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Which is more readable is quite a subjective question, however if you ask me I choose the first option. There's however something that bothers me more. You should never allow a potential exception to propagate in your code (this is returning null, you'll find yourself asking again if x is null, and what if you forget once???). You should handle this null value responsible or throw an ArgumentNullException(). A good approach as I see it could be returning object, since nearly everything in C# inherits from object, as you do in your second choice. You can read more here.