Do redundant casts get optimized?

Question

I am updating some old code, and have found several instances where the same object is being cast repeatedly each time one of its properties or methods needs to be called. E

Answer 1

No; FxCop flags this as a performance warning. See info here: http://msdn.microsoft.com/en-us/library/ms182271.aspx

I'd recommend running that over your code if you want to find things to fix.