What is this {0} thing?

[Guest]

I'm sorry, this is probably a beginner .NET thing, but I never learned it.
What is this {0} or {1} stuff in Strings? I don't understand them.

 

[Tim Wilson]

They're placeholders/formatters for string substitution. See the example at
the link below.
http://msdn.microsoft.com/library/d...f/html/frlrfsystemstringclassformattopic1.asp