How to hide menu on master page

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ASP.NET

I want to hide some menu on master page load after user Login, but my case after user Login Master Page load first time menu are hidden to user.but Master page again load that time hidden menu show to user but i don't want to show this menu to user. so how can hide this menu from user.provide solutions.

My code is:

 static int Permission = 0;
 if (!Page.IsPostBack)
  {
    if (Permission == 0)
    {
       ChkPermissions(); Permission = 1; 
    }
  }

public void ChkPermissions()
        {                          
          
            Ld = (LoginUserDetails)Session["userdetails"];
            if (Ld.Agent_Id > 0)
            {
                Linkdisable();
                foreach (var item in Ld.LoginPermissions)
                {
                    if (item.PermissionOperationName == "Access")
                    {
                        switch (item.PermissionItemName)
                        {
                            case "LandLord Master":
                                {
                                 
                                    LandlordPage.Visible = true;
                                    break;
                                }
                            case "Property Master":
                                {
                                   
                                    PropertyPage.Visible = true;
                                    break;
                                }
                            case "Parcel Master":
                                {
                                   
                                    ParcelPage.Visible = true;
                                    break;
                                }
                            case "Unit Master":
                                {
                                  
                                    UnitPage.Visible = true;
                                    break;
                                }
                            case "Tenent Master":
                                {
                                   
                                    TenentPage.Visible = true;
                                    break;
                                }
                        }
                    }
                }
            }
        }

public void Linkdisable()
        {
            AssignRolesPage.Visible = false; 
            LandlordPage.Visible = false;
            TenentPage.Visible = false;
            PropertyPage.Visible = false;
            ParcelPage.Visible = false;
            UnitPage.Visible = false;
          
        }