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memory. If you convert the StoreDB class to use static methods, it becomes much more difficult to access different instances of the Store database in different back-end data stores. Ultimately, the third option is the most flexible. It preserves the switchboard design by forcing all the windows to work through a single property. Here s an example that makes an instance of StoreDB available through the Application class: Public Class Application Private Shared _storeDB As New StoreDB() Public Shared ReadOnly Property StoreDB() As StoreDB Get Return _storeDB End Get End Property End Class In this book, we re primarily interested with how data objects can be bound to WPF elements. The actual process that deals with creating and filling these data objects (as well as other implementation details, such as whether StoreDB caches the data over several method calls, whether it uses stored procedures instead of inline queries, whether it fetches the data from a local XML file when offline, and so on) isn t our focus. However, just to get an understanding of what s taking place, here s the complete code: Public Class StoreDB Private connectionString As String = My.Settings.Default.StoreDatabase Public Function GetProduct(ByVal ID As Integer) As Product Dim con As New SqlConnection(connectionString) Dim cmd As New SqlCommand("GetProductByID", con) cmd.CommandType = CommandType.StoredProcedure cmd.Parameters.AddWithValue("@ProductID", ID) Try con.Open() Dim reader As SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.SingleRow) If reader.Read() Then ' Create a Product object that wraps the ' current record. Dim product As New Product( _ CStr(reader("ModelNumber")), CStr(reader("ModelName")), _ CDec(reader("UnitCost")), CStr(reader("Description")), _ CStr(reader("ProductImage"))) Return product Else Return Nothing End If

You don t have to write your own service control application, since the Windows operating system provides one for you, as you saw previously with the Administrative Tools Services application. This tool provides limited functionality. It can only start, stop, pause, resume, and restart a Windows service. When you write your own service control application, you can query and retrieve the properties of the Windows service. Plus, another cool feature of writing your own implementation of the service control application is you can write custom controls that allow you to perform more specialized tasks within the Windows service. Whenever you use the Services application or your own service control application, you are still using the SCM to communicate with your Windows service. Your service application and service control application only have built-in functionality to communicate via the SCM. You can also use TCP/IP to directly communicate with the service application when the functionality provided by the SCM just doesn t cut it. Again, since I don t cover network programming until 17, I will not show how to write this code, but after you finish 17, you should have no trouble writing it yourself.

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s Note Currently, the GetProduct() method doesn t include any exception handling code, so all exceptions

Figure 3-30. File Types dialog box This dialog box allows you to specify a couple of options related to how specific types are supported on a global basis. You can edit any of the values or add new file types. The purpose of this dialog box is to configure file merging and check-out options. If File Merging is enabled, then the file type is supported by multiple check-outs as well. The other information is just classification information and has no effect on the file.

The service configuration application does as its name suggests: it configures the Windows service. Through this application, you specify things like whether the Windows service is started automatically at startup, manually, or is disabled; the user to run the session under; and any dependencies that the services may have. Windows services normally start when the computer is booted, but you have the option to determine manually when the service will be started. You use the service configuration application to set up the registry and then the service control application to perform the actual startup process. The Windows operating system provides you with a very limited service configuration application, as the Administrative Tools Services application handles the setting up of automatic startup, manual startup, and disabling of the Windows service. The Windows service can be run under four different security context groups as shown in Table 14-2.

will bubble up the calling code. This is a reasonable design choice, but you might want to catch the exception in GetProduct(), perform cleanup or logging as required, and then rethrow the exception to notify the calling code of the problem. This design pattern is called caller inform.

To configure a team project, right-click the project in Team Explorer and select Team Project Settings Source Control. There are three different categories of options you can set: Checkout Settings, Checkin Policy, and Checkin Notes (Figure 3-31).

The data object is the information package that you plan to display in your user interface. Any class works, provided it consists of public properties (fields and private properties aren t supported). In addition, if you want to use this object to make changes (via two-way binding), the properties cannot be read-only. Here s the Product object that s used by StoreDB: Public Class Product Private _modelNumber As String Public Property ModelNumber() As String Get Return _modelNumber End Get Set(ByVal value As String) _modelNumber = value End Set End Property Private _modelName As String Public Property ModelName() As String Get Return _modelName End Get Set(ByVal value As String) _modelName = value End Set End Property Private _unitCost As Decimal Public Property UnitCost() As Decimal Get

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