Sending a message to gmail account ...

string from ="test@gmail.com"; //Replace this with your own correct Gmail Address

      string to = "test1@gmail.com";//Replace this with the Email Address to whom you want to send the mail

      System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
      mail.To.Add(to);
      mail.From = new MailAddress(from, "One Ghost", System.Text.Encoding.UTF8);
      mail.Subject = "This is a test mail";
      mail.SubjectEncoding = System.Text.Encoding.UTF8;
      mail.Body = "This is Email Body Text";
      mail.BodyEncoding = System.Text.Encoding.UTF8;
      mail.IsBodyHtml = true;
      mail.Priority = MailPriority.High;

      SmtpClient client = new SmtpClient();
      //Add the Creddentials- use your own email id and password

      client.Credentials = new System.Net.NetworkCredential(from, "********");

      client.Port = 587; // Gmail works on this port
      client.Host = "smtp.gmail.com";
      client.EnableSsl = true; //Gmail works on Server Secured Layer
      try
      {
          client.Send(mail);
      }
      catch (Exception ex)
      {
          Exception ex2 = ex;
          string errorMessage = string.Empty;
          while (ex2 != null)
          {
              errorMessage += ex2.ToString();
              ex2 = ex2.InnerException;
          }
          HttpContext.Current.Response.Write(errorMessage);
      } // end try