How To Disable The Menu Item From Menu Control of Master Page For Particular User In Asp.Net Using C#....As I Had Declared Session Variable In Login Page

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Data;

public partial class LogIn : System.Web.UI.Page
{
    SqlCommand cmd;
    SqlConnection sqlconn;
    SqlDataAdapter da;
    DataSet ds;

    MasterPage p1 = new MasterPage();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            try
            {

                sqlconn = new SqlConnection(ConfigurationManager.ConnectionStrings["ODC"].ConnectionString.ToString());
                sqlconn.Open();
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message);
            }
            finally
            {
                sqlconn.Close();
            }
        }


    }
    protected void btnsubmit_Click1(object sender, EventArgs e)
    {
        int i = 0;


        try
        {
            sqlconn = new SqlConnection(ConfigurationManager.ConnectionStrings["ODC"].ConnectionString.ToString());
            sqlconn.Open();
            SqlDataAdapter da = new SqlDataAdapter("Select Eid,Designation from Emp_Master where Eid='" + logdll.SelectedItem.Value + "' and Password='" + txtpswd.Text + "'", sqlconn);
            ds = new DataSet();
            da.Fill(ds);
            if (ds.Tables[0].Rows.Count > 0)
            {
                string utype = ds.Tables[0].Rows[0][1].ToString();
                Response.Write("<script language='javascript'>alert('hello')</script>");
                switch (utype)
                {

                    case "Admin":
                        utype = logdll.SelectedItem.Text;
                        Session["Eid"] = logdll.SelectedItem.Value;
                        Session["abcd"] = "admin";
                        Response.Redirect("AdminHomePage.aspx");
                       
                        break;
                    case "PM":
                        utype = logdll.SelectedItem.Text;
                        Session["Eid"] = logdll.SelectedItem.Value;
                        Session["abcd"] = "PM";
                        Response.Redirect("Project_Details.aspx");
                        break;
                    case "Emp":
                        utype = logdll.SelectedItem.Text;
                        Session["Eid"] = logdll.SelectedItem.Value;
                        Session["abcd"] = "Emp";
                        Response.Redirect("Work_Master.aspx");
                        break;
                    default:
                        Label11.Visible = true;
                        Label11.Text = " Invalid Password! Please retype the Password";
                        Session["abcd"] = "def";
                        break;

                        
                }



                Response.Write("<script language='javascript'>alert('User Login successful !')</script>");

            }
            else
            {
                Response.Write("<script language='javascript'>alert('Please enter valid Eid and Password')</script>");
                i = 1 + 1;
                if (i == 4)
                {
                    Response.Write("<script language='javascript'>alert('Try again')</script>");
                }
                else
                {
                    logdll.SelectedItem.Value = logdll.SelectedItem.Text;
                    txtpswd.Text = "";

                }
            }


        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }
        finally
        {
            sqlconn.Close();
        }

    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class MasterPage : System.Web.UI.MasterPage
{

    protected void Page_Load(object sender, EventArgs e)
    {
        var menu = Page.Master.FindControl("Menu1") as Menu;

        if (!IsPostBack)
        {

            if (Session["abcd"]== null)
            {
                //menu.Items.Remove(menu.FindItem("Reports"));
                //menu.Items.Remove(menu.FindItem("Master"));
            }
            else if(Session["abcd"]=="admin")
            {
                menu.Items.Remove(menu.FindItem("Employee"));
                menu.Items.Remove(menu.FindItem("Reports"));
            }
          /*  MenuItemCollection menuItems = Menu1.Items;
            MenuItem menuItem = new MenuItem();
            foreach (MenuItem item in menuItems)
            {
                if (item.Text == "Home")
                    menuItem = item;
            }
            menuItems.Remove(menuItem);*/
        }
    }
}