Method Overriding

• When the method that is defined in the parent class is redefined by the method of the child class we say that the method has been overriding
• For method overriding the methods should have the exact same signature (Method name, No. of Parameters and Parameter Type)
• For making a method overridable in the child class the parent class method needs to be marked with the virtual or abstract keyword and the new method that will be declared in the child class should be defined with the override keyword

using System;
using System.Collections.Generic;
 
namespace MethodOverriding
{
		public class Canvas
		{
			public void DrawShapes(List<Shape> shapes)
			{
				foreach (var shape in shapes)
				{
					shape.Draw();
				}
			}
		}
 
		public class Circle : Shape
		{
			public override void Draw()
			{
				Console.WriteLine("Drawing Circle");
			}
		}
 
		public class Rectangle : Shape
		{
			// Overridden Method
			public override void Draw()
			{
				Console.WriteLine("Drawing Rectangle");
			}
		}
 
		public class Shape
		{
			public int Width { get; set; }
			public int Height { get; set; }
 
			// Parent class Method
			public virtual void Draw()
			{
				Console.WriteLine("Parent Draw Method");
			}
		}		
 
		class Program
		{
			static void Main(string[] args)
			{
				List<Shape> shapes = new List<Shape>();
				shapes.Add(new Circle());
				shapes.Add(new Rectangle());
 
				Canvas canvas = new Canvas();
				canvas.DrawShapes(shapes);
			}
		}
}