C# 'is' operator Clarification

Question

Does the is operator indicate whether or not an object is an instance of a certain class, or only if it can be casted to that

Answer 1

is indicate if the object can be casted to a class or interface.

If you have a BaseClass and a SubClass then:

var obj = new SubClass();

obj is SubClass returns true;

obj is BaseClass also returns true;