How to disable or enable Navigation Menu Items based on roles

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ASP.NET

This is my code

<asp:Menu ID="NavigationMenu" runat="server" CssClass="menu" EnableViewState="false" IncludeStyleBlock="false" Orientation="Horizontal">
                    <Items>
                        <asp:MenuItem NavigateUrl="~/Default.aspx" Text="Home"/>
                        <asp:MenuItem NavigateUrl="~/About.aspx"   Text="About"/>
                        <asp:MenuItem NavigateUrl="~/StudentEnquiry.aspx" Text="Enquiry Form"/>
                        <asp:MenuItem NavigateUrl="~/Reports.aspx" Text="Reports" />
                    </Items>
                </asp:Menu>

I just want to disable the Reports.aspx menu in NavigationMenu when he is a Normal User, it will show when he is a admin user.


This is my code, when i redirect from this page to StudentEnquiry page the Reports page should disable. could anyone tell me...

protected void Page_Load(object sender, EventArgs e)
       {
           string SAuth = Request.QueryString.Get(0);
           if (SAuth == "True")
           {
             Label1.Text = Convert.ToString(Session["EmpId"]);
             string type = Convert.ToString(Session["User_Type"]);

             //  Label1.Text = "Authenticated";
             if (type == "Adm")
             {
                 // I think i need to write some code here
                 Response.Redirect("StudentEnquiry.aspx?a=" + Label1.Text + "");
             }

           }
           else
           {
               Label1.Text = "Not Authenticated";
           }
       }