Difference between new and override

Question

Wondering what the difference is between the following:

Case 1: Base Class

public void DoIt();

Case 1: Inherited class

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Answer 1

The difference between the two cases is that in case 1, the base DoIt method does not get overridden, just hidden. What this means is that depending on the type of the variable depends on which method will get called. For example:

BaseClass instance1 = new SubClass();
instance1.DoIt(); // Calls base class DoIt method

SubClass instance2 = new SubClass();
instance2.DoIt(); // Calls sub class DoIt method

This can be really confusing and results in non expected behaviour and should be avoided if possible. So the preferred way would be case 2.