blocks|key|3270373|text|您的目标可能是System.Web.dll不可用的客户端配置文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3270374|您可以在项目的属性中定位完整的框架。|3270375|entityMap^0|7|E|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

You're probably targeting the Client Profile, in which <code>System.Web.dll</code> is not available.

You can target the full framework in project's Properties.

blocks|key|314891|text|您需要添加System.Web引用；|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|314892|右键单击Solution+Explorer|314893|Choose+"Add+Reference"|unordered-list-item|314894|
|314895|Check“|314896|314897|+".NET”选项卡is+selected.|314898|314899|Search+for中的"Reference“，然后添加"System.Web".|314900|314901|entityMap^0|5|A|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|10|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|11|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|J|7|13|8|@]|D|@]|E|$]]|$1|O|3|L|5|6|7|14|8|@]|D|@]|E|$]]|$1|P|3|Q|5|J|7|15|8|@]|D|@]|E|$]]|$1|R|3|L|5|6|7|16|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|17|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|18|8|@]|D|@]|E|$]]|$1|V|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|W|$]]

You need to add the <code>System.Web</code> reference; 

<ol>
<li>Right click the "Reference" in the Solution Explorer</li>
<li>Choose "Add Reference"</li>
<li>Check the ".NET" tab is selected.</li>
<li>Search for, and add "System.Web".</li>
</ol>

blocks|key|313883|text|SLaks有正确的答案...但让我说得更具体一些，像我这样的人，他们对此感到恼火，无法立即找到它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|313884|项目框架属性->应用程序->目标框架->选择".Net框架4“|313885|然后，项目将保存并重新加载。|313886|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

SLaks has the right answer... but let me be a bit more specific for people, like me, who are annoyed by this and can't find it right away :

Project -> Properties -> Application -> Target Framework -> select ".Net Framework 4"

the project will then save and reload.

blocks|key|3057134|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3057135|要解决此问题，请转到以下路径|blockquote|3057136|3057137|Project-->Properties-->Application-->TargetFramework|3057138|并将框架更改为".NET框架4“。|3057139|执行此操作后，项目将关闭并重新打开。|3057140|这应该可以解决这个错误|3057141|3057142|(但由于某种原因，@Karan+Modi的答案没有...)|3057143|接下来，右击解决方案资源管理器中的“引用”选项卡，然后选择“添加引用”。|3057144|选择"System.Web“|3057145|(通过“使用System.Web;”直接声明名称空间似乎不是enough...you必须将其添加到解决方案资源管理器中...我不明白为什么-这并不奇怪，因为我是一名cobol程序员……|3057146|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|X|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|Y|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|Z|7|@]|8|@]|9|$]]|$1|E|3|F|4|5|6|10|7|@]|8|@]|9|$]]|$1|G|3|H|4|5|6|11|7|@]|8|@]|9|$]]|$1|I|3|J|4|5|6|12|7|@]|8|@]|9|$]]|$1|K|3|L|4|5|6|13|7|@]|8|@]|9|$]]|$1|M|3|-4|4|5|6|14|7|@]|8|@]|9|$]]|$1|N|3|O|4|5|6|15|7|@]|8|@]|9|$]]|$1|P|3|Q|4|5|6|16|7|@]|8|@]|9|$]]|$1|R|3|S|4|5|6|17|7|@]|8|@]|9|$]]|$1|T|3|U|4|5|6|18|7|@]|8|@]|9|$]]|$1|V|3|-4|4|5|6|19|7|@]|8|@]|9|$]]]|W|$]]

<blockquote>
 In order to resolve this, Kindly go to the below path
 
 Project-->Properties-->Application-->TargetFramework
 
 and change the Framework to ".NET Framework 4".
 
 Once you do this, the project will close and re-open.
 
 This should solve the error 
</blockquote>

(but for some reason @Karan Modi's answer does not...)

next right-click the references tab in the solution explorer and choose add reference,

choose "System.Web"

(declaring the namespace directly by "using System.Web;" doesnt seems to be enough...you have to add it to the solution explorer...i cant understand why - which is no surprise because i am a cobol programmer..

blocks|key|313985|text|在遵循上面的答案之后，并做到了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|313986|313987|项目->属性->应用程序->目标框架->选择".Net框架4“|blockquote|313988|313989|313990|它还是不能工作，直到我去|313991|Project+->+Add+Reference|offset|length|style|CODE|313992|并选择了System.web。万事俱备，万事俱备。|313993|entityMap^0|0|0|0|0|0|0|0|O|0|4|A|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|V|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@$L|10|M|11|N|O]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|12|8|@$L|13|M|14|N|O]]|9|@]|A|$]]|$1|R|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|S|$]]

After following the answers above , and did

<blockquote>
 Project -> Properties -> Application -> Target Framework -> select
 ".Net Framework 4"
</blockquote>

It still didn't work until I went to <code>Project -&gt; Add Reference</code> 
And selected <code>System.web</code>.
And everything worked link a charm.

blocks|key|3270533|text|为了解决这个问题，请转到下面的路径|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3270534|Project-->Properties-->Application-->TargetFramework|3270535|并将框架更改为".NET框架4“。|3270536|执行此操作后，项目将关闭并重新打开。|3270537|这应该可以解决这个错误。|3270538|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

In order to resolve this, Kindly go to the below path

Project-->Properties-->Application-->TargetFramework

and change the Framework to ".NET Framework 4".

Once you do this, the project will close and re-open.

This should solve the error.

blocks|key|3270492|text|Agrega+System.web+a+las+referencias+del+proyecto.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3270493|编辑|3270494|根据谷歌翻译，这可以翻译成：|3270495|3270496|将System.Web添加到项目引用中。|blockquote|3270497|3270498|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

Agrega System.web a las referencias del proyecto.

[Edit]

According to Google Translate, this translates to:

<blockquote>
 Add System.Web to the project references.
</blockquote>

blocks|key|317094|text|添加对Sysem.Web.Dll的引用为我做了这件事。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317095|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Adding a reference to Sysem.Web.Dll did it for me.

blocks|key|317020|text|我遇到了同样的问题，我从Microsoft.NET框架中复制了web.dll，然后粘贴到项目的根目录中，然后将dll引用添加到应用程序中，它起作用了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317021|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had the same problem what I did, I copied web.dll from Microsoft.NET framework, then paste in root of project, then add dll refrence to app, it worked

blocks|key|315003|text|它是通过以下过程实现的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|315004|添加引用：|315005|system.net
system.web|code-block|syntax|javascript|315006|此外，还应包括名称空间|315007|using+system.net
using+system.web|315008|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

It worked for by following process:

Add Reference:

<pre><code>system.net
system.web
</code></pre>

also, include the namespace

<pre><code>using system.net
using system.web
</code></pre>

I get this error when compiling a C# application. Looks like a trivial error, but I can't get around it.

My setup is Windows 7 64 bit. Visual-Studio 2010 C# express B2Rel.

I added a reference to System.Web.dll located at <code>C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0</code>, but it has a yellow exclamation symbol and I still get the above error. I also have the <code>using System.Web</code> declaration.

What am I doing wrong?

<hr>

Update: After getting the prompt answer pointing me at the root cause, I searched a bit in Google to where it states that System.Web.dll is for the full framework. I did not find such a reference. 
For newbies like me, <a href="http://blogs.msdn.com/jgoldb/archive/2009/10/19/what-s-new-in-net-framework-4-client-profile-beta-2.aspx" rel="noreferrer">this</a> blog summarizes the difference between the frameworks (client and full) nicely. I could not find a spot that says whether a certain Dll is supported in the client framework or not. I guess the exclamation mark in Visual Studio should be the first signal...

HttpUtility does not exist in the current context

Visual Studio

Windows

在编译C#应用程序时，我遇到了这个错误。看起来是个小错误，但我无法绕过它。我的设置是64位Windows 7。Visual-Studio2010 C# express B2Rel。我在C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0添加了一个对System.Web.dll的引用，但是

问当前上下文中不存在HttpUtility
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