private void InstallHook()
        {
            if (Handle != 0) throw new Exception("Hook is already installed");

            int htype = 0;

            switch (HookType)
            {
                case HookTypes.Mouse:
                    htype = WinApi.WH_MOUSE_LL;
                    break;
                case HookTypes.Keyboard:
                    htype = WinApi.WH_KEYBOARD_LL;
                    break;
                default:
                    throw new Exception("HookType is not supported");
            } 
            _HookProc = new HookProcCallBack(HookProc);

            _hHook = WinApi.SetWindowsHookEx(htype, _HookProc, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
            
            if (Handle == 0) throw new Win32Exception(Marshal.GetLastWin32Error());
        }

            _hHook = WinApi.SetWindowsHookEx(htype, _HookProc, System.Diagnostics.Process.GetCurrentProcess().MainModule.BaseAddress, 0);