if user role is Customer, i want admin linkbutton visible = false, but it still show up. Please Help

Using session for login, after redirect, the masterpage code doesn't work out. if user role is Customer, i want admin linkbutton visible = false, but it still show up

this my login code

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

using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Configuration;

using System.Drawing;

namespace incup
{
    public partial class Login : System.Web.UI.Page
    {
        SqlConnection conn = new    SqlConnection(ConfigurationManager.ConnectionStrings["inCupConnectionString"].ConnectionString);
        DataSet DS = new DataSet();
        DataTable DT = new DataTable();

        protected void Page_Load(object sender, EventArgs e)
        {

        }


        protected void btnLogin_Click(object sender, EventArgs e)
        {
            

            string hakAkses;
            string sql;
            sql = "SELECT * FROM RegisterLog WHERE [E-mail] = '" + txtLEmail.Text + "' AND " + "Password = '" + txtLPass.Text + "'";

            SqlCommand CMD = new SqlCommand(sql, conn);
            SqlDataAdapter DA = new SqlDataAdapter(CMD);
            DS.Clear();
            DA.Fill(DS);
            DT = DS.Tables[0];

    
            if (DT.Rows.Count > 0)
            {
                hakAkses = DT.Rows[0]["UserRole"].ToString(); 
                Session["MyUser"] = txtLEmail.Text;
                Session["HakAkses"] = hakAkses; 
                UpdateLogin();
                Response.Redirect("Home.aspx");
            }
            else
            {
                txtLEmail.Text = "";

                string message = "E-mail or Password is incorrect!";
                System.Text.StringBuilder sb = new System.Text.StringBuilder();
                sb.Append("<script type = 'text/javascript'>");
                sb.Append("window.onload=function(){");
                sb.Append("alert('");
                sb.Append(message);
                sb.Append("')};");
                sb.Append("</script>");
                ClientScript.RegisterClientScriptBlock(this.GetType(), "alert", sb.ToString());
            }
     }

    void UpdateLogin()
    {
        string sql;
        sql = "UPDATE RegisterLog SET status = 'TRUE' WHERE [E-mail] = '" + txtLEmail.Text + "'";

        SqlCommand cmdSTATUS = new SqlCommand(sql, conn);
        conn.Open();
        cmdSTATUS.ExecuteNonQuery();
        conn.Close();
    }

        }
    }

and this is home.aspx 's masterpage code

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

using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Configuration;

namespace incup
{
    public partial class SiteALogin : System.Web.UI.MasterPage
    {
        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["inCupConnectionString"].ConnectionString);

        protected void Page_Load(object sender, EventArgs e)
        {
            if (Session["MyUser"] != null)
            {
                lblEmail.Text = Session["MyUser"].ToString();
                lblLevel.Text = Session["HakAkses"].ToString();

                if (lblLevel.Text == "Admin")
                {

                    lbAdminArea.Visible = true;
                    lbMyAcc.Visible = false;
                    lbOUT.Visible = false;
                }
                else if (lblLevel.Text == "Customer")
                {

                    lbAdminArea.Visible = false;
                    lbMyAcc.Visible = true;
                    lbOUT.Visible = false;

                }
                
            }
            else
            {
                Response.Redirect("SignIn.aspx");
            }
        }

        protected void lbOUT_Click(object sender, EventArgs e)
        {
            Session.RemoveAll();
            UpdateLogout();
            Response.Redirect("SignIn.aspx");
        }
        private void UpdateLogout()
        {
            string sqlLogout;
            sqlLogout = "UPDATE RegisterLog SET status = 'FALSE' WHERE [E-mail] = '" + lblEmail.Text + "'";

            SqlCommand cmdLogout = new SqlCommand(sqlLogout, conn);
            conn.Open();
            cmdLogout.ExecuteNonQuery();
            conn.Close();
        }
    }
}

Please help. why lbAdminArea still show up when i login using customer account. thanks masters :D