public void CartDelProduct(SaleViewModel product)
{
this.Products.Remove(product);
this.TotalWithoutDiscount -= product.totalWithoutDiscount;
this.Discount -= product.discount;
this.Total -= product.total;
}
public void CartAddProduct(SaleViewModel product)
{
this.Products.Add(product);
this.TotalWithoutDiscount += product.totalWithoutDiscount;
this.Discount += product.discount;
this.Total += product.total;
}