Retrieves a window handle to the Windows Forms user control.
inline HWND GetControlHandle( ) const throw( );
This method is provided as a convenient way to obtain a window handle (HWND) for a UserControl control, rather than performing a series of casts on a managed object, such as:
HWND hwnd = reinterpret_cast<HWND>(static_cast<INT_PTR>(GetControl()->Handle));
Returns a window handle to the Windows Forms user control.