关于动态上传多个图片的问题，AJAX高手请进啊，帮帮忙，急用！！！万分感激！

悬赏园豆：15 [已关闭问题]

实在没有办法，我就这么点专家分了，全压上了啊！

最近做项目，需要用户上传多张图片，同时设置每张图片的name，和description。可是我不知道怎么做，在网上下载了个代码，但是它只能动态生成上传的控件，不能动态的生成填写name和description的控件，下面是它的页面代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FileUpload.aspx.cs" Inherits="FileUpload" %>
<!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>
    <title>Multi File Upload</title>
</head>
<body>
<form id="form1" runat="server" enctype="multipart/form-data">
<div id="mainDiv">
<p id="upload-area">
   <input id="File1" type="file" runat="server" size="60" />
</p>

<input id="AddFile" type="button" value="Add file" onclick="addFileUploadBox()" />
<p><asp:Button ID="btnSubmit" runat="server" Text="Upload Now"  OnClick="btnSubmit_Click" /></p>
</div>
<script type="text/javascript">
function addFileUploadBox()
{
    if (!document.getElementById || !document.createElement)
        return false;
        
    var uploadArea = document.getElementById ("upload-area");
    
    if (!uploadArea)
        return;

    var newLine = document.createElement ("br");
    uploadArea.appendChild (newLine);
    
    var newUploadBox = document.createElement ("input");
    
    // Set up the new input for file uploads
    newUploadBox.type = "file";
    newUploadBox.size = "60";
    
    // The new box needs a name and an ID
    if (!addFileUploadBox.lastAssignedId)
        addFileUploadBox.lastAssignedId = 100;
        
    newUploadBox.setAttribute ("id", "dynamic" + addFileUploadBox.lastAssignedId);
    newUploadBox.setAttribute ("name", "dynamic:" + addFileUploadBox.lastAssignedId);
    uploadArea.appendChild (newUploadBox);
    addFileUploadBox.lastAssignedId++;
}


</script>
</form>
</body>
</html>

下面是后台的处理代码

Code
protected void btnSubmit_Click(object sender, EventArgs e)
    {
        HttpFileCollection uploads = HttpContext.Current.Request.Files;
        
        for (int i = 0; i < uploads.Count; i++)
        {
            HttpPostedFile upload = uploads[i];
            
            if (upload.ContentLength == 0)
                continue;

            string c = System.IO.Path.GetFileName(upload.FileName); // We don't need the path, just the name.

            try
            {
                upload.SaveAs("C:\\UploadedUserFiles\\" + c);
            }
            catch (Exception Exp)
            {
                
            }
        }
        Server.Transfer("UploadComplete.aspx");
    }