[DllImport("user32.dll", EntryPoint = "GetScrollInfo", CallingConvention = CallingConvention.StdCall)]        public static extern bool GetScrollInfo(IntPtr hwnd, int fnBar, ref SCROLLINFO lpsi);        [DllImport("user32.dll", EntryPoint = "SetScrollInfo", CallingConvention = CallingConvention.StdCall)]        public static extern int SetScrollInfo(IntPtr hwnd, int fnBar, [In] ref SCROLLINFO lpsi, bool fRedraw);        [DllImport("User32.dll", CharSet = CharSet.Auto, EntryPoint = "SendMessage", CallingConvention =CallingConvention.Cdecl)]        static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);        [DllImport("user32.dll", CharSet = CharSet.Auto, EntryPoint = "PostMessage")]          public static extern bool PostMessage(IntPtr hWnd, uint Msg, int wParam, int lParam);        [DllImport("gdi32.dll")]        public static extern int CreateRoundRectRgn(int x1, int y1, int x2, int y2, int x3, int y3);        [DllImport("user32.dll")]        public static extern int SetWindowRgn(IntPtr hwnd, int hRgn, Boolean bRedraw);        [DllImport("user32.dll")]        [return: MarshalAs(UnmanagedType.Bool)]        public static extern bool ShowScrollBar(IntPtr hWnd, int wBar, bool bShow);        [DllImport("user32.dll")]        public static extern IntPtr GetWindowDC(IntPtr hWnd);        [DllImport("user32.dll")]        public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);