public static extern IntPtr SendMessage(IntPtr hWnd, AcWinAPI.WM Msg, int wParam, [MarshalAs(UnmanagedType.LPWStr)] string lParam);
public static extern IntPtr SendMessage(IntPtr hWnd, AcWinAPI.WM Msg, int wParam, int lParam);
public static extern IntPtr SendMessage(IntPtr hWnd, AcWinAPI.WM Msg, IntPtr wParam, StringBuilder lParam);