easy way to format numbers to strings?

easy way to format numbers to strings?

In C#, I'd like to convert some numbers to strings in a standard format, but preferably in a simple way, such as if you were going to output them rather than store them in string variables, a la:

Console.WriteLine ("{0:F2}", num);

rather than use a bunch or string methods to make them all the same number of significant digits. Isn't there any way to do this?