AllegroGraphCSharpClient.Repository.evalSparqlQuery C# (CSharp) Method

        public List<Results> evalSparqlQuery(string url, string query, bool infer, List<NameValuePairs> contexts, List<NameValuePairs> namedContexts, List<NameValuePairs> bindings, string AdditonalPrefixes)
        {
            query = System.Web.HttpUtility.UrlEncode(@"PREFIX rdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>  PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>  PREFIX wikipedia:<http://wikipedia.org/>  PREFIX foaf:<http://xmlns.com/foaf/0.1/>   PREFIX xsd:<http://www.w3.org/2001/XMLSchema#> PREFIX fn:<http://www.w3.org/2005/xpath-functions#>  PREFIX dc:<http://purl.org/dc/elements/1.1/>  PREFIX bio:<http://purl.org/vocab/bio/0.1/>  ")+ System.Web.HttpUtility.UrlEncode(AdditonalPrefixes) + System.Web.HttpUtility.UrlEncode(query);
            List<Results> results = new List<Results>();
            List<NameValuePairs> options = new List<NameValuePairs>();
            try
            {
                options.Add(new NameValuePairs("query",query));
                if (this._environment != null)
                {
                    options.Add(new NameValuePairs("enviornment", this._environment));
                }
                if (namedContexts != null)
                {
                    options.Add(new NameValuePairs("namedContext", namedContexts[0].Value));
                }
                if (bindings != null)
                {
                    options.Add(new NameValuePairs("bind", bindings));
                }
                if (infer)
                {
                    options.Add(new NameValuePairs("infer",infer));
                }
                if (contexts != null)
                {
                    foreach (NameValuePairs np in contexts)
                    {
                        options.Add(np);
                    }
                }
                if (url == string.Empty)
                {
                    return StandardRequest("GET", this._url, options, null);

                }
                else
                {
                    return StandardRequest("GET", url, options, null);
                }

            }
            catch (Exception ex)
            {

                System.Diagnostics.Trace.WriteLine("Error in evalSparqlQuery " + ex.Message);
            }
            return results;
        }