using System;

using System.Text.Encodings.Web;

public class Program

{

    public static void Main()

    {

        string query = "Hellö Wörld@Some lang$!*()+;";

        string encodedQuery = UrlEncoder.Default.Encode(query);

        // Hell%C3%B6%20W%C3%B6rld@Some%20lang$!*()%2B;

        Console.WriteLine(encodedQuery);

        // Hell%C3%B6%20W%C3%B6rld%40Some%20lang%24%21%2A%28%29%2B%3B

        Console.WriteLine(Uri.EscapeDataString(query));

    }

}