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The main challenge is to understand how the code that accesses the database works. The .NET technology that permits accessing a database from C# code is called ADO.NET. ADO.NET groups all .NET classes that are related to database access. ADO.NET is a complex subject that requires a separate book by itself, so we ll cover just enough to help you understand how your business tier works. For more information about ADO.NET, refer to Beginning C# 2008 Databases: From Novice to Professional (Apress, 2008). The data access class named GenericDataAccess that you ll write will make extensive use of many ADO.NET features. The GenericDataAccess class deals with accessing the database, executing stored procedures, and returning the retrieved data. This class will provide generic data access functionality for the business tier classes, which need to read or manipulate that data. Each database operation always consists of three steps: 1. Open a connection to the SQL Server database. 2. Perform the needed operations with the database and get back the results. 3. Close the connection to the database. Before you implement the GenericDataAccess class itself, which implements all these steps, we ll have a quick look at each step individually.

To run the test class TestCurrencyTrader, the following code is used. TestCurrencyTrader cls = new TestCurrencyTrader(); cls.IntializeExchangeRate(); The modified test code entails instantiating TestCurrencyTrader and then calling the method InitializeExchangeRate(). But is this a test After all, the InitializeExchangeRate() method doesn t have a parameter or return value. Think of it as sending a letter via mail. You don t know if the letter will arrive, but it probably will. Tests that are probably passed are a really bad idea. We need to move the verification code from the test routine to the TestCurrencyTrader class, like this: class TestCurrencyTrader : CurrencyTrader { public void InitializeExchangeRate() { ExchangeRate = 100.0; if (ExchangeRate != 100.0) { throw new Exception("100.0 verification failed"); } } } The bolded code illustrates the verification code used to ensure that the value assigned to ExchangeRate is the same one that is retrieved.

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Tip Always try to make the second step (executing the commands) as fast as possible. Keeping a data

The following sections describe the SOLVSAMP .XLS file s seven worksheets and provide exercises for you to experiment with these Solver samples. After you complete each example, in the Solver Results dialog box, click Restore Original Values, and then click OK to discard the results and return the cells to their former values. This way, the sample worksheets will not be changed by your experiments.

Note The tests we re using are becoming more complicated, and you may wonder, Why do it that way

connection open for too long or having too many database connections open at the same time is expensive for your application s performance. The golden rule is to open the connection as late as possible, perform the necessary operations, and then close it immediately.

The class used to connect to SQL Server is SqlConnection When creating a new database connection, you always need to specify at least three important pieces of data: The name of the SQL Server instance you re connecting to The authentication information that will permit you to access the server The database you want to work with This connection data is grouped in a connection string, which needs to be passed to the SqlConnection object The following code snippet demonstrates how to create and open a database connection (You don t need to type anything just yet here we re just explaining the theory, and we ll put it into practice in a step-by-step exercise just a little bit later) // Create the connection object SqlConnection connection = new SqlConnection(); // Set the connection string connection.

For this book, we are writing tests and creating our own testing framework. Normally you would not do that. You would use a testing framework such as NUnit (http://www.nunit.org) or the Microsoft Visual Studio Professional tools to help create the tests. But here I want to demonstrate how to use C#, not a testing tool. By learning how to write the tests from the ground up, you will understand what to expect from testing frameworks.

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