using System;

using System.Collections.Generic;

using System.Text;

using System.Web;

public class Program

{

    public static void Main()

    {

        var queryParams = new Dictionary<string, string>();

        queryParams.Add("a","asda");

        queryParams.Add("s","https://nj.betamerica.com/sports/");

        Console.WriteLine(toQueryString(queryParams));      

    }

    public static string toQueryString(Dictionary<string, string> qsp ){

        var sb=new StringBuilder();

        foreach( KeyValuePair<string, string> kvp in qsp )

        {

            sb.AppendFormat("&{0}={1}", HttpUtility.UrlEncode(kvp.Key), HttpUtility.UrlEncode(kvp.Value));

        }   

        return sb.ToString();

    }

}