private void Page_Load(object sender, System.EventArgs e)
{
       MailMessage mail = new MailMessage();
       mail.To = "me@mycompany.com";
       mail.From = "you@yourcompany.com";
       mail.Subject = "this is a test email.";
       mail.Body = "Some text goes here";
       mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1"); //basic authentication
       mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "my_username_here"); //set your username here
      mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "super_secret"); //set your password here

    SmtpMail.SmtpServer = "mail.mycompany.com";  //your real server goes here
    SmtpMail.Send( mail );
}