C#

[DllImport("user32.dll")]
private void SendMessage(IntPtr hWnd, int msg, int wParam, ref POINT lParam);
private struct POINT // inner struct in this example, but doesn't have to be
{
  public long x;
  public long y;
}
private const int EM_GETSCROLLPOS = 1245;
private const int EM_SETSCROLLPOS = 1246;
// later, in a method somewhere...
POINT p = new POINT();
p.x = x-coordinate;
p.y = y-coordinate;
SendMessage(myRichTextBox.Handle, EM_SETSCROLLPOS, 0, ref p);

<br />
// constant definitions<br />
private const uint WM_HSCROLL = 0x0114;<br />
private const uint WM_VSCROLL = 0x0115;<br />
private const uint SB_LINEUP    = 0;<br />
private const uint SB_LINELEFT  = 0;<br />
private const uint SB_LINEDOWN  = 1;<br />
private const uint SB_LINERIGHT = 1;<br />
<br />
// scroll up by one line (this.rTB1 is the RichTextBox instance)<br />
SendMessage(this.rTB1.Handle, WM_VSCROLL, SB_LINEUP, 0);<br />
// scroll down by one line<br />
SendMessage(this.rTB1.Handle, WM_VSCROLL, SB_LINEDOWN, 0);<br />
// scroll left<br />
SendMessage(this.rTB1.Handle, WM_HSCROLL, SB_LINELEFT, 0);<br />
// scroll right<br />
SendMessage(this.rTB1.Handle, WM_HSCROLL, SB_LINERIGHT, 0);<br />
<br />
<br />
[DllImport("User32")]<br />
private static extern uint SendMessage(IntPtr hWnd, uint Msg, uint wParam, uint lParam);<br />