Click here to Skip to main content
15,123,540 members
Articles / Programming Languages / C#
Posted 8 Jan 2008


161 bookmarked

Advanced Text Editor with Ruler

Rate me:
Please Sign up or sign in to vote.
4.85/5 (46 votes)
20 Mar 2008CPOL3 min read
Extending RichTextBox with ruler and much more


About two years ago I was creating a project for university. It was a complex of five programs that were related to testing (checking knowledge I mean). One of them contained a text editor. But unfortunately, I didn't know how to do that, that's why it was very simple. So, after these two years, I decided to rewrite my program in C# .NET (initially, it was written in VB.NET) and create a new powerful text editor. You can see part of it here.


I spent a lot of time(!) searching the Internet for controls like this, but the best ones are shareware and others did not fit my needs. So, what does this control have? I tried to make it look like Microsoft Word and I think that there are some similarities. The ruler lets you change the following: left and right margins, left indent, hanging indent and right indent. You also can disable margins (their values are set to 1). You can see how it looks in the picture above.

Also, you can add tabs by clicking on the control with the left mouse button. But it is allowed only inside the area bounded by margins. If you want to remove a tab, just drag it off from the control.

The editor lets you use lists, underline styles, advanced char styles (you can create your own links, that are not words starting with "http://" or even "www"), OLE functionality is also available. I want to thank Oscar Londoño for his article Inserting Images into a RichTextBox Control (The OLE Way). It helped me a lot to deal with OLE. This project contains his code.

Using the Code

You can use the code according to the CPOL.

Projects are created as Windows Applications, but you can easily convert them into *.dll or just embed code into your project.

Unfortunately, I removed Visual Studio 2005, so, sorry but I can't create and upload a Visual Studio 2005 project. But you can import all required files into a Visual Studio 2005 project without any problems. However, note that Visual Studio 2008 added some new namespaces (like LINQ) that Visual Studio 2005 does not "understand". Just remove them. That's all. You are ready.

Points of Interest

One thing that shocked me is that Microsoft has released RichTextBox 6.0! (It is distributed with Microsoft Office 2007) but... with one exception. There is no documentation about its features. All that I've found is a list of added functions. You can find it here. There are also descriptions for all released versions of RichTextBox.


  • 7 January 2008: Initial release
  • 16 January 2008: Projects for Visual Studio 2005 and 2008 posted instead of standalone control.
  • 26 January 2008: Posted completed AdvancedTextEditor project. It is available for Visual Studio 2005 and Visual Studio 2008.
  • 10 February 2008: Fixed PrintDialog bug. It didn't receive focus when shown. Now it's OK. Thanks to Chris Schucker for bug report and recommendations.
  • 22 February 2008: Added new functionality (full text justification, underline styles and colors and other)
  • 24 February 2008: Fixed bug with conversion from millimeter to pixel and vice versa Thanks to Chris Schucker. Also corrected bug which caused incorrect display of the indents.
  • 19 March 2008: Version 2.0 released. A lot of changes including lists, OLE, underline styles, etc.


I understand that I am not able to include everything into the control, that's why you can freely add something useful or change code to fit your needs. But, please inform me about that, just email me at It's just to let anyone use an upgraded (and corrected) version of that control. Of course, advisors will be mentioned.


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


About the Author

Aleksei Karimov
Kazakstan Kazakstan
Currently I am studying at East Kazakhstan State Technical University. My future occupation is engineer-programmer.

I use Visual Basic, C#, Delphi and a little C++. Also I am interested in using SQL and Perl.

Comments and Discussions

AnswerRe: Bug found: Doesn't work in X64 platform Pin
Alva Chien1-Nov-09 6:43
MemberAlva Chien1-Nov-09 6:43 
GeneralRe: Bug found: Doesn't work in X64 platform Pin
Aleksei Karimov5-Oct-10 21:43
MemberAleksei Karimov5-Oct-10 21:43 
GeneralGreat job just one thing... Pin
ccr0520-Sep-09 8:17
Memberccr0520-Sep-09 8:17 
QuestionRuler & Zoom Pin
Anthony Daly19-Aug-09 2:26
MemberAnthony Daly19-Aug-09 2:26 
QuestionGreat project, but... Spell check?? Pin
Anthony Daly11-Aug-09 11:01
MemberAnthony Daly11-Aug-09 11:01 
AnswerRe: Great project, but... Spell check?? Pin
Aleksei Karimov12-Aug-09 7:42
MemberAleksei Karimov12-Aug-09 7:42 
GeneralRe: Great project, but... Spell check?? Pin
Anthony Daly13-Aug-09 1:02
MemberAnthony Daly13-Aug-09 1:02 
GeneralGood project Pin
aldo hexosa13-Jul-09 18:16
professionalaldo hexosa13-Jul-09 18:16 
I like your control. thanks
GeneralRe: Good project Pin
Aleksei Karimov12-Aug-09 7:43
MemberAleksei Karimov12-Aug-09 7:43 
QuestionVB2005 Pin
alpedo2-Apr-09 7:47
Memberalpedo2-Apr-09 7:47 
AnswerRe: VB2005 Pin
alpedo3-Apr-09 15:14
Memberalpedo3-Apr-09 15:14 
QuestionA minor bug in your control any idea how to fix Pin
Brian Cohen25-Mar-09 6:09
MemberBrian Cohen25-Mar-09 6:09 
AnswerRe: A minor bug in your control any idea how to fix Pin
Aleksei Karimov27-Mar-09 5:07
MemberAleksei Karimov27-Mar-09 5:07 
GeneralRe: A minor bug in your control any idea how to fix Pin
Brian Cohen1-Apr-09 2:38
MemberBrian Cohen1-Apr-09 2:38 
GeneralRe: A minor bug in your control any idea how to fix Pin
frankelman4-Jun-09 22:18
Memberfrankelman4-Jun-09 22:18 
GeneralRe: A minor bug in your control any idea how to fix Pin
Brisingr Aerowing4-Jun-12 5:35
professionalBrisingr Aerowing4-Jun-12 5:35 
AnswerRe: A minor bug in your control any idea how to fix Pin
Michał Orlik16-Jun-09 7:12
MemberMichał Orlik16-Jun-09 7:12 
GeneralRe: A minor bug in your control any idea how to fix Pin
Brian Cohen16-Jun-09 9:38
MemberBrian Cohen16-Jun-09 9:38 
QuestionHyperlinks in Advanced Text Editor Pin
frankelman4-Jan-09 2:32
Memberfrankelman4-Jan-09 2:32 
AnswerRe: Hyperlinks in Advanced Text Editor Pin
Aleksei Karimov5-Jan-09 0:21
MemberAleksei Karimov5-Jan-09 0:21 
GeneralRe: Hyperlinks in Advanced Text Editor Pin
frankelman9-Jan-09 9:48
Memberfrankelman9-Jan-09 9:48 
QuestionSetting Ruler Margins, Indentations [modified] Pin
Tristan Baron19-Dec-08 2:52
MemberTristan Baron19-Dec-08 2:52 
GeneralUnable to set rtf property by code Pin
Michael Hachen10-Sep-08 3:12
MemberMichael Hachen10-Sep-08 3:12 
GeneralRe: Unable to set rtf property by code Pin
Aleksei Karimov10-Sep-08 6:29
MemberAleksei Karimov10-Sep-08 6:29 
GeneralRe: Unable to set rtf property by code Pin
Michael Hachen11-Sep-08 2:58
MemberMichael Hachen11-Sep-08 2:58 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.