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// Add to in-memory object. inventoryDoc.Descendants("Inventory").First().Add(newElement); // Save changes to disk. inventoryDoc.Save("Inventory.xml"); } The final method, LookUpColorsForMake() will receive the data in the final TextBox to build a string that contains the colors of a specified make, using a LINQ query. Consider the following implementation: public static void LookUpColorsForMake(string make) { // Load current document. XDocument inventoryDoc = XDocument.Load("Inventory.xml"); // Find the colors for a given make. var makeInfo = from car in inventoryDoc.Descendants("Car") where (string)car.Element("Make") == make select car.Element("Color").Value; // Build a string representing each color. string data = string.Empty; foreach (var item in makeInfo.Distinct()) { data += string.Format("- {0}\n", item); } // Show colors. MessageBox.Show(data, string.Format("{0} colors:", make)); }

Now that you ve learned how to use profiles, it s worth considering an end-to-end example that uses the GridView and the profiles feature to build a basic shopping cart. Shopping carts are a hallmark of e-commerce websites. They allow users to select a batch of items for an upcoming purchase. Using profiles, you can store shopping cart information in a user s profile so that it s stored permanently for repeat visits. When the user makes the purchase, you can remove the profile information and use a database component to commit the corresponding order records. In the following sections, you ll go through the steps needed to build a complete shopping cart framework that revolves around a single test page (see Figure 24-6). This test pages uses two databound controls one to show the product catalog and one to show the shopping cart items. To add items from the catalog, the user must click a link in the product catalog.

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All you need to do at this point is fill in the details of your event handlers. Doing so is as simple as making calls to your static helper methods: public partial class MainForm : Form { public MainForm() { InitializeComponent(); } private void MainForm_Load(object sender, EventArgs e) { // Display current XML inventory document in TextBox control. txtInventory.Text = LinqToXmlObjectModel.GetXmlInventory().ToString(); }

You can also use the following model if you want to store shopping cart information in session state. You still set up the grid controls in the same way and use the same shopping cart classes. The only difference is that the shopping cart is stored temporarily in the Session collection instead of in the database through the Page.Profile property.

private void btnAddNewItem_Click(object sender, EventArgs e) { // Add new item to doc. LinqToXmlObjectModel.InsertNewElement(txtMake.Text, txtColor.Text, txtPetName.Text); // Display current XML inventory document in TextBox control. txtInventory.Text = LinqToXmlObjectModel.GetXmlInventory().ToString(); } private void btnLookUpColors_Click(object sender, EventArgs e) { LinqToXmlObjectModel.LookUpColorsForMake(txtMakeToLookUp.Text); } } Figure 24-5 shows the end result.

In theory, you could use the DataRow and DataTable objects to represent a shopping cart. However, because the shopping cart information doesn t directly correspond to a table in the database, the process would be awkward and counterintuitive. A better approach is to design your own classes to represent the shopping cart and its items. The first ingredient you need is a class to represent individual shopping cart items. This class needs to track the product information, along with the number of units the user wants to order. Here s a ShoppingCartItem class that fills this role: <Serializable()> _ Public Class ShoppingCartItem Private m_productID As Integer Public ReadOnly Property ProductID() As Integer Get Return m_productID End Get End Property Private m_productName As String Public ReadOnly Property ProductName() As String Get Return m_productName End Get End Property Private m_unitPrice As Decimal Public ReadOnly Property UnitPrice() As Decimal Get Return m_unitPrice End Get End Property Private m_units As Integer Public Property Units() As Integer Get Return m_units End Get Set m_units = Value End Set End Property Public ReadOnly Property Total() As Decimal Get Return Units * UnitPrice End Get End Property

Figure 24-5. The completed LINQ to XML application That wraps up the introductory look at LINQ to XML and your investigation of LINQ. You first encountered LINQ in 13, where you learned about LINQ to Objects. 19 showed various examples using PLINQ, while 23 showcased how you can apply LINQ queries to ADO.NET Entity objects. Using all of this information, you are in good shape to dig deeper, which you should. Microsoft has made it very clear that LINQ will continue to evolve as the .NET platform grows.

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