asp.net网站中上传文件代码

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;

 if (this.txtDescript.Text != "")
        {
            if (FileUpLoad1.HasFile)
            {
                //判断文件是否小于10Mb  
                if (FileUpLoad1.PostedFile.ContentLength < 10485760)
                {
                    try
                    {
                        //上传文件并指定上传目录的路径  
                        FileUpLoad1.PostedFile.SaveAs(Server.MapPath("~/UpLoad/")
                            + FileUpLoad1.FileName);
                        /*注意->这里为什么不是:FileUpLoad1.PostedFile.FileName 
                        * 而是:FileUpLoad1.FileName? 
                        * 前者是获得客户端完整限定(客户端完整路径)名称 
                        * 后者FileUpLoad1.FileName只获得文件名. 
                        */

                        //当然上传语句也可以这样写(貌似废话):  
                        //FileUpLoad1.SaveAs(@"D:\"+FileUpLoad1.FileName);  

                        //获取客户端要上传的文件路径
                        string fullfilename = this.FileUpLoad1.PostedFile.FileName;
                        //获取客户端要上传的文件名
                        string filename = fullfilename.Substring(fullfilename.LastIndexOf("\\") + 1);
                        //文件的相对路径
                        string RelativePath = "\\UpLoad\\" + filename;

                        //绝对路径
                        //operation.InsertSoft(ddlTitle.SelectedItem.ToString().Trim(),filename,fullfilename, txtDescript.Text.ToString().Trim(),false,DateTime.Now.ToString());

                        //相对路径
                        operation.InsertSoft(ddlTitle.SelectedItem.ToString().Trim(), filename, RelativePath, txtDescript.Text.ToString().Trim(), false, DateTime.Now.ToString());

                        //lblMessage.Text = "上传成功!";
                        Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script>if(confirm('上传成功！是否继续上传？')){location.href='UpLoad.aspx'}else{location.href='Welcome.aspx'}</script>");
                    }
                    catch (Exception ex)
                    {
                        lblMessage.Text = "出现异常,无法上传!";
                        lblMessage.Text += ex.Message;  
                    }
                }
                else
                {
                    lblMessage.Text = "上传文件不能大于10MB!";
                }
            }
            else
            {
                lblMessage.Text = "尚未选择文件!";
            } 
        }
        else
        {
            lblMessage.Text = "文件描述不能为空!";
        }