Parameter Validation Best Practices

Question

Imagine you have an application which is some kind of front-end to all your business logic. This front-end has a lot of DLLs upon which it depends, and the methods in t

Answer 1

Very interesting topic :)

in general you should implement a "validation facade" lower than the user interface and at the lowest possible level commonly accessed by user interface and external services.

you can check for null and validate input also in the UI just to avoid a useless round-trip to the server, client side validation is a good practice, still you cannot trust the caller to only pass you valid values.