asp.Net添付機能付きの簡単なメール送信

<div>
       ：<asp:TextBox ID="txt_toman" runat="server"></asp:TextBox>
        <br />
          ：<asp:TextBox ID="txt_title" runat="server"></asp:TextBox>
        <br />
          ：<asp:TextBox ID="txt_content" runat="server" Height="66px" 
            TextMode="MultiLine" Width="194px"></asp:TextBox>
        <br />
          ：<asp:FileUpload ID="FileUpload1" runat="server" />
        <br />
        <asp:Button ID="btn_send" runat="server" onclick="btn_send_Click" 
            Text="   Send   " />
        <asp:Label ID="lbl_mag" runat="server" ForeColor="Red"></asp:Label>
    </div>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
using System.Text;

namespace WebApplication1
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btn_send_Click(object sender, EventArgs e)
        {
            bool flag = SendMail("     ", "   ", "   ", "  ", txt_title.Text, txt_content.Text, txt_toman.Text, FileUpload1);
            if (flag)
            {
                lbl_mag.Text = "    ";
            }
            else
            {
                lbl_mag.Text = "  ，     ！";
            }
        }

        /// <summary>
        ///        
        /// </summary>
        /// <param name="user">     </param>
        /// <param name="who">   </param>
        /// <param name="name">     </param>
        /// <param name="pwd">     </param>
        /// <param name="title">    </param>
        /// <param name="body">    </param>
        /// <param name="shoujian">     </param>
        /// <param name="file">  </param>
        /// <returns>      </returns>

        public static bool SendMail(string user, string who, string name, string pwd, string title, string body, string shoujian, FileUpload file)
        {

            MailMessage Message = new MailMessage(
                new MailAddress(user,   //          ，
                                who, //          
                               Encoding.UTF8),      //  
                                new MailAddress(shoujian));//     
            if (file.HasFile)
            {
                //    
                if (file.PostedFile != null)
                {
                    Attachment attachment = new Attachment(file.PostedFile.InputStream, file.PostedFile.FileName);
                    Message.Attachments.Add(attachment);
                }
            }
            Message.SubjectEncoding = Encoding.UTF8;
            Message.Subject = title;//  
            Message.BodyEncoding = Encoding.UTF8;
            Message.IsBodyHtml = true;
            Message.Body = body; //  
            Message.Priority = MailPriority.High;

            SmtpClient smtpClient = new SmtpClient("smtp.163.com", 25);
            //                                   //    
            smtpClient.Credentials = new System.Net.NetworkCredential(name, pwd);
            //                               //     
            smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtpClient.Timeout = 99999;
            try
            {
                smtpClient.Send(Message);
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
    }
}