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Figure 16-7. Querying a product When you design this window, you don t have access to the Product object that will supply the data at runtime. However, you can still create your bindings without indicating the data source. You simply need to indicate the property that each element uses from the Product class. Here s the full markup for displaying a Product object: <Grid Name="gridProductDetails"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"></ColumnDefinition> <ColumnDefinition></ColumnDefinition> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto"></RowDefinition> <RowDefinition Height="Auto"></RowDefinition> <RowDefinition Height="Auto"></RowDefinition> <RowDefinition Height="Auto"></RowDefinition> <RowDefinition Height="*"></RowDefinition> </Grid.RowDefinitions> <TextBlock Margin="7">Model Number:</TextBlock> <TextBox Margin="5" Grid.Column="1" Text="{Binding Path=ModelNumber}"></TextBox> <TextBlock Margin="7" Grid.Row="1">Model Name:</TextBlock> <TextBox Margin="5" Grid.Row="1" Grid.Column="1" Text="{Binding Path=ModelName}"></TextBox> <TextBlock Margin="7" Grid.Row="2">Unit Cost:</TextBlock> <TextBox Margin="5" Grid.Row="2" Grid.Column="1"

To create a new policy, switch to the Checkin Policy tab and select Add. This brings up the Add Check-in Policy dialog box shown in Figure 3-32.

One cool feature of using the preceding classes is that if you are using Visual Studio 2005, many of the properties can be manipulated using the Properties window, so you don t even have to look at the code. Don t worry. Not all of the class members can be handled this way. You will still need to write some code.

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Text="{Binding Path=UnitCost}"></TextBox> <TextBlock Margin="7,7,7,0" Grid.Row="3">Description:</TextBlock> <TextBox Margin="7" Grid.Row="4" Grid.Column="0" Grid.ColumnSpan="2" TextWrapping="Wrap" Text="{Binding Path=Description}"></TextBox> </Grid> Notice that the Grid wrapping all these details is given a name so that you can manipulate it in code and complete your data bindings. When you first run this application, no information will appear. Even though you ve defined your bindings, no source object is available. When the user clicks the button at runtime, you use the StoreDB class to get the appropriate product data. Although you could create each binding programmatically, this wouldn t make much sense (and it wouldn t save much code over just populating the controls by hand). However, the DataContext property provides a perfect shortcut. If you set it for the Grid that contains all your data binding expressions, all your binding expressions will use it to fill themselves with data. Here s the event handling code that reacts when the user clicks the button: Private Sub cmdGetProduct_Click(ByVal sender As Object, _ ByVal e As RoutedEventArgs) Dim ID As Integer If Int32.TryParse(txtID.Text, ID) Then Try gridProductDetails.DataContext = Application.StoreDB.GetProduct(ID) Catch MessageBox.Show("Error contacting database.") End Try Else MessageBox.Show("Invalid ID.") End If End Sub

Figure 3-32. Add Check-in Policy dialog box There are three basic policies which you can customize based on the needs of the project. You can also create custom policies.

You don t need to do anything extra to enable database updates with this example. As you learned earlier, the TextBox.Text property uses two-way binding by default. As a result, the Product object is modified as you edit the text in the text boxes. (Technically, each property is updated when you tab to a new field, because the default source update mode for the TextBox.Text property is LostFocus.) You can commit changes to the database at any time. All you need is to add an UpdateProduct() method to the StoreDB class and an Update button the window. When clicked, your code can grab the current Product object from the data context and use it to commit the update: Private Sub cmdUpdateProduct_Click(ByVal sender As Object, _ ByVal e As RoutedEventArgs) Dim product As Product = CType(gridProductDetails.DataContext,Product) Try

Okay, I ve shown you all the pieces, but how do you actually go about creating a Windows service The example in this section shows you. Here I ll also explore a new feature to make things interesting: system event logs. The example will use system event logs to log all Windows service handlers that are triggered. The easy route would be to just use file I/O like what I covered in 8, but since the normal route for logging events in a Windows service is the system event log, I thought I d do it that way (albeit stripped down and simplified). But before we get into this new feature, let s start things off by creating the basic skeleton program from which almost all Windows services emerge.

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