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Home Forums What is the difference between override, new, and virtual keywords? – MindStick
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1 Answers

Ponu Maurya
Ponu Maurya 24 Jun 2025
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In C#, the virtual, override, and new keywords are used for method overriding and hiding in object-oriented inheritance. Here's a breakdown of each:

virtual

  • Used in a base class to indicate that a method or property can be overridden in a derived class.
  • Allows runtime polymorphism.
public class Base
{
    public virtual void Show()
    {
        Console.WriteLine("Base Show");
    }
}

override

  • Used in a derived class to override a virtual method or property from a base class.
  • The base class must mark the member as virtual, abstract, or override.
public class Derived : Base
{
    public override void Show()
    {
        Console.WriteLine("Derived Show");
    }
}

 new

  • Used to hide a base class member without overriding it.
  • Does not support polymorphism — the method called depends on the reference type, not the object type.
public class Derived : Base
{
    public new void Show()
    {
        Console.WriteLine("Derived Show (new)");
    }
}

Example to Illustrate the Difference

Base obj = new Derived();
obj.Show(); // What gets called?

Output:

  • If Show() is overridden using override, output: "Derived Show"
  • If Show() is hidden using new, output: "Base Show" (because obj is a Base reference)

Summary Table

Keyword Where Used Purpose Supports Polymorphism?
virtual Base class Marks a method as overridable Yes
override Derived class Overrides a virtual/abstract method Yes
new Derived class Hides base class method (not override) No
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