private async Task CheckAuthorizationToDeliver()
{
Delivery_man d1 = (Delivery_man)await myHttpClient.sendHttpGetAsyncObject <Delivery_man>(Constants.ApiGetDeliveryManById + "?id_delivery_man=" + App.deliveryMan.id_delivery_man);
if (!d1.authorized)
{
MyHelper.RemoveAllSavedValuesForApp();
NavigationPage np = new NavigationPage(new SignInPage());
MainPage = np;
}
}