how to write "Sending messages to a mobile number and how to send a mail to the email address" in web application in .net

public int SendUserMail(string fromad, string toad, string body, string header, string subjectcontent)
    {
        int result = 0;
        MailMessage usermail = Mailbodplain(fromad, toad, body, header, subjectcontent);
        SmtpClient client = new SmtpClient();
        //Add the Creddentials- use your own email id and password
        client.Credentials = new System.Net.NetworkCredential("abc@gmail.com", "password"); ;
                client.Host = "smtp.gmail.com";
        client.Port = 587;
        client.EnableSsl = true; 
        try
        {
            client.Send(usermail);
            result = 1;
        }
        catch (Exception ex)
        {
            result = 0;
        } // end try 

        return result;

    }

public MailMessage Mailbodplain(string fromad, string toad, string body, string header, string subjectcontent)
   {
       System.Net.Mail.MailMessage mail = new System.Net.Mail.MailMessage();
       try
       {
           string from = fromad;
           string to = toad;
           mail.To.Add(to);
           mail.From = new MailAddress(from, header, System.Text.Encoding.UTF8);
           mail.Subject = subjectcontent;
           mail.SubjectEncoding = System.Text.Encoding.UTF8;
           mail.Body = body;
           mail.BodyEncoding = System.Text.Encoding.UTF8;
           mail.IsBodyHtml = true;
           mail.Priority = MailPriority.High;
       }
       catch (Exception ex)
       {
           throw;
       }
       return mail;
   }