static extern IntPtr LoadKeyboardLayout(string pwszKLID, uint Flags);

LoadKeyboardLayout("00000429", 1);

//the layout is not installed in regional settings, nothing will happen, but with LoadKeyboardLayout, the input

    static extern bool UnloadKeyboardLayout(IntPtr hkl);

    static extern IntPtr LoadKeyboardLayout(string pwszKLID, uint Flags);

        pointer = LoadKeyboardLayout(klid.ToString("X8"), 1);

        UnloadKeyboardLayout(pointer);

        UnloadKeyboardLayout(pointer);

    static extern bool UnloadKeyboardLayout(IntPtr hkl);

    static extern IntPtr LoadKeyboardLayout(string pwszKLID, uint Flags);

        pointer = LoadKeyboardLayout(klid.ToString("X8"), 1);

        UnloadKeyboardLayout(pointer);

        UnloadKeyboardLayout(pointer);