Do you know that issue, when a program could do a small job pretty quickly and you setup a new C# Project in Visual Studio, hack some stuff in, run it and never touch that project again?

Then LINQPad is the right thing for you! You can run C# Code without setting up a whole project and get your results in a sexy textbox. Check it out, it's absolutely worth it!

Edit: I really don't know why every recommendation I write sounds like an advertisement. I'm not even paid for anything I write here...