asp.net web大文件上传带进度条实例代码

　　using System;

　　using System.Data;

　　using System.Configuration;

　　using System.Collections;

　　using System.Web;

　　using System.Web.Security;

　　using System.Web.UI;

　　using System.Web.UI.WebControls;

　　using System.Web.UI.WebControls.WebParts;

　　using System.Web.UI.HtmlControls;

　　using System.IO;

　　using System.Collections.Generic;

　　using System.Web.Configuration;

　　public partial class upload : System.Web.UI.Page

　　{

　　protected void Page_Load(object sender, EventArgs e)

　　{

　　try

　　{

　　// Get the data

　　HttpPostedFile jpeg_image_upload = Request.Files["Filedata"];

　　jpeg_image_upload.SaveAs(System.Web.HttpContext.Current.Server.MapPath("~/upload/") + jpeg_image_upload.FileName);

　　Response.StatusCode = 200;

　　Response.Write("文件处理完毕！");

　　}

　　catch

　　{

　　// If any kind of error occurs return a 500 Internal Server error

　　Response.StatusCode = 500;

　　Response.Write("未知错误！");

　　}

　　finally

　　{

　　// Clean up

　　Response.End();

　　}

　　}

　　}