public void AddItem(string item, short qty, string unit, decimal price)
{
if (detail == null)
{
detail = new[] { new OrderLine()
{
name = item, qty = qty, unit = unit, price = price
} };
}
var orderln = detail.Find(o => o.name.Equals(item));
if (orderln != null)
{
orderln.qty += qty;
}
else
{
detail = detail.AddOf(new OrderLine()
{
name = item, qty = qty, unit = unit, price = price
});
}
}