How to disable Delete Menu Item(Right click on File node) from Vs Package node

  I tried with below solution but it didn't work!!

  CommandID menuCommandID = new CommandID(VSConstants.GUID_VSStandardCommandSet97, (int)VSConstants.VSStd97CmdID.Delete);
            OleMenuCommand menuItem = new OleMenuCommand(MenuItemCallback, menuCommandID);
            menuItem.Visible = false;