public void EditSlide(Slide element, string username, string password)
 {
     IManager<Slide> business = new SlideBusiness();
     business.Edit(element, username, password);
 }
 public int AddSlide(Slide element, string username, string password)
 {
     IManager<Slide> business = new SlideBusiness();
     return business.Add(element, username, password);
 }