using System;

using System.Web;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(GetUrl("http://example.org?wID=xxx&qwID=yyy"));

    }

    /// <summary>

        /// Extension method to evaluate the url token for wid

        /// </summary>

        /// <param name="rawUrl">Incoming URL</param>

        /// <returns>Expected URL</returns>

        public static string GetUrl(string rawUrl)

        {

            if (string.IsNullOrWhiteSpace(rawUrl))

            {

                return string.Empty;

            }

            var uriBuilder = new UriBuilder(rawUrl);

            var queryString = HttpUtility.ParseQueryString(uriBuilder.Query);

            queryString.Set("wID", "[[WID]]");

            uriBuilder.Query = queryString.ToString();

            return uriBuilder.Uri.ToString();

        }

}