Compiler Warning Query

If I analyse a project, why is it a problem that I have unused method/event parameters?

That’s not a Problem, this is only a info. You can turn off this warnings at the ‘Project->Analysis Warnings’ Dialog.

Ok thanks. Just out of interest, why do some people use #Pragma Unused VariableName then?

So when they deliberately ignore using a parameter they no longer get this particular warning
Some try to get warnings down to 0

An unused method or event parameter might mean that you forgot to do something with that parameter; on the other hand you might be ignoring the parameter on purpose. If I know that a parameter is supposed to be ignored, I tend to use the #pragma unused directive to tell the compiler so that the only warnings I see are legitimate concerns.