How to have a default method while still be able to override it?

This question already has an answer here:

What is the difference between an abstract function and a virtual function? 21 answers

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You need to declare the base virtual (which means it can be overridden if necessary) and override it where you need different behavior from the original. The non-overridden derived class will behave just like the base class.

public class Parent()
{
    public virtual DataTable FetchScore()
    {
        // blahblah
    }
}

public class ChildNormal() : Parent
{
}

public class ChildOdd() : Parent
{
    public override DataTable FetchScore()
    {
        DataTable dt = base.FetchScore();
        // blahblah
    }
}

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