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No matter how you plan to use data binding (or even if you don t), your data access code should always be coded in a separate class. This approach is the only way you have the slightest chance to make sure you can efficiently maintain, optimize, troubleshoot, and (optionally) reuse your data access code. When creating a data class, you should follow a few basic guidelines in this section: Open and close connections quickly. Open the database connection in every method call, and close it before the method ends. This way, a connection can t be inadvertently left open. One way to ensure the connection is closed at the appropriate time is with a using block. Implement error handling. Use error handling to make sure that connections are closed even if an exception occurs. Follow stateless design practices. Accept all the information needed for a method in its parameters, and return all the retrieved data through the return value. This avoids complications in a number of scenarios (for example, if you need to create a multithreaded application or host your database component on a server). Store the connection string in one place. Ideally, this is the configuration file for your application.

Adapter FileSystemDriver InteractiveProcess KernelDriver RecognizerDriver Win32OwnProcess Win32ShareProcess

The database component that s shown in the following example retrieves a table of product information from the Store database, which is a sample database for the fictional IBuySpy store included with some Microsoft case studies. You can get a script to install this database with the online samples for this chapter. Figure 16-6 shows two tables in the Store database and their schemas.

To select the actual changes to merge, just click the correct row from either or both files (in the upper windows). Figure 3-29 shows the result of selecting each line from each file.

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A service for a piece of hardware that needs its own driver. A file system driver. This is a specific type of kernel driver. A service that can communicate with the desktop. A low-level hardware device driver. A file system driver used during the system startup to determine file system types. A service made up of only a single service in a process. A service made up of multiple services in a single shared process.

Figure 16-6 A portion of the Store database The data access class is exceedingly simple it provides just a single method that allows the caller to retrieve one product record Here s the basic outline: Public Class StoreDB ' Get the connection string from the current configuration file Private connectionString As String = MySettingsDefaultStoreDatabase Public Function GetProduct(ByVal ID As Integer) As Product .. End Function End Class The query is performed through a stored procedure in the database named GetProduct The connection string isn t hard-coded instead, it s retrieved through an application setting in the config file for this application (To view or set application settings, double-click the My Project node in the Solution Explorer, and then click the Settings tab) When other windows need data, they call the StoreDBGetProduct() method to retrieve a Product object.

The lines of code are added bottom to top. So if the conflict on line 11 from the server file is selected (as shown in Figure 3-29) and then the conflict on line 11 from the local file is selected, the resulting merge file would be as shown, at the bottom of the merge dialog box. Obviously, this is not the desired solution. You can unselect a change from one of the files and click OK. After OK is selected the files are merged and saved in the repository.

Unlike other application types, Windows services actually require three different programs to function properly. The first program is the service application itself. This program implements the functionality required by the Windows service. The second program is the service control application. This program provides the ability to start, pause, restart, stop, and send unique commands to the service application. The final program is the service configuration application. This program installs and configures the service application.

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