private void DoFavourite(DateTime datetime)
{
MessageBox.Show("The purchase was added to favourite parchases", "Access token", MessageBoxButton.OK, MessageBoxImage.Information);
surrogatePurchase = new Surrogate<Purchase>(new PurchaseServiceProxy());
foreach (var purch in Purchases.Where(purch => purch.PurchaseDate == datetime))
{
purch.Favorite = true;
surrogatePurchase.Update(surrogatePurchase.Serialize(purch));
return;
}
}