Check out example codes for "doest all the methos in interface need to implement c#". It will help you in understanding the concepts better.

Code Example 1

You have two choices:

- implement every method required by the interface
or
- declare the missing methods abstract in your class. This forces you
to declare your class abstract and, as a result, forces you to
subclass the class (and implement the missing methods) before you
can create any objects.

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