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C#
You're learning C# well there are some good articles and tutorials on this site: http://www.cprogramming.com/ I go there for C++ tutorials. It has good examples, and in-depth results. Here's another site: http://cplus.about.com/od/learnin2/l/aa020804a.htm Hope this helped.
Just pickup the O'Reilly book on C# and .NET Applications. It's well worth the investment if you're serious about it.
While you're at it, pickup Visual Studio 2005 and learn .NET 2. BUY the software, don't pirate it. At worst, download the free Express edition. For 50$, you can get Visual Studio 2005 with the Student discount at academicsuperstore.com.