C Sharp code for Sending an email

C# code for Sending an email

 private void send_mail()  
 {  
 MailMessage mm = new MailMessage("write_emailid_reciever", txtEmailId.Text);  
 mm.Subject = "Thnaks for your Feedback.";  
 mm.Body = "Dear Costomer Thanks for your feedback.You are more than welcome to give us a try again. Thank you.";  
 SmtpClient sc = new SmtpClient("mailing_server", 25);//25-is smtp port number  
 NetworkCredential nc = new NetworkCredential();  
 nc.UserName = "write_emailid_sender";  
 nc.Password = "password";  
 sc.Credentials = nc;  
 sc.Send(mm);  
 }