轻松实现一个页面多文件上传

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

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

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string path = Server.MapPath("~/upload/");
            HttpFileCollection uploadFiles = Request.Files;
            for (int i = 0; i < uploadFiles.Count; i++)
            {
                HttpPostedFile userPostedFile=uploadFiles[i];
                try
                {
                    if (userPostedFile.ContentLength > 0)
                    {
                        userPostedFile.SaveAs(path + userPostedFile.FileName);
                    }
                }
                catch (Exception)
                {

                    throw;
                }
            }

        }
    }
}

Code
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="uploadFile.aspx.cs" Inherits="FileIO.uploadFile" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

        <asp:FileUpload ID="FileUpload1" runat="server" /><br />
        <asp:FileUpload ID="FileUpload2" runat="server" /><br />
        <asp:FileUpload ID="FileUpload3" runat="server" /><br />
        <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="upload" />

    </div>
    </form>
</body>
</html>