Platform: .NET Framework 2.0
using System; class Base { // Create virtual method in the base class. public virtual void who() { Console.WriteLine("who() in Base"); } } class Derived1 : Base { // Override who() in a derived class. public override void who() { Console.WriteLine("who() in Derived1"); } } class Derived2 : Derived1 { // This class also does not override who(). } class Derived3 : Derived2 { // This class does not override who(). } public class NoOverrideDemo2 { public static void Main() { Derived3 dOb = new Derived3(); Base baseRef; // a base-class reference baseRef = dOb; baseRef.who(); // calls Derived1's who() }