Introduction

In this lesson, you will learn polymorphism in C# for beginners. Polymorphism allows methods to behave differently based on input or object type.

What is Polymorphism?

Polymorphism means “many forms”. It allows the same method name to perform different tasks.

Types of Polymorphism in C#

Method Overloading (Compile-time)

Same method name with different parameters.

class Math
{
    public int Add(int a, int b)
    {
        return a + b;
    }

    public int Add(int a, int b, int c)
    {
        return a + b + c;
    }
}

Method Overriding (Run-time)

Child class changes the behavior of parent class method.

class Animal
{
    public virtual void Sound()
    {
        Console.WriteLine("Animal sound");
    }
}

class Dog : Animal
{
    public override void Sound()
    {
        Console.WriteLine("Dog barks");
    }
}

Real-World Use

• Payment methods (UPI, Card, Cash)
• Different user roles in apps
• Same function, different behavior

Key Points

• Polymorphism improves flexibility
• Same method can have different implementations
• Used in real-world applications

Internal Links

• Course Page: .NET Course for Beginners