using System;

using System.Collections;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var hashSet = new HashSet<string> { "hi" };

        var hashSetIsCollection = hashSet is ICollection;

        var hashSetIsList = hashSet is IList;

        var hashSetIsCollectionObject = hashSet is ICollection<object>;

        var hashSetIsListObject = hashSet is IList<object>;

        Console.WriteLine(hashSetIsCollection);

        Console.WriteLine(hashSetIsList);

        Console.WriteLine(hashSetIsCollectionObject);

        Console.WriteLine(hashSetIsListObject);

        var list = new List<string> { "hi" };

        var listIsCollection = list is ICollection;

        var listIsList = list is IList;

        var listIsCollectionObject = list is ICollection<object>;

        var listIsListObject = list is IList<object>;

        Console.WriteLine(listIsCollection);

        Console.WriteLine(listIsList);

        Console.WriteLine(listIsCollectionObject);

        Console.WriteLine(listIsListObject);

    }

}