public void LoadAllDeviceTypes()
        {
            //Arrange
            ObservableCollection <DeviceType> deviceTypes = null;
            var expectedDeviceTypes = deviceTypeDataService.GetAllDeviceTypes();

            //act
            var viewModel = GetViewModel();

            deviceTypes = viewModel.DeviceTypes;

            //assert
            CollectionAssert.AreEqual(expectedDeviceTypes, deviceTypes);
        }
 private void LoadData()
 {
     DeviceTypes = deviceTypeDataService.GetAllDeviceTypes().ToObservableCollection();
 }