public ProductListsViewModel()
 {
     this.session = new StorageSession();
     this.repo    = new RepositoryProductList();
     Task.Run(async() =>
     {
         await this.CargarLista();
     });
 }
 public ProductListViewModel()
 {
     this.productList = new ProductList();
     this.repo        = new RepositoryProductList();
     this.session     = new StorageSession();
 }