Hi,
string UserName="gmail's user Name";
string Password="gmail's Password";
MailMessage mail = new MailMessage();
SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
mail.From = new MailAddress("xhasiwe@gmail.com");
mail.To.Add("bella.moqekwa@expeditors.com");
mail.Subject = "Test Mail";
mail.Body = "This is for testing SMTP mail from GMAIL";
SmtpServer.Port = 465;
SmtpServer.Credentials = new System.Net.NetworkCredential(UserName, Password);
SmtpServer.EnableSsl = true;
SmtpServer.Send(mail);
Console.WriteLine("mail Send")
Try this...