how to send mail from my own website

try
       {

           var fromAddress = "contactus@investemu.com";

           var toAddress = txtfrmmailid.Text.ToString();

           string fromPassword ="mypassword";

           string subject = txtsubject.Text.ToString();
           string body = "From: Carshop\n";
           body += "Email: contactus@investemu.com\n";
           body += "Subject: " + txtsubject.Text + "\n";
           body += "Message: \n" + txtcomments.Text + "\n";
           // smtp settings
           var smtp = new System.Net.Mail.SmtpClient();
           {
               smtp.Host = "smtp.investemu.com";
               smtp.Port = 25;
               smtp.EnableSsl = true;
               smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
               smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
               smtp.Timeout = 20000;
           }

           // Passing values to smtp object
           smtp.Send(fromAddress, toAddress, subject, body);
       }
       catch (Exception err)
       {
           errormessage(err.Message);
       }

private void errormessage(string msg)
   {
       Response.Write("<script type=Text/Javascript> alert('" + msg + "'); </script>");
   }