Escaping curly brackets ({) in string format

In case you wondered, you can escape curly brackets in a string.Format call by just repeating the brackets.  For example, the following:

Console.WriteLine( string.Format( "{{0}}-{0}", 42 ) );

will output:

{0}-42

I needed to do this to use Format to create a string I intended to pass to another Format method.   More examples are in a blog post here.