When is it best to use static functions in ASP.NET?

Question

I have been wondering, when to use static functions, and when not to in ASP.NET?

What are the advantages and disadvantages in using them, in various aspects like perform

Answer 1

The only major disadvantage to a static method is that it's almost entirely non-unit testable. Users of the method have to bind to the concrete method and cannot bind to an abstraction, thus making faking or mocking difficult if not impossible.

This may or may not be an issue, depending on the code, however.

The other thing you want to watch out for is that static data is universal across all requests to the server.