using System;
class BaseClass {
// Create virtual method in the base class.
public virtual void who() {
Console.WriteLine("who() in BaseClass");
}
}
class Derived1 : BaseClass {
// Override who() in a derived class.
public override void who() {
Console.WriteLine("who() in Derived1");
}
}
class Derived2 : BaseClass {
// This class does not override who().
}
class MainClass {
public static void Main() {
BaseClass baseOb = new BaseClass();
Derived1 dOb1 = new Derived1();
Derived2 dOb2 = new Derived2();
BaseClass baseRef; // a base-class reference
baseRef = baseOb;
baseRef.who();
baseRef = dOb1;
baseRef.who();
baseRef = dOb2;
baseRef.who(); // calls BaseClass's who()
}
}
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