private async Task OpenCloseCameraAsync() { if (OpenCloseCameraOperation == "open camera") { AsynCallResult result = await _sdkService.OpenCamera(SelectedCamera); if (!HasErrorMsg(result.m_rc.ToString(), result.m_message)) { OpenCloseCameraOperation = "close camera"; } } else { AsynCallResult result = await _sdkService.CloseCamera(); if (!HasErrorMsg(result.m_rc.ToString(), result.m_message)) { OpenCloseCameraOperation = "open camera"; } } }