how to hide menu in mvc 3 on master page

@if(Session["username"] !=null)
    {
 

 
     
 @Html.ActionLink("Manange Step", "Index", "Adminmanage")
 &nbsp 
@Html.ActionLink("Manange Errorcode", "Index", "Admin")&nbsp&nbsp

 @Html.ActionLink("LogOut", "LogOn", "Account")&nbsp&nbsp
     

        }