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Take advantage of the Northwind Data Service you created in Recipe 9-2 and add a service reference to make it available in Recipe 9-3 s Silverlight application. In UserControl_Loaded you create a DataServiceContext instance named NorthwindContext as before. You add one directive to have NorthwindContext apply changes as a batch by updating SaveChangesDefaultOptions since the insert operation affects multiple tables, as shown here: private void UserControl_Loaded(object sender, RoutedEventArgs e) { NorthwindContext = new NorthwindEntities( new Uri("DataService/NorthwindDataService.svc", UriKind.Relative)); NorthwindContext.SaveChangesDefaultOptions = SaveChangesOptions.Batch; } Next, you have a series of similar operations as in Recipe 9-1 and 9-2 where you load up three DataGrid instances with Customer data, Customer Order data, and finally the corresponding Customer Order Details data where you implement simple CRUD operations. (We don t go through the data loading code so as to not be redundant.) Essentially, when the user clicks the Load Northwind Customer Data button, it populates the Customers DataServiceCollection<Customer> instance that is databound to the top left DataGrid. The Load Customer Orders button loads the Orders that correspond to the selected Customer into the DataGrid on the upper right. The same process is implemented to load up the corresponding Order_Details in the DataGrid on the lower right. At this point, you have the data that

you want to perform edits on in the Order_Details data. Next, add a UI for making edits with buttons that correspond to deleting, updating, and creating an Order_Details entity, as shown in figure 9-7.

Figure 9-7. The UI for Recipe 9-3

To load the data, simply clicked the Load Northwind Customer Data button, followed-by the Load Customer Orders button, and finally the Load Customer Order Details button. You can select a particular record before clicking the next step if desired to test it out but you must click the buttons in that order for the simple UI to function. The Delete Selected Line Item button does what it suggests: it deletes the selected Order_Details record in the Customer Order Details DataGrid. Here is the event handler for the button: private void DeleteDetailsItemBtn_Click(object sender, RoutedEventArgs e) {

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Note The vbox component is used to create a vertically oriented box. Added components will be placed underneath each other in a column.

if (CustomerOrderDetailsDataGrid.SelectedItem != null) { NorthwindContext.DeleteObject( (Order_Detail)CustomerOrderDetailsDataGrid.SelectedItem); NorthwindContext.BeginSaveChanges( SaveChangesOptions.Batch, ChangesSaved, NorthwindContext); } } Since you have the Order_Details object to be deleted already on the client as part of the CustomerOrderDetails DataServiceCollection<Order_Detail> collection, you can simply pass in the DataGrid SelectedItem to DeleteObject and all of the change tracking magic on the client takes care of the rest. However, to push the changes to the server, call BeginSaveChanges on the NorthwindContext object which knows where the WCF Data Service lives and how to apply the changes. The code to perform the update operation is a little bit more complicated but not much more. Here is the code: private void UpdateDetailsItemBtn_Click(object sender, RoutedEventArgs e) { ((Order_Detail)CustomerOrderDetailsDataGrid.SelectedItem).Quantity = Convert.ToInt16(EditQuantity.Text); NorthwindContext.UpdateObject( (Order_Detail)CustomerOrderDetailsDataGrid.SelectedItem); NorthwindContext.BeginSaveChanges( SaveChangesOptions.Batch, ChangesSaved, NorthwindContext); } The code is similar except you call the NorthwindContext.UpdateObject method and pass in the modified object to complete the changes on the client and to mark the edited Order_Details entity as modified. You edit the selected Order_Details entity by updating the Quantity value to match what is entered in the EditQuantity TextBox. The code to insert a new Order_Details entity as a child to the selected Customer Order is shown here: private void InsertlineItemBtn_Click(object sender, RoutedEventArgs e) { Order_Detail od = new Order_Detail(); Order SelectedOrder = (Order)CustomerOrdersDataGrid.SelectedItem ; Product SelectedProduct = (Product)ProductsDataGrid.SelectedItem ; od.Order = SelectedOrder; od.OrderID = SelectedOrder.OrderID; od.Product = SelectedProduct; od.ProductID = SelectedProduct.ProductID; od.Quantity = Convert.ToInt16(InsertProdQuantity.Text); od.UnitPrice = (Decimal)SelectedProduct.UnitPrice;

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