using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var collection = new System.Collections.Concurrent.BlockingCollection<int>();

        collection.Add(1);

        collection.Add(2);

        collection.Add(3);

        collection.Add(4);

        collection.Add(5);

        collection.Take(3); //will not compile without using System.Linq;

        collection.Dump();

    }

}