This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
The upside of TextPad is that in addition to providing syntax highlighting, you can also compile and run programs from within it. Also, you can use it with other languages such as Java, Python and Perl.
The downside is that it costs $40.
<a href="http://www.catb.org/~esr/faqs/smart-questions.html" target="_blank" rel="nofollow">How To Ask Smart Questions</a>
".NET Studio." - a open source editor for .NET is SharpDevelop. I'm guessing that becasue .NET supports C++, it should then support C. You may be able to write C code and complie with the .NET C++ tools. (Could be wrong here!)