C #: Using the window's own function (for example: User32.dll)

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[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);