How to Syntax Highlight in a RichTextBox [C#]?

Question

How do I syntax highlight in a richtextbox control AS THE USER TYPES and USING A String[] keywords. I will be publishing a lightweight notepad to the web soon

Answer 1

Are you using WinForms or WPF?

If WPF, you could have a look at AvalonEdit. It's free and open source, and it's used in SharpDevelop (open source IDE).