How to Implement Polymorphisam in C#

Create a Console Application and write the following code...


 class Program
    {
        public class BaseClass  // Base class
        {
            public virtual void GetData()   // by defining Virtual, the method is going to override in Derived class
            {
                System.Console.WriteLine("From Base Class");
            }
        }

        public class DerivedClass : BaseClass
        {
       public override void GetData()  // The method has been over riden in the derived class with Override keyword
            {
                 System.Console.WriteLine("From Derived Class");
                
            }
        }

        static void Main(string[] args)
        {
         
            DerivedClass objDerive = new DerivedClass();
            objDerive.GetData();
            Console.Read();
        }
    }


If the method is not defined with Virtual, we can over ride method with NEW keyword  

Example :-

class Program
    {
        public class BaseClass
        {
            public void GetData()
            {
                System.Console.WriteLine("From Base Class");
            }
        }

        public class DerivedClass : BaseClass
        {
            public new void GetData()  // the method we have written with NEW keyword
            {
                 System.Console.WriteLine("From Derived Class");
                
            }
        }

        static void Main(string[] args)
        {
          
            DerivedClass objDerive = new DerivedClass();
            objDerive.GetData();
            Console.Read();
        }
    }