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t the beginning of this book, you learned that ASP.NET is just one component in Microsoft s ambitious .NET platform. As you know, .NET also includes new languages, a new philosophy for cross-language integration, an easier way to deploy code, and a toolkit of classes that allows you to do everything from handling errors to analyzing XML documents. In this chapter, you ll explore another one of the many features in the .NET Framework: the ADO.NET data access model. Quite simply, ADO.NET is the technology that .NET applications use to interact with a database. In this chapter, you ll learn about ADO.NET and the family of objects that provides its functionality. You ll also learn how to put these objects to work by creating simple pages that retrieve and update database records. However, you won t learn about the easiest way to use ADO.NET with the help of ASP.NET data binding. Although data binding is a powerful and practical feature, every ASP.NET developer should start with a solid grasp of ADO.NET fundamentals. That s because you ll need to write your own ADO.NET code to optimize performance-sensitive database routines, to perform data tasks that aren t covered by the data binding model, and to craft database components (as described in 23). Once you ve mastered the basics of ADO.NET in this chapter, you ll be ready to explore the time-saving shortcuts of the data binding model in 16 and 17.

sequence. This can cause issues when you use connection strings in code. There are two ways to deal with this problem. First, you can use two backslashes instead of one, as in localhost\\SQLEXPRESS. Or, you can put the @ character before the entire string, as in @"localhost\SQLEXPRESS". However, if you define the connection string in a configuration file, as described in the next section, you don t need to take either of these steps. That s because you re no longer dealing with pure C# code, so a single backslash is fine.

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Almost every piece of software ever written works with data. In fact, a typical web application is often just a thin user interface shell on top of sophisticated data-driven code that reads and writes information from a database. Often, website users aren t aware (or don t care) that the displayed information originates from a database. They just want to be able to search your product catalog, place an order, or check their payment records.

The connection string is actually a series of distinct pieces of information separated by semicolons (;). Each separate piece of information is known as a connection string property. The following list describes some of the most commonly used connection string properties, including the three properties used in the preceding example: Data source: This indicates the name of the server where the data source is located. If the server is on the same computer that hosts the ASP.NET site, localhost is sufficient. The only exception is if you re using a named instance of SQL Server. For example, if you ve installed SQL Server Express,

The most common way to manage data is to use a database. Database technology is particularly useful for business software, which typically requires sets of related information. For example, a typical database for a sales program consists of a list of customers, a list of products, and a list of sales that draws on information from the other two tables. This type of information is best described using a relational model, which is the philosophy that underlies all modern database products, including SQL Server, Oracle, and even Microsoft Access. As you probably know, a relational model breaks information down to its smallest and most concise units. For example, a sales record doesn t store all the information about the

You will find a complete list of SSL_CLIENT_* variables in your $_SERVER variable. You can use the information from these variables to identify clients by name, and since you certified the certificate, you can be sure that the user has access to that certificate and does not just know a username and password. That said, certificate authentication guarantees only that the user has access to the .p12 file; it does not confirm identity. Therefore, you will want to use multiple authentication controls, such as adding a username and password login, for sensitive operations.

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