Should the inherited class be in the same cs file of the base class?

Question

I started to learn about inheritance and I was wondering where should I write the derived class. Should it be in the same .cs file as the base class or another .cs file? What is the consensus or norm about this? Does it even matter?

Answer 1

Personally, I almost always put my derived class in a different files. But, if you use inner class in your code, it's ok to be in the same file. The point is here, Single Responsibility Principle. By that;

• Reading your code takes less effort.
• You can simply check multiple classes in different windows at the same time.

Also check Multiple classes in a single .cs file - good or bad?