public void changeView()
{
if (firstDate != null && secondDate != null && firstDate <= secondDate)
{
SourceList = new PurchaseHistoryM().GetPurchaseHistoryList(firstDate, secondDate);
}
if (firstDate > secondDate)
{
View.InvalidDates.Visibility = Visibility.Visible;
}
else
{
View.InvalidDates.Visibility = Visibility.Collapsed;
}
}
private void worker_DoWork(object sender, DoWorkEventArgs e)
{
VisibilityProgressBar = Visibility.Visible;
VisibilityListProducts = Visibility.Collapsed;
SourceList = new PurchaseHistoryM().GetPurchaseHistoryList(firstDate, secondDate);
}