override ToString method twices : ToString « Class « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Class
3. ToString

using System;
   class BaseClass {
      int i = 5;
      public virtual void Print() {
         Console.WriteLine("i is {0}", i);
      }
      public override String ToString() {
         return i.ToString();
      }
   }
   class DerivedClass : BaseClass {
      double d = 2.1;
      public override void Print() {
         base.Print();
         Console.WriteLine("d is {0}", d);
      }
      public override String ToString() {
         return base.ToString() + " " + d.ToString();
      }
   }
   class MainClass {
      public static void Main() {
         BaseClass b = new BaseClass();
         DerivedClass d = new DerivedClass();
         BaseClass bd = new DerivedClass();  
         b.Print();                   
         d.Print(); 
         bd.Print();      
         Console.WriteLine("b: {0}, d: {1}, bd: {2}", b, d, bd);
      }
   }