asp.netweb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();
}

}
}