protected async override Task <object> OnPerform() { var reason = JsonConvert.SerializeObject(_addPropane); var content = new StringContent(reason, Encoding.UTF8, ApplicationJSON); var response = await _fuelPumpRestClient.GetFuelVolume(content); var data = await response.Content.ReadAsStringAsync(); switch (response.StatusCode) { case HttpStatusCode.OK: var volume = new DeSerializer().MapString(data); return(volume); default: return(await HandleExceptions(response)); } }