动态添加、删除附件

js代码:
//attAchments是一个table的ID
<script language="javascript">
function AddAttachments()
{

 document.getElementById('attach').innerText = "继续添加附件";
 tb = document.getElementById('attAchments');   
 newRow = tb.insertRow();
 newRow.insertCell().innerHTML = "<input name='File' size='50' type='file'>&nbsp;&nbsp;<input type=button value='删除' onclick='delFile(this.parentElement.parentElement.rowIndex)'>";
}
function delFile(index)
{
 document.getElementById('attAchments').deleteRow(index);
 tb.rows.length > 0?document.getElementById('attach').innerText = "继续添加附件":document.getElementById('attach').innerText = "继续添加附件";
} 
</script>
页面:
<form id="form1" runat="server" enctype="multipart/form-data">

C#方法
//
        public void UploadFile(HttpRequest Request, System.Web.UI.Page ThisPage)
        {
            for (int i = 0; i < Request.Files.Count; i++)
            {
                if (Request.Files[i].FileName != "")//Add images to WorkGuideFile file
                {
                    string RandomString = Convert.ToString(Guid.NewGuid());
                    string TrueName = Path.GetFileName(Request.Files[i].FileName);
                    int j = TrueName.LastIndexOf(".");
                    string ExtendName = TrueName.Substring(j);
                    string RandomName = RandomString + ExtendName;
                    string filepath = ThisPage.Server.MapPath("~/DownloadFiles/article/" + RandomName);
                    Request.Files[i].SaveAs(filepath);
                    ArticleDataAccess.Article_ArticleAccessoriesAdd(TrueName, RandomName);
                }
            }
        }