我需要使用C＃禁用ASP.NET中特定用户的母版菜单控件中的菜单项

嗨
我已经完成了一个网站，我需要控制其他用户查看除ADMIN以外的所有内容页面



我有什么试过：

Hi I have completed a website and I need to Control other user from viewing all the content pages except ADMIN

What I have tried:

My masterpage.aspx<br />
<pre><div class="menu"><br />
<br />
            <ul><br />
<br />
                <li class="navigation_first_item"><a id="menu1" href="Default.aspx" runat="server">Home</a></li><br />
                <li class="navigation_s"><a id="menu2" href="Add User.aspx" runat="server">Add User</a></li><br />
                <li><a id="menu3" href="Registrationpage.aspx" runat="server">Register Employee</a></li><br />
                <li><a id="menu4" href="Contact.aspx" runat="server">Contact</a></li><br />
            </ul><br />
<br />
        </div></pre>

My mastrpage.cs

 protected void Page_Load(object sender, EventArgs e)
        {
           
                            lbltime.Text = DateTime.Now.ToString("hh:mm tt");
                lblusername.Text = Session["username"].ToString();


                var menu = Page.Master.FindControl("Menu1") as Menu;
                if (Session["level"] == null)
                {
                    menu.Items.Remove(menu.FindItem("AddUser.aspx"));
                    menu.Items.Remove(menu.FindItem("Register.aspx"));
                }
                else if ((Session["Admin"].ToString().Equals("Contact.aspx")))
                {
                    menu.Items.Remove(menu.FindItem(" "));
                    menu.Items.Remove(menu.FindItem(""));
                    menu.Items.Remove(menu.FindItem(""));
                    menu.Items.Remove(menu.FindItem(""));
                }

            }

Loginpage.cs
 protected void Page_Load(object sender, EventArgs e)
        {
            var menu = Page.Master.FindControl("menu") as Menu;
            if (Session["level"] == null)
            {
                menu.Items.Remove(menu.FindItem("menu1"));
                menu.Items.Remove(menu.FindItem("menu2"));
            }
            else if (Session["level"] == "ADMIN")
            {
                menu.Items.Remove(menu.FindItem("menu4"));
                menu.Items.Remove(menu.FindItem("menu3"));
            }
            MenuItemCollection menuItems = menu.Items;
            MenuItem menuItem = new MenuItem();
            foreach (MenuItem item in menuItems)
            {
                if (item.Text == "Default.aspx")
                    menuItem = item;
            }
        }