static void Main(string[] args)  //We haven't told to the Client program that we are creating the object of Teacher Class or Student Class
        {
            Console.WriteLine("Enter Your Object Type");
            string type = Console.ReadLine();        //The value entered by user should get store under type variable
            I1     obj  = CreateObj.getObject(type); //I1 will get refernce of which class to call

            Console.WriteLine(obj.getfname());       //Creating Object through common interface
            Console.ReadLine();
        }