using System;

// Define a reference type that does not override Equals.

public class Person

{

   private string personName;

   public Person(string name)

   {

      this.personName = name;

   }

   public override string ToString()

   {

      return this.personName;

   }

}

public class Example

{

   public static void Main()

   {

      Person person1a = new Person("John");

      Person person1b = person1a;

      Person person2 = new Person(person1a.ToString());

      Console.WriteLine("Calling Equals:");

      Console.WriteLine("person1a and person1b: {0}", person1a.Equals(person1b));

      Console.WriteLine("person1a and person2: {0}", person1a.Equals(person2));  

      Console.WriteLine("\nCasting to an Object and calling Equals:");

      Console.WriteLine("person1a and person1b: {0}", ((object) person1a).Equals((object) person1b));

      Console.WriteLine("person1a and person2: {0}", ((object) person1a).Equals((object) person2));

   }

}

// The example displays the following output:

//       person1a and person1b: True

//       person1a and person2: False

//

//       Casting to an Object and calling Equals:

//       person1a and person1b: True

//       person1a and person2: False