C#

<pre lang="c#">void Page_Load(Object sender, EventArgs e)
  {
    if (!IsPostBack)
    {
      // Retrieve the root menu item from the Items
      // collection of the Menu control.
      MenuItem homeMenuItem = NavigationMenu.Items[0];

      // Retrieve the Movie submenu item from the ChildItems
      // collection of the root menu item.
      MenuItem movieSubMenuItem = NavigationMenu.FindItem(@"Home\Movies");

      // Remove the Movie submenu item.
      if (movieSubMenuItem != null)
      {
        homeMenuItem.ChildItems.Remove(movieSubMenuItem);
      }
    }
  }

class A {
   public void Hello( )  {
System.Console.WriteLine("Hello World ");
                                          } 
              } 
//********************************
class B <T>  where T:A
{   //  case 1    }
//**********************************
Class C <T> T: A
{// case2       }