI;
using+System.Web.UI.WebControls;
using+System.Web.UI.WebControls.WebParts;
using+System.Web.UI.HtmlControls;
using+System.Net.Mail;

public+partial+class+_Default+:+System.Web.UI.Page
{
++++protected+void+Page_Load(object+sender,+EventArgs+e)
++++{

++++}

++++protected+void+btnSubmit_Click(object+sender,+EventArgs+e)
++++{
++++++++try
++++++++{
++++++++++++MailMessage+message+=+new+MailMessage(txtFrom.Text,+txtTo.Text,+txtSubject.Text,+txtBody.Text);
++++++++++++SmtpClient+emailClient+=+new+SmtpClient(txtSMTPServer.Text);
++++++++++++emailClient.Send(message);
++++++++++++litStatus.Text+=+"Message+Sent";
++++++++}
++++++++catch+(Exception+ex)
++++++++{
++++++++++++litStatus.Text=ex.ToString();
++++++++}
++++}
}|code-block|syntax|javascript|256244|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1W|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|H|7|W|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|C]]]]

Check this out .... it works

<a href="http://www.aspnettutorials.com/tutorials/email/email-aspnet2-csharp/" rel="nofollow">http://www.aspnettutorials.com/tutorials/email/email-aspnet2-csharp/</a>

<pre><code>using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mail;

public partial class _Default : System.Web.UI.Page
{
 protected void Page_Load(object sender, EventArgs e)
 {

 }

 protected void btnSubmit_Click(object sender, EventArgs e)
 {
 try
 {
 MailMessage message = new MailMessage(txtFrom.Text, txtTo.Text, txtSubject.Text, txtBody.Text);
 SmtpClient emailClient = new SmtpClient(txtSMTPServer.Text);
 emailClient.Send(message);
 litStatus.Text = "Message Sent";
 }
 catch (Exception ex)
 {
 litStatus.Text=ex.ToString();
 }
 }
}
</code></pre>

blocks|key|39514|text|MailMessage+mm+=+new+MailMessage(txtEmail.Text,+txtTo.Text);
mm.Subject+=+txtSubject.Text;
mm.Body+=+txtBody.Text;
if+(fuAttachment.HasFile)//file+upload+select+or+not
{
++++string+FileName+=+Path.GetFileName(fuAttachment.PostedFile.FileName);
++++mm.Attachments.Add(new+Attachment(fuAttachment.PostedFile.InputStream,+FileName));
}
mm.IsBodyHtml+=+false;
SmtpClient+smtp+=+new+SmtpClient();
smtp.Host+=+"smtp.gmail.com";
smtp.EnableSsl+=+true;
NetworkCredential+NetworkCred+=+new+NetworkCredential(txtEmail.Text,+txtPassword.Text);
smtp.UseDefaultCredentials+=+true;
smtp.Credentials+=+NetworkCred;
smtp.Port+=+587;
smtp.Send(mm);
Response.write("Send+Mail");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|39515|查看视频：https://www.youtube.com/watch?v=bUUNv-19QAI|unstyled|offset|length|39516|entityMap|0|LINK|mutability|MUTABLE|url|https://www.youtube.com/watch?v=bUUNv-19QAI^0|0|5|17|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>MailMessage mm = new MailMessage(txtEmail.Text, txtTo.Text);
mm.Subject = txtSubject.Text;
mm.Body = txtBody.Text;
if (fuAttachment.HasFile)//file upload select or not
{
 string FileName = Path.GetFileName(fuAttachment.PostedFile.FileName);
 mm.Attachments.Add(new Attachment(fuAttachment.PostedFile.InputStream, FileName));
}
mm.IsBodyHtml = false;
SmtpClient smtp = new SmtpClient();
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
NetworkCredential NetworkCred = new NetworkCredential(txtEmail.Text, txtPassword.Text);
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 587;
smtp.Send(mm);
Response.write("Send Mail");
</code></pre>

View Video: <a href="https://www.youtube.com/watch?v=bUUNv-19QAI" rel="nofollow noreferrer">https://www.youtube.com/watch?v=bUUNv-19QAI</a>

blocks|key|39537|text|如果你想在razor中生成电子邮件正文，你可以使用Mailzory。此外，您还可以从here下载nuget包。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|39538|//+template+path
var+viewPath+=+Path.Combine("Views/Emails",+"hello.cshtml");
//+read+the+content+of+template+and+pass+it+to+the+Email+constructor
var+template+=+File.ReadAllText(viewPath);

var+email+=+new+Email(template);

//+set+ViewBag+properties
email.ViewBag.Name+=+"Johnny";
email.ViewBag.Content+=+"Mailzory+Is+Funny";

//+send+email
var+task+=+email.SendAsync("mailzory@outlook.com",+"subject");
task.Wait()|code-block|syntax|javascript|39539|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/mirsaeedi/Mailzory|1|https://www.nuget.org/packages/Mailzory/^0|P|8|0|16|4|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

If you want to generate your email bodies in razor, you can use <a href="https://github.com/mirsaeedi/Mailzory" rel="nofollow noreferrer">Mailzory</a>. Also, you can download the nuget package from <a href="https://www.nuget.org/packages/Mailzory/" rel="nofollow noreferrer">here</a>.

<pre><code>// template path
var viewPath = Path.Combine("Views/Emails", "hello.cshtml");
// read the content of template and pass it to the Email constructor
var template = File.ReadAllText(viewPath);

var email = new Email(template);

// set ViewBag properties
email.ViewBag.Name = "Johnny";
email.ViewBag.Content = "Mailzory Is Funny";

// send email
var task = email.SendAsync("mailzory@outlook.com", "subject");
task.Wait()
</code></pre>

blocks|key|39617|text|只需传递像body这样的参数-来自客户的内容(查询)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|39618|subject+-在邮件主题中定义的主题|39619|用户名-无名称任何内容|39620|邮件-邮件(必填)|39621|+++public+static+bool+SendMail(String+body,+String+subject,+string+username,+String+mail)
++++{
++++++++bool+isSendSuccess+=+false;
++++++++try
++++++++{
++++++++++++var+fromEmailAddress+=+ConfigurationManager.AppSettings["FromEmailAddress"].ToString();
++++++++++++var+fromEmailDisplayName+=+ConfigurationManager.AppSettings["FromEmailDisplayName"].ToString();
++++++++++++var+fromEmailPassword+=+ConfigurationManager.AppSettings["FromEmailPassword"].ToString();
++++++++++++var+smtpHost+=+ConfigurationManager.AppSettings["SMTPHost"].ToString();
++++++++++++var+smtpPort+=+ConfigurationManager.AppSettings["SMTPPort"].ToString();


++++++++++++MailMessage+message+=+new+MailMessage(new+MailAddress(fromEmailAddress,+fromEmailDisplayName),
++++++++++++++++new+MailAddress(mail,+username));
++++++++++++message.Subject+=+subject;
++++++++++++message.IsBodyHtml+=+true;
++++++++++++message.Body+=+body;

++++++++++++var+client+=+new+SmtpClient();
++++++++++++client.UseDefaultCredentials+=+false;
++++++++++++client.Credentials+=+new+NetworkCredential(fromEmailAddress,+fromEmailPassword);
++++++++++++client.Host+=+smtpHost;
++++++++++++client.EnableSsl+=+false;
++++++++++++client.Port+=+!string.IsNullOrEmpty(smtpPort)+?+Convert.ToInt32(smtpPort)+:+0;
++++++++++++client.Send(message);
++++++++++++isSendSuccess+=+true;
++++++++}
++++++++catch+(Exception+ex)
++++++++{
++++++++++++throw+(new+Exception("Mail+send+failed+to+loginId+"+%2B+mail+%2B+",+though+registration+done."%2Bex.ToString()%2B"\n"%2Bex.StackTrace));
++++++++}

++++++++return+isSendSuccess;
++++}|code-block|syntax|javascript|39622|如果你使用go爸爸服务器，这个工作。在web.config中添加此内容|39623|++<appSettings>
++++---other+---setting

++++<add+key="FromEmailAddress"+value="myemail@gmail.com"+/>
++++<add+key="FromEmailDisplayName"+value="anyname"+/>
++++<add+key="FromEmailPassword"+value="mypassword@"+/>
++++<add+key="SMTPHost"+value="relay-hosting.secureserver.net"+/>
++++<add+key="SMTPPort"+value="25"+/>

</appSettings>|39624|如果您使用的是localhost或vps服务器，请将此配置更改为|39625|+<appSettings>
++++---other+---setting

++++<add+key="FromEmailAddress"+value="myemail@gmail.com"+/>
++++<add+key="FromEmailDisplayName"+value="anyname"+/>
++++<add+key="FromEmailPassword"+value="mypassword@"+/>
++++<add+key="SMTPHost"+value="smtp.gmail.com"+/>+
++++<add+key="SMTPPort"+value="587"+/>
</appSettings>|39626|更改代码|39627|++++++++++client.EnableSsl+=+true;|39628|如果您使用的是gmail，请启用安全应用。使用此链接https://myaccount.google.com/lesssecureapps?pli=1&rapt=AEjHL4Pd6h3XxE663Flvd-FfeRXxW_eNrIsGTBlZklgkAHZEeuHvheCQuZ1-djB9uIWaB-2EV7hyLCU0dWKA7D0JzYKe4ZRkuA|offset|length|39629|entityMap|0|LINK|mutability|MUTABLE|url|https://myaccount.google.com/lesssecureapps?pli=1&rapt=AEjHL4Pd6h3XxE663Flvd-FfeRXxW_eNrIsGTBlZklgkAHZEeuHvheCQuZ1-djB9uIWaB-2EV7hyLCU0dWKA7D0JzYKe4ZRkuA^0|0|0|0|0|0|0|0|0|0|0|0|Q|49|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|1C|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|1D|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|1E|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1F|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|1G|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1H|8|@]|9|@]|A|$]]|$1|S|3|T|5|J|7|1I|8|@]|9|@]|A|$K|L]]|$1|U|3|V|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|X|5|J|7|1K|8|@]|9|@]|A|$K|L]]|$1|Y|3|Z|5|6|7|1L|8|@]|9|@$10|1M|11|1N|1|1O]]|A|$]]|$1|12|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]]]

Just pass parameter
like
body - The content(query) from the customer 
subject - subject that defined in mail subject 
username - nothing name anything 
mail - mail (required)
<pre><code> public static bool SendMail(String body, String subject, string username, String mail)
 {
 bool isSendSuccess = false;
 try
 {
 var fromEmailAddress = ConfigurationManager.AppSettings[&quot;FromEmailAddress&quot;].ToString();
 var fromEmailDisplayName = ConfigurationManager.AppSettings[&quot;FromEmailDisplayName&quot;].ToString();
 var fromEmailPassword = ConfigurationManager.AppSettings[&quot;FromEmailPassword&quot;].ToString();
 var smtpHost = ConfigurationManager.AppSettings[&quot;SMTPHost&quot;].ToString();
 var smtpPort = ConfigurationManager.AppSettings[&quot;SMTPPort&quot;].ToString();


 MailMessage message = new MailMessage(new MailAddress(fromEmailAddress, fromEmailDisplayName),
 new MailAddress(mail, username));
 message.Subject = subject;
 message.IsBodyHtml = true;
 message.Body = body;

 var client = new SmtpClient();
 client.UseDefaultCredentials = false;
 client.Credentials = new NetworkCredential(fromEmailAddress, fromEmailPassword);
 client.Host = smtpHost;
 client.EnableSsl = false;
 client.Port = !string.IsNullOrEmpty(smtpPort) ? Convert.ToInt32(smtpPort) : 0;
 client.Send(message);
 isSendSuccess = true;
 }
 catch (Exception ex)
 {
 throw (new Exception(&quot;Mail send failed to loginId &quot; + mail + &quot;, though registration done.&quot;+ex.ToString()+&quot;\n&quot;+ex.StackTrace));
 }

 return isSendSuccess;
 }
</code></pre>
if your using go daddy server this work . add this in web.config 
<pre><code> &lt;appSettings&gt;
 ---other ---setting

 &lt;add key=&quot;FromEmailAddress&quot; value=&quot;myemail@gmail.com&quot; /&gt;
 &lt;add key=&quot;FromEmailDisplayName&quot; value=&quot;anyname&quot; /&gt;
 &lt;add key=&quot;FromEmailPassword&quot; value=&quot;mypassword@&quot; /&gt;
 &lt;add key=&quot;SMTPHost&quot; value=&quot;relay-hosting.secureserver.net&quot; /&gt;
 &lt;add key=&quot;SMTPPort&quot; value=&quot;25&quot; /&gt;

&lt;/appSettings&gt;
</code></pre>
if you are using localhost or vps server change this configuration to this
<pre><code> &lt;appSettings&gt;
 ---other ---setting

 &lt;add key=&quot;FromEmailAddress&quot; value=&quot;myemail@gmail.com&quot; /&gt;
 &lt;add key=&quot;FromEmailDisplayName&quot; value=&quot;anyname&quot; /&gt;
 &lt;add key=&quot;FromEmailPassword&quot; value=&quot;mypassword@&quot; /&gt;
 &lt;add key=&quot;SMTPHost&quot; value=&quot;smtp.gmail.com&quot; /&gt; 
 &lt;add key=&quot;SMTPPort&quot; value=&quot;587&quot; /&gt;
&lt;/appSettings&gt;
</code></pre>
change the code
<pre><code> client.EnableSsl = true;
</code></pre>
if your are using gmail please enable secure app. using this link
<a href="https://myaccount.google.com/lesssecureapps?pli=1&amp;rapt=AEjHL4Pd6h3XxE663Flvd-FfeRXxW_eNrIsGTBlZklgkAHZEeuHvheCQuZ1-djB9uIWaB-2EV7hyLCU0dWKA7D0JzYKe4ZRkuA" rel="nofollow noreferrer">https://myaccount.google.com/lesssecureapps?pli=1&amp;rapt=AEjHL4Pd6h3XxE663Flvd-FfeRXxW_eNrIsGTBlZklgkAHZEeuHvheCQuZ1-djB9uIWaB-2EV7hyLCU0dWKA7D0JzYKe4ZRkuA</a>

blocks|key|256376|text|++++using+System;
++++using+System.Collections.Generic;
++++using+System.Linq;
++++using+System.Web;
++++using+System.Globalization;
++++using+System.Text.RegularExpressions;
++++
++++///+<summary>
++++///+Summary+description+for+RegexUtilities
++++///+</summary>
++++public+class+RegexUtilities
++++{
++++++++bool+InValid+=+false;
++++
++++++++public+bool+IsValidEmail(string+strIn)
++++++++{
++++++++++++InValid+=+false;
++++++++++++if+(String.IsNullOrEmpty(strIn))
++++++++++++++++return+false;
++++
++++++++++++//+Use+IdnMapping+class+to+convert+Unicode+domain+names.
++++++++++++strIn+=+Regex.Replace(strIn,+@"(@)(.%2B)$",+this.DomainMapper);
++++++++++++if+(InValid)
++++++++++++++++return+false;
++++
++++++++++++//+Return+true+if+strIn+is+in+valid+e-mail+format.+
++++++++++++return+Regex.IsMatch(strIn,+@"%5E(?("")(""[%5E""]%2B?""@)%7C(([0-9a-z]((\.(?!\.))%7C[-!#\$%25&'\*\%2B/=\?\%5E`\{\}\%7C~\w])*)(?<=[0-9a-z])@))"+%2B+@"(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])%7C(([0-9a-z][-\w]*[0-9a-z]*\.)%2B[a-z0-9]{2,17}))$",
+++++++++++++++++++RegexOptions.IgnoreCase);
++++++++}
++++
++++++++private+string+DomainMapper(Match+match)
++++++++{
++++++++++++//+IdnMapping+class+with+default+property+values.
++++++++++++IdnMapping+idn+=+new+IdnMapping();
++++
++++++++++++string+domainName+=+match.Groups[2].Value;
++++++++++++try
++++++++++++{
++++++++++++++++domainName+=+idn.GetAscii(domainName);
++++++++++++}
++++++++++++catch+(ArgumentException)
++++++++++++{
++++++++++++++++InValid+=+true;
++++++++++++}
++++++++++++return+match.Groups[1].Value+%2B+domainName;
++++++++}
++++
++++}



+private+void+GetSendEmInfo()
++++{
++++++++#region+For+Get+All+Type+Email+Informations..!!
++++++++IPL.DoId+=+ddlName.SelectedValue;
++++++++DataTable+dt+=+IdBL.GetEmailS(IPL);
++++++++if+(dt.Rows.Count+>+0)
++++++++{
++++++++++++hid_MailId.Value+=+dt.Rows[0]["MailId"].ToString();
++++++++++++hid_UsedPName.Value+=+dt.Rows[0]["UName"].ToString();
++++++++++++hid_EmailSubject.Value+=+dt.Rows[0]["EmailSubject"].ToString();
++++++++++++hid_EmailBody.Value+=+dt.Rows[0]["EmailBody"].ToString();
++++++++++++hid_EmailIdName.Value+=+dt.Rows[0]["EmailIdName"].ToString();
++++++++++++hid_EmPass.Value+=+dt.Rows[0]["EPass"].ToString();
++++++++++++hid_SeName.Value+=+dt.Rows[0]["SenName"].ToString();
++++++++++++hid_TNo.Value+=+dt.Rows[0]["TeNo"].ToString();
++++++++++++hid_EmaLimit.Value+=+dt.Rows[0]["EmailLimit"].ToString();
++++++++++++hidlink.Value+=+dt.Rows[0][link"].ToString();
++++++++}
++++++++#endregion

++++++++#region+For+Set+Some+Local+Variables..!!
++++++++int+StartLmt,+FinalLmt,+SendCurrentMail;
++++++++StartLmt+=+FinalLmt+=+SendCurrentMail+=+0;
++++++++bool+Valid_LimitMail;
++++++++Valid_LimitMail+=+true;
++++++++/**For+Get+Finalize+Limit+For+Send+Mail**/
++++++++FinalLmt+=+Convert.ToInt32(hid_EmailmaxLimit.Value);
++++++++#region+For+Check+Email+Valid+Limits..!!
++++++++if+(FinalLmt+>+0)
++++++++{
++++++++++++Valid_LimitMail+=+true;
++++++++}
++++++++else
++++++++{
++++++++++++Valid_LimitMail+=+false;
++++++++}
++++++++#endregion
++++++++/**For+Get+Finalize+Limit+For+Send+Mail**/
++++++++#endregion

++++++++if+(Valid_LimitMail+==+true)
++++++++{
++++++++++++#region+For+Send+Current+Email+Status..!!
++++++++++++bool+EmaiValid;
++++++++++++string+CreateFileName;
++++++++++++string+retmailflg+=+null;
++++++++++++EmaiValid+=+false;
++++++++++++#endregion

++++++++++++#region+For+Set+Start+Limit+And+FinalLimit+Send+No+Of+Email..!!
++++++++++++mPL.SendDate+=+DateTime.Now.ToString("dd-MMM-yyyy");
++++++++++++DataTable+dtsendEmail+=+m1BL.GetEmailSendLog(mPL);
++++++++++++if+(dtsendEmail.Rows.Count+>+0)
++++++++++++{
++++++++++++++++StartLmt+=+Convert.ToInt32(dtsendEmail.Rows[0]["SendNo_Of_Email"].ToString());
++++++++++++}
++++++++++++else
++++++++++++{
++++++++++++++++StartLmt+=+0;
++++++++++++}
++++++++++++#endregion

++++++++++++#region+For+Find+Grid+View+Controls..!!
++++++++++++for+(int+i+=+0;+i+<+GrdEm.Rows.Count;+i%2B%2B)
++++++++++++{
++++++++++++++++#region+For+Find+Grid+view+Controls..!!
++++++++++++++++CheckBox+Chk_SelectOne+=+(CheckBox)GrdEmp.Rows[i].FindControl("chkSingle");
++++++++++++++++Label+lbl_No+=+(Label)GrdEmAtt.Rows[i].FindControl("lblGrdCode");
++++++++++++++++lblCode.Value+=+lbl_InNo.Text;

++++++++++++++++Label+lbl_EmailId+=+(Label)GrdEomAtt.Rows[i].FindControl("lblGrdEmpEmail");

++++++++++++++++#endregion

++++++++++++++++/**Region+For+If+Check+Box+Checked+Then**/
++++++++++++++++if+(Chk_SelectOne.Checked+==+true)
++++++++++++++++{
++++++++++++++++++++if+(!string.IsNullOrEmpty(lbl_EmailId.Text))
++++++++++++++++++++{
++++++++++++++++++++++++#region+For+When+Check+Box+Checked..!!
++++++++++++++++++++++++/**If+Start+Limit+Less+Or+Equal+To+Then+Condition+Performs**/
++++++++++++++++++++++++if+(StartLmt+<+FinalLmt)
++++++++++++++++++++++++{
++++++++++++++++++++++++++++StartLmt+=+StartLmt+%2B+1;
++++++++++++++++++++++++}
++++++++++++++++++++++++else
++++++++++++++++++++++++{
++++++++++++++++++++++++++++Valid_LimitMail+=+false;
++++++++++++++++++++++++++++EmaiValid+=+false;
++++++++++++++++++++++++}
++++++++++++++++++++++++/**End+Region**/
++++++++++++++++++++++++string[]+SplitClients_Email+=+lbl_EmailId.Text.Split(',');
++++++++++++++++++++++++string+Send_Email,+Hold_Email;
++++++++++++++++++++++++Send_Email+=+Hold_Email+=+"";

++++++++++++++++++++++++int+CountEmail;/**Region+For+Count+Total+Email**/
++++++++++++++++++++++++CountEmail+=+0;/**First+Time+Email+Counts+Zero**/

++++++++++++++++++++++++Hold_Email+=+SplitClients_Email[0].ToString().Trim().TrimEnd().TrimStart().ToString();
++++++++++++++++++++++++/**Region+For+If+Clients+Have+One+Email**/
++++++++++++++++++++++++#region+For+First+Emails+Send+On+Client..!!
++++++++++++++++++++++++if+(SplitClients_Email[0].ToString()+!=+"")
++++++++++++++++++++++++{
++++++++++++++++++++++++++++if+(EmailRegex.IsValidEmail(Hold_Email))
++++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++Send_Email+=+Hold_Email;
++++++++++++++++++++++++++++++++CountEmail+=+1;
++++++++++++++++++++++++++++++++EmaiValid+=+true;
++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++else
++++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++EmaiValid+=+false;
++++++++++++++++++++++++++++}
++++++++++++++++++++++++}
++++++++++++++++++++++++#endregion
++++++++++++++++++++++++/**Region+For+If+Clients+Have+One+Email**/
++++++++++++++++++++++++/**Region+For+If+Clients+Have+Two+Email**/

++++++++++++++++++++++++/**Region+For+If+Clients+Have+Two+Email**/
++++++++++++++++++++++++if+(EmaiValid+==+true)
++++++++++++++++++++++++{
++++++++++++++++++++++++++++#region+For+Create+Email+Body+And+Create+File+Name..!!
++++++++++++++++++++++++++++//fofile+=+Server.MapPath("PDFs");
++++++++++++++++++++++++++++fofile+=+Server.MapPath("~/vvv/vvvv/")+%2B+"/";
++++++++++++++++++++++++++++CreateFileName+=+lbl_INo.Text.ToString()+%2B+"_1"+%2B+".Pdf";/**Create+File+Name**/
++++++++++++++++++++++++++++string[]+orimail+=+Send_Email.Split(',');
++++++++++++++++++++++++++++string+Billbody,+TempInvoiceId;
++++++++++++++++++++++++++++//+DateTime+dtLstdate+=+new+DateTime(Convert.ToInt32(txtYear.Text),+Convert.ToInt32(ddlMonth.SelectedValue),+16);

++++++++++++++++++++++++++++//++DateTime+IndtLmt+=+dtLstdate.AddMonths(1);
++++++++++++++++++++++++++++TempInvoiceId+=+"";

++++++++++++++++++++++++++++//byte[]+Buffer+=+Encrypt.Encryptiondata(lbl_InvoiceNo.Text.ToString());
++++++++++++++++++++++++++++//TempInvoiceId+=+Convert.ToBase64String(Buffer);


++++++++++++++++++++++++++++#region+Create+Encrypted+Path


++++++++++++++++++++++++++++byte[]+EncCode+=+Encrypt.Encryptiondata(lbl_INo.Text);
++++++++++++++++++++++++++++hidEncrypteCode.Value+=+Convert.ToBase64String(EncECode);
++++++++++++++++++++++++++++#endregion

++++++++++++++++++++++++

++++++++++++++++++++++++++++//#region+Create+Email+Body+!!
++++++++++++++++++++++++++++//body+=+hid_EmailBody.Value.Replace("@greeting",+lbl_CoName.Text).Replace("@free",+hid_ToNo.Value).Replace("@llnk",+"<a+style='font-family:+Tahoma;+font-size:+10pt;+color:+#800000;+font-weight:+bold'+href='http://1ccccc/ccc/ccc/ccc.aspx?EC="+%2B+hidEncryptedCode.Value%2B+"'+>+C+cccccccc+</a>");
++++++++++++++++++++++++++

++++++++++++++++++++++++++++body+=+hid_EmailBody.Value.Replace("@greeting",+"Hii").Replace("@No",+hid_No.Value);/*For+Mail*/
++++++++++++++++++++++++++++//#endregion



++++++++++++++++++++++++++++#region+For+Email+Sender+Informations..!!
++++++++++++++++++++++++++++for+(int+j+=+0;+j+<+CountEmail;+j%2B%2B)
++++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++//if+(File.Exists(fofile+%2B+"\\"+%2B+CreateFileName))
++++++++++++++++++++++++++++++++//{
++++++++++++++++++++++++++++++++#region
++++++++++++++++++++++++++++++++lbl_EmailId.Text+=+orimail[j];
++++++++++++++++++++++++++++++++retmailflg+=+"";

++++++++++++++++++++++++++++++++/**Region+For+Send+Email+For+Clients**/
++++++++++++++++++++++++++++++++//retmailflg+=+SendPreMail("Wp+From+"+%2B+lbl_CName.Text+%2B+"",+body,+lbl_EmailId.Text,+lbl_IeNo.Text,+hid_EmailIdName.Value,+hid_EmailPassword.Value);
++++++++++++++++++++++++++++++++retmailflg+=+SendPreMail(hid_EmailSubject.Value,+Body,+lbl_EmailId.Text,+lbl_No.Text,+hid_EmailIdName.Value,+hid_EmailPassword.Value);
++++++++++++++++++++++++++++++++/**End+Region**/

++++++++++++++++++++++++++++++++/**Region+For+Create+Send+Email+Log++When+Email+Send+Successfully**/
++++++++++++++++++++++++++++++++if+(retmailflg+==+"True")
++++++++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++++++SendCurrentMail+=+Convert.ToInt32(SendCurrentMail)+%2B+1;
++++++++++++++++++++++++++++++++++++StartLmt+=+Convert.ToInt32(StartLmt)+%2B+1;

++++++++++++++++++++++++++++++++++++if+(SendCurrentMail+>+0)
++++++++++++++++++++++++++++++++++++{
++++++++++++++++++++++++++++++++++++++++CreateEmailLog(lbl_InNo.Text,+StartLmt,+hid_EmailIdName.Value,+lbl_EmailId.Text);
++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++++++

++++++++++++++++++++++++++++++++/**End+Region**/
++++++++++++++++++++++++++++++++#endregion
++++++++++++++++++++++++++++++++//}
++++++++++++++++++++++++++++}
++++++++++++++++++++++++++++#endregion
++++++++++++++++++++++++}
++++++++++++++++++++++++#endregion
++++++++++++++++++++}
++++++++++++++++}
++++++++++++++++/**End+Region**/
++++++++++++}
++++++++++++#endregion

++++++++}
+++++++
++++}
++++private+void+CreateEmailLog(string+UniqueId,+int+StartLmt,+string+FromEmailId,+string+TotxtEmailId)
++++{
++++++++FPL.EmailId_From+=+FromEmailId;
++++++++FPL.To_EmailId+=+TotxtEmailId;
++++++++FPL.SendDate+=+DateTime.Now.ToString("dd-MMM-yyyy");
++++++++FPL.EmailUniqueId+=+UniqueId;
++++++++FPL.SendNo_Of_Email+=+StartLmt.ToString();
++++++++FPL.LoginUserId+=+Session["LoginUserId"].ToString();
++++++++int+i+=+FBL.InsertEmaDoc(FPL);
++++}

++++public+string+SendPreMail(string+emsub,+string+embody,+string+EmailId,+string+FileId,+string+EmailFromId,+string+Password)
++++{
++++++++string+retval+=+"False";
++++++++try
++++++++{
++++++++++++string+emailBody,+emailSubject,+emailToList,+emailFrom,
++++++++++++accountPassword,+smtpServer;
++++++++++++bool+enableSSL;
++++++++++++int+port;

++++++++++++emailBody+=+embody;
++++++++++++emailSubject+=+emsub;
++++++++++++emailToList+=+EmailId;
++++++++++++emailFrom+=+EmailFromId;
++++++++++++accountPassword+=+Password;
++++++++++++smtpServer+=+"smtp.gmail.com";
++++++++++++enableSSL+=+true;
++++++++++++port+=+587;

++++++++++++string+crefilename;
++++++++++++string+fofile;
++++++++++++fofile+=+Server.MapPath("PDF");
++++++++++++crefilename+=+FileId+%2B+".Pdf";

++++++++++++string[]+att+=+{+crefilename+};

++++++++++++string+retemail,+insertqry;
++++++++++++retemail+=+"";

++++++++++++retemail+=+SendEmail(emailBody,+emailSubject,+emailFrom,+emailToList,+att,+smtpServer,+enableSSL,+accountPassword,+port);

++++++++++++if+(retemail+==+"True")
++++++++++++{

++++++++++++++++retval+=+retemail;
++++++++++++}
++++++++}
++++++++catch
++++++++{
++++++++++++retval+=+"False";
++++++++}
++++++++finally
++++++++{

++++++++}
++++++++return+retval;
++++}

++++public+string+SendEmail(string+emailBody,+string+emailSubject,+string+emailFrom,+string+emailToList,+string[]+attachedFiles,+string+smtpIPAddress,+bool+enableSSL,+string+accountPassword,+int+port)
++++{
++++++++MailMessage+mail+=+new+MailMessage();
++++++++string+retflg;
++++++++retflg+=+"False";
++++++++try
++++++++{
++++++++++++mail.From+=+new+MailAddress(emailFrom);
++++++++++++if+(emailToList.Contains(";"))
++++++++++++{
++++++++++++++++emailToList+=+emailToList.Replace(";",+",");
++++++++++++}
++++++++++++mail.To.Add(emailToList);

++++++++++++mail.Subject+=+emailSubject;
++++++++++++mail.IsBodyHtml+=+true;
++++++++++++mail.Body+=+emailBody;


++++++++++++SmtpClient+smtp+=+new+SmtpClient();
++++++++++++smtp.Host+=+"smtp.gmail.com";
++++++++++++smtp.EnableSsl+=+true;
++++++++++++NetworkCredential+NetworkCred+=+new+NetworkCredential(emailFrom,+accountPassword);
++++++++++++smtp.UseDefaultCredentials+=+true;
++++++++++++smtp.Credentials+=+NetworkCred;
++++++++++++smtp.Port+=+587;
++++++++++++smtp.Send(mail);
++++++++++++retflg+=+"True";

++++++++}
++++++++catch
++++++++{
++++++++++++retflg+=+"False";
++++++++}
++++++++finally
++++++++{
++++++++++++mail.Dispose();
++++++++}
++++++++return+retflg;
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|256377|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Web;
 using System.Globalization;
 using System.Text.RegularExpressions;
 
 /// &lt;summary&gt;
 /// Summary description for RegexUtilities
 /// &lt;/summary&gt;
 public class RegexUtilities
 {
 bool InValid = false;
 
 public bool IsValidEmail(string strIn)
 {
 InValid = false;
 if (String.IsNullOrEmpty(strIn))
 return false;
 
 // Use IdnMapping class to convert Unicode domain names.
 strIn = Regex.Replace(strIn, @&quot;(@)(.+)$&quot;, this.DomainMapper);
 if (InValid)
 return false;
 
 // Return true if strIn is in valid e-mail format. 
 return Regex.IsMatch(strIn, @&quot;^(?(&quot;&quot;)(&quot;&quot;[^&quot;&quot;]+?&quot;&quot;@)|(([0-9a-z]((\.(?!\.))|[-!#\$%&amp;'\*\+/=\?\^`\{\}\|~\w])*)(?&lt;=[0-9a-z])@))&quot; + @&quot;(?(\[)(\[(\d{1,3}\.){3}\d{1,3}\])|(([0-9a-z][-\w]*[0-9a-z]*\.)+[a-z0-9]{2,17}))$&quot;,
 RegexOptions.IgnoreCase);
 }
 
 private string DomainMapper(Match match)
 {
 // IdnMapping class with default property values.
 IdnMapping idn = new IdnMapping();
 
 string domainName = match.Groups[2].Value;
 try
 {
 domainName = idn.GetAscii(domainName);
 }
 catch (ArgumentException)
 {
 InValid = true;
 }
 return match.Groups[1].Value + domainName;
 }
 
 }



 private void GetSendEmInfo()
 {
 #region For Get All Type Email Informations..!!
 IPL.DoId = ddlName.SelectedValue;
 DataTable dt = IdBL.GetEmailS(IPL);
 if (dt.Rows.Count &gt; 0)
 {
 hid_MailId.Value = dt.Rows[0][&quot;MailId&quot;].ToString();
 hid_UsedPName.Value = dt.Rows[0][&quot;UName&quot;].ToString();
 hid_EmailSubject.Value = dt.Rows[0][&quot;EmailSubject&quot;].ToString();
 hid_EmailBody.Value = dt.Rows[0][&quot;EmailBody&quot;].ToString();
 hid_EmailIdName.Value = dt.Rows[0][&quot;EmailIdName&quot;].ToString();
 hid_EmPass.Value = dt.Rows[0][&quot;EPass&quot;].ToString();
 hid_SeName.Value = dt.Rows[0][&quot;SenName&quot;].ToString();
 hid_TNo.Value = dt.Rows[0][&quot;TeNo&quot;].ToString();
 hid_EmaLimit.Value = dt.Rows[0][&quot;EmailLimit&quot;].ToString();
 hidlink.Value = dt.Rows[0][link&quot;].ToString();
 }
 #endregion

 #region For Set Some Local Variables..!!
 int StartLmt, FinalLmt, SendCurrentMail;
 StartLmt = FinalLmt = SendCurrentMail = 0;
 bool Valid_LimitMail;
 Valid_LimitMail = true;
 /**For Get Finalize Limit For Send Mail**/
 FinalLmt = Convert.ToInt32(hid_EmailmaxLimit.Value);
 #region For Check Email Valid Limits..!!
 if (FinalLmt &gt; 0)
 {
 Valid_LimitMail = true;
 }
 else
 {
 Valid_LimitMail = false;
 }
 #endregion
 /**For Get Finalize Limit For Send Mail**/
 #endregion

 if (Valid_LimitMail == true)
 {
 #region For Send Current Email Status..!!
 bool EmaiValid;
 string CreateFileName;
 string retmailflg = null;
 EmaiValid = false;
 #endregion

 #region For Set Start Limit And FinalLimit Send No Of Email..!!
 mPL.SendDate = DateTime.Now.ToString(&quot;dd-MMM-yyyy&quot;);
 DataTable dtsendEmail = m1BL.GetEmailSendLog(mPL);
 if (dtsendEmail.Rows.Count &gt; 0)
 {
 StartLmt = Convert.ToInt32(dtsendEmail.Rows[0][&quot;SendNo_Of_Email&quot;].ToString());
 }
 else
 {
 StartLmt = 0;
 }
 #endregion

 #region For Find Grid View Controls..!!
 for (int i = 0; i &lt; GrdEm.Rows.Count; i++)
 {
 #region For Find Grid view Controls..!!
 CheckBox Chk_SelectOne = (CheckBox)GrdEmp.Rows[i].FindControl(&quot;chkSingle&quot;);
 Label lbl_No = (Label)GrdEmAtt.Rows[i].FindControl(&quot;lblGrdCode&quot;);
 lblCode.Value = lbl_InNo.Text;

 Label lbl_EmailId = (Label)GrdEomAtt.Rows[i].FindControl(&quot;lblGrdEmpEmail&quot;);

 #endregion

 /**Region For If Check Box Checked Then**/
 if (Chk_SelectOne.Checked == true)
 {
 if (!string.IsNullOrEmpty(lbl_EmailId.Text))
 {
 #region For When Check Box Checked..!!
 /**If Start Limit Less Or Equal To Then Condition Performs**/
 if (StartLmt &lt; FinalLmt)
 {
 StartLmt = StartLmt + 1;
 }
 else
 {
 Valid_LimitMail = false;
 EmaiValid = false;
 }
 /**End Region**/
 string[] SplitClients_Email = lbl_EmailId.Text.Split(',');
 string Send_Email, Hold_Email;
 Send_Email = Hold_Email = &quot;&quot;;

 int CountEmail;/**Region For Count Total Email**/
 CountEmail = 0;/**First Time Email Counts Zero**/

 Hold_Email = SplitClients_Email[0].ToString().Trim().TrimEnd().TrimStart().ToString();
 /**Region For If Clients Have One Email**/
 #region For First Emails Send On Client..!!
 if (SplitClients_Email[0].ToString() != &quot;&quot;)
 {
 if (EmailRegex.IsValidEmail(Hold_Email))
 {
 Send_Email = Hold_Email;
 CountEmail = 1;
 EmaiValid = true;
 }
 else
 {
 EmaiValid = false;
 }
 }
 #endregion
 /**Region For If Clients Have One Email**/
 /**Region For If Clients Have Two Email**/

 /**Region For If Clients Have Two Email**/
 if (EmaiValid == true)
 {
 #region For Create Email Body And Create File Name..!!
 //fofile = Server.MapPath(&quot;PDFs&quot;);
 fofile = Server.MapPath(&quot;~/vvv/vvvv/&quot;) + &quot;/&quot;;
 CreateFileName = lbl_INo.Text.ToString() + &quot;_1&quot; + &quot;.Pdf&quot;;/**Create File Name**/
 string[] orimail = Send_Email.Split(',');
 string Billbody, TempInvoiceId;
 // DateTime dtLstdate = new DateTime(Convert.ToInt32(txtYear.Text), Convert.ToInt32(ddlMonth.SelectedValue), 16);

 // DateTime IndtLmt = dtLstdate.AddMonths(1);
 TempInvoiceId = &quot;&quot;;

 //byte[] Buffer = Encrypt.Encryptiondata(lbl_InvoiceNo.Text.ToString());
 //TempInvoiceId = Convert.ToBase64String(Buffer);


 #region Create Encrypted Path


 byte[] EncCode = Encrypt.Encryptiondata(lbl_INo.Text);
 hidEncrypteCode.Value = Convert.ToBase64String(EncECode);
 #endregion

 

 //#region Create Email Body !!
 //body = hid_EmailBody.Value.Replace(&quot;@greeting&quot;, lbl_CoName.Text).Replace(&quot;@free&quot;, hid_ToNo.Value).Replace(&quot;@llnk&quot;, &quot;&lt;a style='font-family: Tahoma; font-size: 10pt; color: #800000; font-weight: bold' href='http://1ccccc/ccc/ccc/ccc.aspx?EC=&quot; + hidEncryptedCode.Value+ &quot;' &gt; C cccccccc &lt;/a&gt;&quot;);
 

 body = hid_EmailBody.Value.Replace(&quot;@greeting&quot;, &quot;Hii&quot;).Replace(&quot;@No&quot;, hid_No.Value);/*For Mail*/
 //#endregion



 #region For Email Sender Informations..!!
 for (int j = 0; j &lt; CountEmail; j++)
 {
 //if (File.Exists(fofile + &quot;\\&quot; + CreateFileName))
 //{
 #region
 lbl_EmailId.Text = orimail[j];
 retmailflg = &quot;&quot;;

 /**Region For Send Email For Clients**/
 //retmailflg = SendPreMail(&quot;Wp From &quot; + lbl_CName.Text + &quot;&quot;, body, lbl_EmailId.Text, lbl_IeNo.Text, hid_EmailIdName.Value, hid_EmailPassword.Value);
 retmailflg = SendPreMail(hid_EmailSubject.Value, Body, lbl_EmailId.Text, lbl_No.Text, hid_EmailIdName.Value, hid_EmailPassword.Value);
 /**End Region**/

 /**Region For Create Send Email Log When Email Send Successfully**/
 if (retmailflg == &quot;True&quot;)
 {
 SendCurrentMail = Convert.ToInt32(SendCurrentMail) + 1;
 StartLmt = Convert.ToInt32(StartLmt) + 1;

 if (SendCurrentMail &gt; 0)
 {
 CreateEmailLog(lbl_InNo.Text, StartLmt, hid_EmailIdName.Value, lbl_EmailId.Text);
 
 }
 }
 

 /**End Region**/
 #endregion
 //}
 }
 #endregion
 }
 #endregion
 }
 }
 /**End Region**/
 }
 #endregion

 }
 
 }
 private void CreateEmailLog(string UniqueId, int StartLmt, string FromEmailId, string TotxtEmailId)
 {
 FPL.EmailId_From = FromEmailId;
 FPL.To_EmailId = TotxtEmailId;
 FPL.SendDate = DateTime.Now.ToString(&quot;dd-MMM-yyyy&quot;);
 FPL.EmailUniqueId = UniqueId;
 FPL.SendNo_Of_Email = StartLmt.ToString();
 FPL.LoginUserId = Session[&quot;LoginUserId&quot;].ToString();
 int i = FBL.InsertEmaDoc(FPL);
 }

 public string SendPreMail(string emsub, string embody, string EmailId, string FileId, string EmailFromId, string Password)
 {
 string retval = &quot;False&quot;;
 try
 {
 string emailBody, emailSubject, emailToList, emailFrom,
 accountPassword, smtpServer;
 bool enableSSL;
 int port;

 emailBody = embody;
 emailSubject = emsub;
 emailToList = EmailId;
 emailFrom = EmailFromId;
 accountPassword = Password;
 smtpServer = &quot;smtp.gmail.com&quot;;
 enableSSL = true;
 port = 587;

 string crefilename;
 string fofile;
 fofile = Server.MapPath(&quot;PDF&quot;);
 crefilename = FileId + &quot;.Pdf&quot;;

 string[] att = { crefilename };

 string retemail, insertqry;
 retemail = &quot;&quot;;

 retemail = SendEmail(emailBody, emailSubject, emailFrom, emailToList, att, smtpServer, enableSSL, accountPassword, port);

 if (retemail == &quot;True&quot;)
 {

 retval = retemail;
 }
 }
 catch
 {
 retval = &quot;False&quot;;
 }
 finally
 {

 }
 return retval;
 }

 public string SendEmail(string emailBody, string emailSubject, string emailFrom, string emailToList, string[] attachedFiles, string smtpIPAddress, bool enableSSL, string accountPassword, int port)
 {
 MailMessage mail = new MailMessage();
 string retflg;
 retflg = &quot;False&quot;;
 try
 {
 mail.From = new MailAddress(emailFrom);
 if (emailToList.Contains(&quot;;&quot;))
 {
 emailToList = emailToList.Replace(&quot;;&quot;, &quot;,&quot;);
 }
 mail.To.Add(emailToList);

 mail.Subject = emailSubject;
 mail.IsBodyHtml = true;
 mail.Body = emailBody;


 SmtpClient smtp = new SmtpClient();
 smtp.Host = &quot;smtp.gmail.com&quot;;
 smtp.EnableSsl = true;
 NetworkCredential NetworkCred = new NetworkCredential(emailFrom, accountPassword);
 smtp.UseDefaultCredentials = true;
 smtp.Credentials = NetworkCred;
 smtp.Port = 587;
 smtp.Send(mail);
 retflg = &quot;True&quot;;

 }
 catch
 {
 retflg = &quot;False&quot;;
 }
 finally
 {
 mail.Dispose();
 }
 return retflg;
 }
</code></pre>

I'm very new to the <a href="http://en.wikipedia.org/wiki/ASP.NET" rel="noreferrer">ASP.NET</a> C# area. I'm planning to send a mail through ASP.NET C# and this is the <a href="http://en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol" rel="noreferrer">SMTP</a> address from my <a href="http://en.wikipedia.org/wiki/Internet_service_provider" rel="noreferrer">ISP</a>: 

<pre><code>smtp-proxy.tm.net.my
</code></pre>

Below is what I tried to do, but failed.

<pre><code>&lt;%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="SendMail" %&gt;
&lt;html&gt;
&lt;head id="Head1" runat="server"&gt;&lt;title&gt;Email Test Page&lt;/title&gt;&lt;/head&gt;
&lt;body&gt;
 &lt;form id="form1" runat="server"&gt;
 Message to: &lt;asp:TextBox ID="txtTo" runat="server" /&gt;&lt;br&gt;
 Message from: &lt;asp:TextBox ID="txtFrom" runat="server" /&gt;&lt;br&gt;
 Subject: &lt;asp:TextBox ID="txtSubject" runat="server" /&gt;&lt;br&gt;
 Message Body:&lt;br&gt;
 &lt;asp:TextBox ID="txtBody" runat="server" Height="171px" TextMode="MultiLine" Width="270px" /&gt;&lt;br&gt;
 &lt;asp:Button ID="Btn_SendMail" runat="server" onclick="Btn_SendMail_Click" Text="Send Email" /&gt;&lt;br&gt;
 &lt;asp:Label ID="Label1" runat="server" Text="Label"&gt;&lt;/asp:Label&gt;
 &lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

And below is my <a href="http://en.wikipedia.org/wiki/ASP.NET#Code-behind_solutions" rel="noreferrer">code-behind</a>:

<pre><code>using System;
using System.Web.UI.WebControls;
using System.Net.Mail;
public partial class SendMail : System.Web.UI.Page
{
 protected void Btn_SendMail_Click(object sender, EventArgs e)
 {
 MailMessage mailObj = new MailMessage(
 txtFrom.Text, txtTo.Text, txtSubject.Text, txtBody.Text);
 SmtpClient SMTPServer = new SmtpClient("127.0.0.1");
 try
 {
 SMTPServer.Send(mailObj);
 }
 catch (Exception ex)
 {
 Label1.Text = ex.ToString();
 }
 }
}
</code></pre>

PS: I'm sorry that I couldn't understand the receiver/sender SMTP concept, and so I am trying to understand the whole concept from here.

How to send email in ASP.NET C#

我对 C#专区非常陌生。我计划通过ASP.NET C#发送一封邮件，这是来自我的的地址：smtp-proxy.tm.net.my下面是我想要做的，但是失败了。<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits...

问如何在ASP.NET C#中发送电子邮件
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