Error While Trying to send mail From Winform Application using Yahoo smtp settings

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C#2.0

C#

Hi,

I am trying to send email from my winform application.
I am using System.Web.mail NameSpace for this an am using MailMessage and SmtpClient classes.

I am using smtp settings of yahoo but it is not working(Same Error Comes for rediffmail).

System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
System.Net.NetworkCredential cred = new System.Net.NetworkCredential(txtFrom.Text, txtPassword.Text);
mail.To.Add(txtTo.Text);
mail.Subject = "Test Mail";
mail.From = new System.Net.Mail.MailAddress(txtFrom.Text);
mail.IsBodyHtml = true;
mail.Body = "This Mail Is A Test Mail";
if (txtAttachFile.Text != "")
{
 System.Net.Mail.Attachment attach = new                                            System.Net.Mail.Attachment(txtAttachFile.Text);
          mail.Attachments.Add(attach);
}
System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient("smtp.mail.yahoo.com");
smtp.UseDefaultCredentials = false;
smtp.EnableSsl = true;
smtp.Credentials = cred;
smtp.Port = 465;
smtp.Send(mail);