public List<GeographicalSearchResult> GetAreaSearchResults(string search_text, int polygon_area_type_id,
            string parent_areas_to_include_in_results = "", bool include_coordinates = true)
        {
            try
            {
                NameValueCollection nameValues = new NameValueCollection();
                nameValues.Add(ParameterNames.Text, search_text);
                nameValues.Add(ParameterNames.PolygonAreaTypeId, polygon_area_type_id.ToString());
                nameValues.Add(ParameterNames.ParentAreaTypesToIncludeInResults, parent_areas_to_include_in_results);
                nameValues.Add(ParameterNames.AreEastingAndNorthingRequired, include_coordinates.ToString());

                var parameters = new AreaLookupParameters(nameValues);
                return new JsonpBuilderAreaLookup(parameters).GetGeographicalSearchResults();
            }
            catch (Exception ex)
            {
                Log(ex);
                throw;
            }
        }
 public JsonpBuilderAreaLookup(AreaLookupParameters parameters)
 {
     _parameters = parameters;
 }