c＃：SetScrollPos（user32.dll）

Question

I want to have 2 (rich)texboxes (vc# 2k8) with same scrolling... so when I scroll tb1 the tb2 scrolls to the same position. I use this functions:

[DllImport("user32.dll")]
static extern int SetScrollPos(IntPtr hWnd, int nBar, int nPos, bool bRedraw);

[DllImport("user32.dll")]
public static extern int GetScrollPos(IntPtr hwnd, int nBar);

That works fine but

int pos = GetScrollPos(tb1.Handle, 1);
SetScrollPos(tb2.Handle, 1, pos, true);

only sets the scrollbar to the same position but down update the text in there. tb2.Update() oder Refresh won't work...

Please help. Ty

Answer 1

I found answer

[DllImport("user32.dll")]
static extern int SetScrollPos(IntPtr hWnd, int nBar,
                int nPos, bool bRedraw);

[DllImport("User32.Dll", EntryPoint = "PostMessageA")]
static extern bool PostMessage(IntPtr hWnd, uint msg, int wParam, int lParam);



public void ScrollTo(int Position) {
    SetScrollPos((IntPtr)textBox1.Handle, 0x1, Position, true);
    PostMessage((IntPtr)textBox1.Handle, 0x115, 4 + 0x10000 * Position, 0);
}