MailMessage mail = new MailMessage();
        mail.To.Add("hira.aftab87@gmail.com");
        // mail.To.Add("amit_jain_online@yahoo.com");
        mail.From = new MailAddress("jagdeepmatharu@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.Port = 587;

        smtp.Credentials = new System.Net.NetworkCredential
             ("jagdeepmatharu@gmail.com", "root.8787");
        //Or your Smtp Email ID and Password
        smtp.EnableSsl = true;
        smtp.Send(mail);