using System;

using System.Collections.Specialized;

​

public class Program

{

    public static void Main()

    {

        // this compiles

        /*

        NameValueCollection nvc = new NameValueCollection();

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

        nvc.Add("hello", "world");

        */

        // but this doesn't compile

        NameValueCollection nvc = new NameValueCollection()

        {

            ["foo"] = "bar",

            ["hello"] = "world"

        };

​

        foreach (string name in nvc)

        {

            Console.WriteLine(nvc[name]);

        }

    }

}