private void SelectionChanged(object obj)
{
if (obj != null)
{
if (obj is CheckableCardModel)
{
var card = obj as CheckableCardModel;
if (card == null)
{
return;
}
if (!card.IsChecked && AllCards.Count(x => x.IsChecked) == this._notification.CardsCount)
{
return;
}
card.IsChecked = !card.IsChecked;
}
}
}