private void send_mail()
 {
  MailMessage message=new MailMessage();	      // The mail addresses are read from the form
  message.To.Add(new MailAddress(TextBox1.Text));
  message.From=new MailAddress(TextBox2.Text));
  message.CC.Add(new MailAddress(TextBox3.Text));
  message.Subject=TextBox4.Text;
  message.Body=TextBox5.Text;
  message.IsBodyHtml=false;
  message.Priority=MailPriority.Normal;
  message.Attachments.Add(new Attachment(FileUpload1.PostedFile.FileName)); 
                                                                                  // File Posted in the FileUpload control
  SmtpClient sclient1=new SmtpClient();
  sclient1.Send(message);
 
 }