Generate `x-www-form-urlencoded` content in C#

FormUrlEncodedContent.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Text;

namespace FormUrlEncodedContentExample
{
    class Program
    {
        static void Main(string[] args)
        {
            var dict = new Dictionary<string, string>
            {
                { "page", "kantlista" },
                { "kod", "A0004n" },
                { "termin", "H12" },
                { "anmkod", "17113" },
                { "urval", "ant" },
                { "listVal", "namn" },
                { "method", "Sök" } // S%F6k
            }; // dict

            var content = new FormUrlEncodedContent(dict);
            var memStream = new MemoryStream();
            content.CopyToAsync(memStream).Wait();
            byte[] data = memStream.GetBuffer();
            var str = Encoding.UTF8.GetString(data);
            Console.WriteLine(str);
        }
    }
}