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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......!
Posted 14-Dec-12 0:56am
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

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Solution 1

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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