public void AddItem(STEMProgram product, int quantity) { CartLine line = lineCollection .Where(p => p.Product.STEMProgramId == product.STEMProgramId) .FirstOrDefault(); if (line == null) { lineCollection.Add(new CartLine { Product = product, Quantity = quantity }); } else { line.Quantity += quantity; } }
public void RemoveLine(STEMProgram product) { lineCollection.RemoveAll(l => l.Product.STEMProgramId == product.STEMProgramId); }