public PageCheckOut()
{
this.InitializeComponent();
//date
fromDatePicker.Date = DateTime.Today.AddDays(-3).Date;
toDatePicker.Date = DateTime.Today.Date;
var _enumval = Enum.GetValues(typeof(PurchaseStatus)).Cast <PurchaseStatus>();
purchaseStatesComboBox.ItemsSource = _enumval.ToList();
purchaseStatesComboBox.SelectedIndex = 4;
reLoadData();
productsListView.ItemsSource = QueryForSQLServer.GetProductFromDb();
}