using System;

using System.Net;

using System.Web;

​

public class Program

{

​

    public static void Main()

    {

         string encoded_uri = HttpUtility.UrlEncode("https://mstdn.jp/api/v1/apps?client_name=test&redirect_uris=https%3A%2F%2Fmstdn.jp%2Fauth%2Fsign_in");

        WebRequest request = WebRequest.Create (encoded_uri);

        Console.Write(request);

    }

}