asp.net，简单权限。存取读XML

public string strToExcel = "none";
public string strConter = "none";
public string updateuid = "";
public string fileContents;

public void XunHuan()
        {

            string Modify_Employ = Session["Login_Employ_No"];
            string filename = null;
            string curDir = System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase;
            //运行文件的当前相对目录     '""

            curDir = curDir.Substring(curDir.IndexOf("E:"), curDir.LastIndexOf(".") - 8);
            filename = curDir + "/aul.xml";
            filename = filename.Replace(".", "/").Replace("aul/xml", "aul.xml").Replace("/WebRoot/bin/Status", "");
            //Response.Write(filename)
            XmlDocument doc = new XmlDocument();
            doc.Load(filename);

            XmlNode root = doc.DocumentElement;
            XmlNode shopId = root.SelectSingleNode("//base/shopId");
            fileContents = shopId.InnerText;
            //读取节点值

            //控制导出功能的显示隐藏
            if (fileContents.IndexOf(Modify_Employ) >= 0)
            {
                strToExcel = "block";
            }
            string fileConter = "0002439,0004698,0000403,";
            //控制权限功能的显示隐藏
            if (fileConter.IndexOf(Modify_Employ) >= 0)
            {
                strConter = "block";
            }

            string strtypeuid = Request.QueryString["hdtuid"];
            //获取隐藏域的操作类型 a添加  d是移除
            updateuid = Request.QueryString["txtuserid"];
            //要添加或删除的员工ID
            //如果参数是添加员工
            if (strtypeuid == "a")
            {
                if (fileContents.IndexOf(updateuid) >= 0)
                {
                    //Page.ClientScript.RegisterStartupScript(Page.GetType(), "message0", "<script language='javascript'>alert('该员工已有权限');</script>")
                }
                else
                {
                    shopId.InnerText = fileContents + updateuid + ",";
                    //设置节点值
                    doc.Save(filename);
                    //保存XML
                    //My.Computer.FileSystem.WriteAllText("E:/Project/eip/WebRoot/eiptohtuserlist.txt", fileContents & updateuid & ",", False, System.Text.Encoding.Unicode) '把员工ID保存进文件
                    Page.ClientScript.RegisterStartupScript(Page.GetType(), "message1", "<script language='javascript'>alert('添加成功');document.forms[0].submit();</script>");
                }
            }
            //如果参数是移除员工
            if (strtypeuid == "d")
            {
                fileContents = fileContents.Replace(updateuid + ",", "");
                shopId.InnerText = fileContents;
                //设置节点值
                doc.Save(filename);
                //保存XML
                //My.Computer.FileSystem.WriteAllText("E:/Project/eip/WebRoot/eiptohtuserlist.txt", fileContents, False, System.Text.Encoding.Unicode) '把员工ID保存进文件
                Page.ClientScript.RegisterStartupScript(Page.GetType(), "message2", "<script language='javascript'>alert('移除成功');  self.opener.location.reload(); </script>");
            }

            

        }