using System;

​

public class testClass : IDisposable

{

    public void Dispose()

    {

    Console.WriteLine(0);

    }

}

​

//call class

public class Program

{

   public static void Main()

    {

        // Use using statement with class that implements Dispose.

    using (testClass objClass = new testClass())

    {

            Console.WriteLine(1);

    }

       {

    testClass objClass = new testClass();

    //objClass = null;

    try

    {

         Console.WriteLine(2);

    }

    finally

    {

        if (objClass != null)

        ((IDisposable)objClass).Dispose();

    }

}

    }

}