public Guid AddSlider(AddSliderCommand command)
    {
      var data = new Slider()
      {
        SliderId = Guid.NewGuid(),
        Name = command.Name,
        Description = command.Description,
        Type = 1,
        ImageURL = command.ImageURL
      };

      _sliderService.Insert(data);
      _unitOfWork.SaveChanges();
      return data.SliderId;
    }
 private void Save(SliderModel model)
 {
   if (model.SliderId == Guid.Empty)
   {
     var createCommand = new AddSliderCommand(model.Name,model.Description,model.ImageURL);
     model.SliderId = _sliderCommandService.AddSlider(createCommand);
   }
   else
   {
     var updateCommand = new EditSliderCommand(model.SliderId, model.Name, model.Description, model.ImageURL);
     _sliderCommandService.EditSlider(updateCommand);
   }
 }