MailMessage mess = new MailMessage();
        mess.To = TextBox1.Text;
        mess.From = TextBox2.Text;
        mess.Subject = TextBox3.Text;
        //mess.Attachments.Add(FileUpload1);
        mess.Body = TextBox4.Text;
        try {
            SmtpMail.SmtpServer = "localhost";
            SmtpMail.Send(mess);
            } 
        catch (HttpException ex) 
        {
            Response.Write("HTTP Error: " + ex.ToString());
        } 
        catch (Exception ex)    
        {
        Response.Write("Error: " + ex.ToString());
        }