constructors & Destructors order

Creating A
Creating B
Creating C
Object Created 
Press enter to Destroy it
Destroying C
Destroying B
Destroying A

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using System;
class A
{
 public A()
 {
  Console.WriteLine("Creating A");
 }
 ~A()
 {
  Console.WriteLine("Destroying A");
 }
}

class B:A
{
 public B()
 {
  Console.WriteLine("Creating B");
 }
 ~B()
 {
  Console.WriteLine("Destroying B");
 }

}
class C:B
{
 public C()
 {
  Console.WriteLine("Creating C");
 }

 ~C()
 {
  Console.WriteLine("Destroying C");
 }
}
class App
{
 public static void Main()
 {
  C c=new C();
  Console.WriteLine("Object Created ");
  Console.WriteLine("Press enter to Destroy it");
  Console.ReadLine();
  c=null;
  //GC.Collect();
  Console.Read();
 }

}