Question

I have seen that you can either do

using System.IO

and use

Path.GetDirectoryName(blah blah)

OR directly use

System.IO.Path.GetDirectoryName(blah blah);

Is there any difference between them from a point of performance?

Does using System.IO loads all static classes in the namespace to the memory resulting in using more memory or is the framework is intelligent enough to avoid that? If yes, how?

Or is this all just used to avoid naming collisions between objects across namespaces?

Any insight would be greatly appreciated 🙂

Answer 1

No, they compile to the same IL. It’s purely a matter of the source code – it’s generally more readable to use the short name rather than the fully qualified one.

The compilation results will be identical either way.