How does vb.net achieve polymorphism, Computer Engineering

How does VB.NET/C# achieve polymorphism?

VB.Net / C# provide polymorphism through the following mechanisms:

1. Inheritance - base class gives overridable methods which are re-executed in derived classes.

2. Interface - different class can execute same interface, resulting in dissimilar implementations of interface methods.

3. Virtual methods - achieve runtime polymorphism.

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