using System;

using System.Collections.Specialized;

public class Program

{

    public static void Main()

    {           

        var nvc = new NameValueCollection();

        nvc.Add("foo", "bar");

        nvc.Add("multiple", "first");

        nvc.Add("multiple", "second");

        Console.WriteLine(nvc["foo"]);

        Console.WriteLine(nvc["multiple"]);

    }

}