Checking for string contents? string Length Vs Empty String

Question

Which is more efficient for the compiler and the best practice for checking whether a string is blank?

1. Checking whether the length of the string == 0

Answer 1

Actually, IMO the best way to determine is the IsNullOrEmpty() method of the string class.

http://msdn.microsoft.com/en-us/library/system.string.isnullorempty.

Update: I assumed .Net, in other languages, this might be different.