c#.net getFocusedControl

[DllImport("user32")]

        public static extern IntPtr GetForegroundWindow();

        [DllImport("user32")]

        public static extern bool AttachThreadInput(uint idAttach, uint idAttachTo, bool fAttach);

        [DllImport("user32")]

        public static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);

        [DllImport("user32")]

        public static extern uint SendMessage(IntPtr hWnd, uint Msg, uint wParam, uint lParam);

        [DllImport("kernel32.dll", SetLastError = true)]

        static extern uint GetCurrentThreadId();

        [DllImport("user32.dll")]

        static extern IntPtr GetFocus();

        [ComImport]

        [Guid("00000114-0000-0000-C000-000000000046")]

        [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]

        public interface IOleWindow

        {

            void GetWindow(out IntPtr phwnd);

            void ContextSensitiveHelp([In, MarshalAs(UnmanagedType.Bool)] bool fEnterMode);

        }

IntPtr focusHwnd = GetFocusedControl();

IntPtr GetFocusedControl()

        {

            IntPtr hFocus;

            IntPtr hFore;

            uint id = 0;

            hFore = GetForegroundWindow();

            AttachThreadInput(GetWindowThreadProcessId(hFore, out id), GetCurrentThreadId(), true);

            hFocus = GetFocus();

            AttachThreadInput(GetWindowThreadProcessId(hFore, out id), GetCurrentThreadId(), false);

            return hFocus;

        }