static extern bool IsIconic(IntPtr hWnd);

  Private Declare Auto Function IsIconic Lib "user32.dll" (ByVal hwnd As IntPtr) As Boolean

        public static extern bool IsIconic( IntPtr Hwnd );    

                if ( IsIconic( Hwnd ) )

      private static extern bool IsIconic(IntPtr hWnd);

          if (IsIconic(hWnd))