Abstract Method

Applies to classes, methods, properties
An abstract class cannot be instantiated
An abstract class can only be used as a base class
An abstract class can contain abstract methods and properties
An abstract method or property can only be declared in abstract classes
An abstract method or property does not contain any implementation
An abstract method or property cannot be used with static, virtua or override.
Derived classes must implement these abstract methods and properties)

public abstract class Shape 
   public abstract string Name()

public class Triangle : Shape
   public override string Name()
      return "triangle";

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