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Posted 19 May 2011

Synchronized RichTextBox objects (or how to scroll 2 RichTextBox objects together)

, 22 May 2011
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In this tip, I will show how to scroll two RichTextBox objects together
In my previous post (Synchronized ListBox objects (or how to scroll 2 ListBox objects together)[^]), I described how to create synchronized (or linked) ListBox and ListView objects. Now I continue investigation in this area and I have found another interesting example which describes synchronization of two RichTextBox objects. The first step is to create a class which derives from RichTextBox class.
public class SynchronizedScrollRichTextBox : System.Windows.Forms.RichTextBox
    public event vScrollEventHandler vScroll;
    public delegate void vScrollEventHandler(System.Windows.Forms.Message message);
    public const int WM_VSCROLL = 0x115;
    protected override void WndProc(ref System.Windows.Forms.Message msg)
        if (msg.Msg == WM_VSCROLL)
            if (vScroll != null)
        base.WndProc(ref msg);
    public void PubWndProc(ref System.Windows.Forms.Message msg)
        base.WndProc(ref msg);

I created two SynchronizedScrollRichTextBox controls and placed them on the form. Then, I added the following code (vScroll event):
private void synchronizedScrollRichTextBox1_vScroll(Message message)
    message.HWnd = synchronizedScrollRichTextBox2.Handle;
    synchronizedScrollRichTextBox2.PubWndProc(ref message);


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Kanasz Robert
Architect The Staffing Edge & Marwin Cassovia Soft
Slovakia Slovakia
My name is Robert Kanasz and I have been working with ASP.NET, WinForms and C# for several years.
MCSD - Web Applications
MCSE - Data Platform
MCPD - ASP.NET Developer 3.5
- Web Developer 4
MCITP - Database Administrator 2008
- Database Developer 2008
MCSA - SQL Server 2012
MCTS - .NET Framework 3.5, ASP.NET Applications
- SQL Server 2008, Database Development
- SQL Server 2008, Implementation and Maintenance
- .NET Framework 4, Data Access
- .NET Framework 4, Service Communication Applications
- .NET Framework 4, Web Applications
MS - Programming in HTML5 with JavaScript and CSS3 Specialist

Open source projects: DBScripter - Library for scripting SQL Server database objects

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Comments and Discussions

GeneralExcellent! Pin
Jeff Schnarel5-Dec-14 10:29
memberJeff Schnarel5-Dec-14 10:29 

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