Send Email With ASP.NET C# (Yahoo & Gmail)

I searched the we for ways to send mail with C# and alot of the examples that I found didn't work.  Here is one that did.

Gmail:

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using System.Net.Mail;         {         MailMessage mail = new MailMessage();         mail.To.Add("xxxxx@gmail.com");         mail.To.Add("xxxxx@yahoo.com");         mail.From = new MailAddress("xxxxx@gmail.com");         mail.Subject = "Email using Gmail";           string Body = "Hi, this mail is to test sending mail" +                       "using Gmail in ASP.NET";         mail.Body = Body;           mail.IsBodyHtml = true;         SmtpClient smtp = new SmtpClient();         smtp.Host = "smtp.gmail.com"; //Or Your SMTP Server Address         smtp.Credentials = new System.Net.NetworkCredential              ("xxxxx@gmail.com", "yourpassword");         //Or your Smtp Email ID and Password         smtp.EnableSsl = true;         smtp.Send(mail);           }

Yahoo:

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using System.Net.Mail;   {               MailMessage mail = new MailMessage();             mail.To.Add("email address to sent to");             mail.To.Add("email address to sent to");             mail.From = new MailAddress("from email address @ yahoo");             mail.Subject = "Email using Yahoo";               string Body = "Hi, this mail is to test sending mail" +                           "using Yahoo in ASP.NET";             mail.Body = Body;               mail.IsBodyHtml = true;             SmtpClient smtp = new SmtpClient();             smtp.Host = "smtp.mail.yahoo.com"; //Or Your SMTP Server Address             smtp.Credentials = new System.Net.NetworkCredential                  ("username", "password");             //Or your Smtp Email ID and Password             //smtp.EnableSsl = true;             smtp.Send(mail);   }