上载多文档
请问下列代码怎样修改可实现上载多文档？
private void FileUpload(string fileurl, string filename, string strGuid) { SPSecurity.RunWithElevatedPrivileges(delegate()//模仿管理员的权限进行操作（代码访问权限提升） { using (SPSite site = new SPSite(SPContext.Current.Site.ID))//实例化SPWeb对象才能保证执行者是管理员 { site.AllowUnsafeUpdates = true; using (SPWeb web = site.AllWebs[SPContext.Current.Web.ID]) { web.AllowUnsafeUpdates = true; string Path = @"D:\Folder\" + filename; this.FileUpload1.SaveAs(Path); fileurl = Path; SPList Mylist = web.Lists["项目申请"]; FileStream fstream = File.OpenRead(fileurl);//以文件流的形式读取文件源 byte[] contens = new byte[fstream.Length];//定义一个直接数组 fstream.Read(contens, 0, (int)fstream.Length);//把文件源写入到数组容器 fstream.Close();//关闭文件流 String url = ""; SPQuery query = new SPQuery(); query.Query = @"<Where><Eq><FieldRef Name='sGUID'/><Value Type='Text'>" + strGuid + @"</Value></Eq> </Where>"; SPListItemCollection myItems = Mylist.GetItems(query); //SPListItemCollection myItems = Mylist.Items; foreach (SPListItem item in myItems) { string psGuid = item["sGUID"].ToString(); if (psGuid == strGuid) { if (item.Attachments.Count > 0) { Response.Write("<script language=javascript>alert('该申请文档已经提交，请不要重复提交！')</script>"); } else { SPAttachmentCollection attach = item.Attachments; url = attach.UrlPrefix; attach.Add(filename, contens); item.Update(); File.Delete(Path); } break; } } } } }); }