Collection of Classes --

Hi

I have a two classes which are inherited from one class. I want to make collection of all derived classes in one list.
And when i enumrate thro that collection i should able to call correct method of that class.

For ex --

class Bbase
{
   // public member, method ....
   public virtual void Method1()
    {
    }
}

class derived1 : Bbase
{
   public new void Method1()
   {
   }
   public void Method1_1()
   {
   }
}


class derived1 : Bbase
{
   public new void Method1()
   {
   }
   public void Method2_1()
   {
   }
}



// Main function is something like that ...
Main()
{
   ArrayList  oArray;
   derived1  ob1, ob2, ob3;
   derived2   o1, o2;
   int i;

   Bbase oBase;
   oArray = new ArrayList();
   
  // Added all these object in collection
   ob1 = new derived1();
   ob2 = new derived1();
   ob3 = new derived1();
   o1 = new derived2();
   o2 = new derived2();
   oArray.Add(ob1);
   oArray.Add(ob2);
   oArray.Add(ob3);
   oArray.Add(o1);
   oArray.Add(o2);
 

  // Interate thro array.
  for ( i = 0; i < oArray.Count; i ++)
  {
     oBase = (Bbase)oArray[i];
     oBase.Method1();  // Always calls Base - method1.

    // To make it correct

   if (oArray[i].GetType().Name == "derived1")
        oDerived1 = (dervied1)oArray[i];
        oDervied1.Method1();
   else if (oArray[i].GetType().Name == "derived2")
        oDerived2 = (dervied2)oArray[i];
        oDervied2.Method1();
   
  }
}

In above code , i type cast the array object. I want to do that without typecasting .... Is it possible ??

Regards & Thanks.