How do i send an e-mail using yahoo in C# appliction?

[skarahman]

I try a lot. Here is my code.

MailMessage mail = new MailMessage();
mail.To = "[e-mail]"; // put to address here
mail.From = "[e-mail]"; // put the from address here
mail.Subject = "TEST MAIL"; // put subject here
mail.Body = "TEST MAIL"; // put body of email here

mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "fromaccount"); //set your username here
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "password"); //set your password here
SmtpMail.SmtpServer = "mail.yahoo.com"; //your real server goes here
SmtpMail.Send( mail );

It gives the error message: "The transport failed to connect to the server."
what should i do?