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In my asp page i write this code for sending mail

protected void Btn_SendMail_Click(object sender, EventArgs e)

        MailMessage mail = new MailMessage();
        //mail.To.Add("Another Email ID where you wanna send same email");
        mail.From = new MailAddress("");
        mail.Subject = txtSubject.Text;
        mail.Body = txtBody.Text;
        mail.IsBodyHtml = true;
        SmtpClient smtp = new SmtpClient();
        smtp.Host = ""; //Or Your SMTP Server Address
        smtp.Credentials = new System.Net.NetworkCredential("", "abcd123");
        smtp.EnableSsl = true;
        Label1.Text = "Sent Successfully...";

<title>Test </title>
<td> USERName: </td>
<td>Password </td>


But i got this error "
A potentially dangerous Request.Form value was detected from the client (txtBody="<html>
Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. You can disable request validation by setting validateRequest=false in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case.

Exception Details: System.Web.HttpRequestValidationException: A potentially dangerous Request.Form value was detected from the client (txtBody="<html>


please some one help me......!
FehPorto 14-Dec-12 7:05am
you got to send a test email? Without taking the html, just the same text
example: Mail.Body = "This email was sent."

1 solution

The error is caused by having html in your text box.

In the page directivesin the ASPX page add the following

For .Net 4.0 you may also need to make a change in your web config
<httpruntime requestvalidationmode="2.0" />

Have a look here too[^]
Pyledriver 9-Jan-13 3:01am
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