private async Task ExecuteUpdatePhotoCommand() { string[] updateOptions = { UIConstants.TakePhoto, UIConstants.ChooseFromGallery }; string chosenOption = await RootPage.DisplayActionSheet(UIConstants.UpdatePhoto, "Cancel", null, updateOptions); if (!string.IsNullOrEmpty(chosenOption)) { if (chosenOption.Equals(UIConstants.TakePhoto)) { await TakePhoto(); } else if (chosenOption.Equals(UIConstants.ChooseFromGallery)) { await ChoosePhoto(); } } }