using System;
using System.Collections.Generic;

namespace Is
{
    class Program
    {
        static void Main(string[] args)
        {
            //List of objects that we will check the type of.
            List<object> list = getList();

            //Counters.
            int myClassCount = 0;
            int mySecondClassCount = 0;

            //We will use the "is" operator to check if a variable is of a certain type.
            foreach (var item in list)
            {
                //The is operator returns true if the object type matches up and false if it doesn't.
                if (item is MyClass)
                {
                    myClassCount++;
                }
                else if (item is MySecondClass)
                {
                    mySecondClassCount++;
                }
            }

            Console.WriteLine("There were " + myClassCount + " instances of MyClass and " + mySecondClassCount + " instances of MySecondClass in this list.");
            Console.ReadLine();
        }

        //This method returns a list filled with either MyClass or MySecondClass instances, depending on the random value.
        public static List<object> getList()
        {
            List<object> list = new List<object>();
            Random rand = new Random();

            for (int i = 0; i < 10; i++)
            {
                if (rand.Next(1, 2 + 1) > 1)
                {
                    var classObject = new MyClass();
                    list.Add(classObject);
                }
                else
                {
                    var classObject = new MySecondClass();
                    list.Add(classObject);
                }
            }
            return list;
        }

        class MyClass
        {
        }

        class MySecondClass
        {
        }
    }
}