public void GetAllCustomFields()
        {
            QaseAPI qaseAPI = new QaseAPI("https://api.qase.io/v1", "your api token");

            try
            {
                BaseFilter filter = new BaseFilter();

                var customFields = qaseAPI.GetAllCustomFieldsAsync("TEST", filter).Result;
            }
            catch (WebApiException ex)
            {
            }
            catch (ApiException ex)
            {
            }
            catch (Exception ex)
            {
            }
        }