Possible Duplicate:
Why would you use Expression<Func<T>> rather than Func<T>?
Possibly my shortest ever SO question:
What is the benefit of declaring Expression<Func<T, bool>> over Func<T, bool>?
Possible Duplicate:
Why would you use Expression<Func<T>> rather than Func<T>?
Possibly my shortest ever SO question:
What is the benefit of declaring Expression<Func<T, bool>> over Func<T, bool>?