问从页面中插入表单提交失败

EN

public partial class UploadBooks : System.Web.UI.Page
{

string strcon = WebConfigurationManager.ConnectionStrings["StudentConnectionString1"].ConnectionString;

protected void Page_Load(object sender, EventArgs e)
{
    // add session name
    //Label3.Text = Session["StudFirstName"].ToString();
}
protected void Button1_Click(object sender, EventArgs e)
{
    // image uploading
    if (FileUpload1.HasFile)
    {
        try
        {
            if (FileUpload1.PostedFile.ContentType == "image/jpeg")
            {
                if (FileUpload1.PostedFile.ContentLength < 102400)
                {
                    string filename = Path.GetFileName(FileUpload1.FileName);
                    FileUpload1.SaveAs(Server.MapPath("~/Uploads") + filename);
                    Label2.Text = "Upload status: File uploaded!";
                }
                else
                    Label2.Text = "Upload status: The file has to be less than 100 kb!";
            }
            else
                Label2.Text = "Upload status: Only JPEG files are accepted!";
        }
        catch (Exception ex)
        {
            Label2.Text = "Upload status: The file could not be uploaded. The following error occured: " + ex.Message;
        }
    }
    {

        SqlConnection con = new SqlConnection(strcon);
        SqlCommand cmd = new SqlCommand("Insert into Books (StudId,BookId,Title,Author,Description,Price,Owner,Phone_no,ImagePath) values (@sid,@bid,@t,@a,@d,@p,@o,@n,@i)", con);
        cmd.Parameters.AddWithValue("@sid", Label4.Text);
        cmd.Parameters.AddWithValue("@bid", Label1.Text);
        cmd.Parameters.AddWithValue("@t", TextBox1.Text);
        cmd.Parameters.AddWithValue("@a", TextBox2.Text);
        cmd.Parameters.AddWithValue("@d", TextBox3.Text);
        cmd.Parameters.AddWithValue("@p", TextBox6.Text);
        cmd.Parameters.AddWithValue("@o", TextBox4.Text);
        cmd.Parameters.AddWithValue("@n", TextBox5.Text);
        cmd.Parameters.AddWithValue("@i", FileUpload1.FileName);
        con.Open();
        cmd.ExecuteNonQuery();
        con.Close();
        Response.Write("1 Book Added");
    }


}
}