Question

For my C# RichTextBox, I want to programmatically do the same thing as clicking the up arrow at the top of a vertical scroll bar, which moves the RichTextBox display up by one line. What is the code for this? Thanks!

Answer 1

Here’s what I do:

using System.Runtime.InteropServices;  [DllImport('user32.dll')] static extern int SendMessage(IntPtr hWnd, uint wMsg,                                 UIntPtr wParam, IntPtr lParam); 

then call:

SendMessage(myRichTextBox.Handle, (uint)0x00B6, (UIntPtr)0, (IntPtr)(-1)); 

Seems to work OK – you might need to tweak things a bit, though.

Hope that helps.