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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: x 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.

This is obviously not very secure overall when you introduce the problem of phishing, it becomes exponentially problematic Phishers can fake a site that matches a common denominator location for example, one of a country s largest banks or online payment systems and depending on the complexity of the attack, steal one or more of these username and password pairs If you use only four username and password pairs, each pair that is stolen gives them the keys to 25 percent of the sites you use When you see the statistics that phishing is currently growing at a rate of 1,000 percent per year, you probably recognize that this is a problem that needs to be solved expediently.

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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. Figure 19-1 shows two tables in the Store database and their schemas.

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 string connectionString = Properties.Settings.Default.StoreDatabase; public Product GetProduct(int ID) { ... } } 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 Properties node in the Solution Explorer, and then click the Settings tab.) When other windows need data, they call the StoreDB.GetProduct() method to retrieve a Product object. The Product object is a custom object that has a sole purpose in life to represent the information for a single row in the Products table. You ll consider it in the next section. You have several options for making the StoreDB class available to the windows in your application: x x x The window could create an instance of StoreDB whenever it needs to access the database. You could change the methods in the StoreDB class to be static. You could create a single instance of StoreDB and make it available through a static property in another class (following the factory pattern).

The first two options are reasonable, but both of them limit your flexibility. The first choice prevents you from caching data objects for use in multiple windows. Even if you don t want to use that caching right away, it s worth designing your application in such a way that it s easy to implement later. Similarly, the second approach assumes you won t have any instance-specific state that you need to retain in the StoreDB class. Although this is a good design principle, you might want to retain some details (such as the connection string) in memory. If you convert the StoreDB class to use static

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