public string OpenAddAvailablePlaystations()
 {
     List<string> allItems = DataBaseClasses.DataBaseClass.Instancedb().GetAllTablesNames();
     var madts = new MultipleAddingDataToString(allItems);
     madts.ShowDialog();
     return madts.Result;
 }
 public string OpenAddItemRequirements()
 {
     List<string> allItems = DataBaseClasses.DataBaseClass.Instancedb().GetAllItemsNames();
     var madts = new MultipleAddingDataToString(allItems);
     madts.ShowDialog();
     return madts.Result;
 }