C# Editor?

Good morning, I started to develop an application using C# while I was home. But now I am in College and I am using an old computer... So I wonder if you know of any C# editor I can use to simply add and modify code? (I don't want to use NotePad but I will if I have to) Any suggestions?

Thanks!

www.icsharpcode.net

Thanks, Cander, I also found Antechinus C# Editor