ToQueryString c#

private static string ToQueryString(NameValueCollection values){
   var httpCollection = HttpUtility.ParseQueryString("");
   httpCollection.Add(values);
   return httpCollection.ToString();
}

private static string ToQueryString(IDictionary<string, string> values){
   var httpCollection = HttpUtility.ParseQueryString("");
   foreach (var entry in values){
     httpCollection.Add(entry.Key, entry.Value);
   }
   return httpCollection.ToString();
}