Catch Textbox Scroll Event?

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Assuming WinForms, you can try pinvoking:

public class MyRTF: RichTextBox {

  private const int WM_HSCROLL = 0x114;
  private const int WM_VSCROLL = 0x115;
  private const int WM_MOUSEWHEEL = 0x20A;

  protected override void WndProc(ref Message m) {
    base.WndProc(ref m);

    if (m.Msg == WM_VSCROLL || m.Msg == WM_HSCROLL || m.Msg == WM_MOUSEWHEEL) {
      // scrolling...
    }
  }

}

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