后台代码：

//-------------------------------------------------------------------------------------------------------

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Web.Mail;
using System.IO;

namespace SendEmailModule
...{
    /**//// <summary>
    /// sendMailResume 的摘要说明。
    /// </summary>
    public class sendMailResume : System.Web.UI.Page
    ...{
        protected System.Web.UI.WebControls.Panel panelMessage;
        protected System.Web.UI.WebControls.Panel panelMain;
        protected System.Web.UI.WebControls.RequiredFieldValidator rfvEmail;
        protected System.Web.UI.WebControls.TextBox txtYourEmail;
        protected System.Web.UI.WebControls.TextBox txtMessage;
        protected System.Web.UI.WebControls.Button btnSubmit;
        protected System.Web.UI.WebControls.RegularExpressionValidator RevEmail;
        protected System.Web.UI.WebControls.Label lblAlert;
        protected System.Web.UI.WebControls.Button btnUploadOk;
        protected System.Web.UI.HtmlControls.HtmlInputFile fileUpload;
        protected System.Web.UI.WebControls.Label lblUploadFileds;
        protected System.Web.UI.WebControls.Panel PanelError;
   
        private void Page_Load(object sender, System.EventArgs e)
        ...{
            // First on Load
            if(!this.IsPostBack)           
            ...{               
                this.theArrayFile = new ArrayList();               
            }
        }

        private void btnUploadOk_Click(object sender, System.EventArgs e)
        ...{
            string fullPath = this.fileUpload.PostedFile.FileName;
            if(fullPath == "")
                return;           
            string Filepostfix = fullPath.Substring(fullPath.LastIndexOf(".") + 1).ToLower();
            if(Filepostfix == "doc" || Filepostfix == "pdf")
              &