String.Format("{0}", "formatting string"};

I can never remember all the options for string formatting, particularly the ability to 'pad' strings - in the past I've written padding methods in C# because I didn't know about the format specifier!

idunno.org: String.Format("{0}", "formatting string"}; has a good reference for the most common format specifiers...

idunno.org also has a good reference for accessing IndexServer from .NET.