Code Editor control for ASP.NET

I am aware of the Rich Text box controls, but I'd like to know if there are any controls I can use for users to enter C# code (with intellisen开发者_开发技巧se if possible)?

Thanks!

EDIT: Still looking for one

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Intellisense in a browser is a real, real tall glass of water to pour. But there are some decent syntax highlight options out there -- I'm partial to MarkItUp! myself.