using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
class Program
{

static int classIndex = 0;

static void Main(string[] args)
{
ClassA<string> x1 = new ClassA<string>("I am here");
ClassA<int> x2 = new ClassA<int>(20);
ClassA<DateTime> x3 = new ClassA<DateTime>(DateTime.Now);

Console.WriteLine(x1.MyIndex);
Console.WriteLine(x2.MyIndex);
Console.WriteLine(x3.MyIndex);
}
}

public class ClassA<T>
{
public T Item
{
get;
set;
}

public int MyIndex
{
get;
set;
}

public ClassA(T source)
{
Item = source;
MyIndex = classIndex++;
}


}
}