public BaseOperation() { if (AllObservers == null) { AllObservers = new Dictionary <string, List <IOperationObserver> >(); } Success = false; Message = ""; ServerLink = "http://213.246.61.49/weel-web/api/"; OperationWebClient = new HttpClient(); OperationWebClient.DefaultRequestHeaders.Add("Api-Version", "1.0"); OperationWebClient.DefaultRequestHeaders.Add("App-Version", "1.0"); OperationWebClient.DefaultRequestHeaders.Add("User-Agent", "Windows Phone"); var cultureName = new DateTimeFormatter("longdate", new[] { "US" }).ResolvedLanguage; CultureInfo cultureInfo = CultureInfo.CurrentCulture; CultureInfo currentUIInfo = CultureInfo.CurrentUICulture; if (cultureName.ToString() == "en-US") { OperationWebClient.DefaultRequestHeaders.Add("User-Lang", "EN"); } else if (cultureName.ToString() == "fr-FR") { OperationWebClient.DefaultRequestHeaders.Add("User-Lang", "FR"); } else { OperationWebClient.DefaultRequestHeaders.Add("User-Lang", "FR"); } string UniqueDeviceID = DeviceInfo.Instance.Id; OperationWebClient.DefaultRequestHeaders.Add("Device-UniqueId", UniqueDeviceID); OperationWebClient.DefaultRequestHeaders.Add("Timezone-Format", "UTC"); }