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How to change scrollbars position in a multiline textbox

, 29 Jun 2005
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A way to control a textbox's scrollbars position.

Introduction

I have discovered a nice way to control multi-line textbox's scrollbars in C#. Here we can force the textbox's scrolls down to the end of the text, when we are showing the log file contents dynamically.

The code

First, we have to define a constant value:

const int EM_LINESCROLL = 0x00B6;

Then, we have to declare two external methods of user32.dll:

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

Finally, use these methods to do the real thing:

SetScrollPos(myTextBox.Handle,1,myTextBox.Lines.Length-1,true);
SendMessage(myTextBox.Handle,EM_LINESCROLL,0,
                             myTextBox.Lines.Length-1);

Done! Simple and easy!

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Carlos Eugênio X. Torres
Web Developer
Portugal Portugal
View my bio at http://www.carloseugeniotorres.com

Comments and Discussions

 
QuestionMoving vertical scrollbar to the end of multi-line text box problem??? Pinmemberbishnupatro11-Feb-08 20:37 

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