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tasks, they just might use this technique to optimize performance. For example, you could get the product catalog from a database once, and keep that data in memory on the web server so you can reuse it when someone else requests the same page. This technique is called caching, and you ll learn to use it in 24.

To query information with simple data access, follow these steps: 1. Create Connection, Command, and DataReader objects. 2. Use the DataReader to retrieve information from the database, and display it in a control on a web form. 3. Close your connection. 4. Send the page to the user. At this point, the information your user sees and the information in the database no longer have any connection, and all the ADO.NET objects have been destroyed. To add or update information, follow these steps: 1. Create new Connection and Command objects. 2. Execute the Command (with the appropriate SQL statement). This chapter demonstrates both of these approaches. Figure 15-9 shows a high-level look at how the ADO.NET objects interact to make direct data access work.

The HTML Helper s $tags Array 47 var $tags = array( 48 96 97 'error' => '<div%s>%s</div>' 98 ); I ve deliberately skipped over lines 48 96 in Listing 9-7 because the same idea is repeated throughout the array The HTML helper uses this array to construct the HTML tags that are returned with its functions Changing one of these keys and values will change the output for the whole HTML helper In other words, whenever the HTML helper, in any function, displays the error tag, you can replace its value on line 97 with your own, and all error tags will reflect the change The most direct way to alter the $tags array would be to create your own in the App helper However, you would have to specify all tags used by the HTML helper, which would result in duplication between the App helper and the HTML helper.

Figure 15-9. Direct data access with ADO.NET Before continuing, make sure you import the ADO.NET namespaces. In this chapter, we assume you re using the SQL Server provider, in which case you need these two namespace imports: Imports System.Data Imports System.Data.SqlClient

For your first set of math problems, look at the Math Problem 1 section near the top of the worksheet, as shown in Figure 1-6.

Before you can retrieve or update data, you need to make a connection to the data source. Generally, connections are limited to some fixed number, and if you exceed that number (either because you run out of licenses or because your database server can t accommodate the user load), attempts to create new connections will fail. For that reason, you should try to hold a connection open for as short a time as possible. You should also write your database code inside a Try/Catch error-handling structure so you can respond if an error does occur, and make sure you close the connection even if you can t perform all your work. When creating a Connection object, you need to specify a value for its ConnectionString property. This ConnectionString defines all the information the computer needs to find the data source, log in, and choose an initial database. Out of all the details in the examples in this chapter, the ConnectionString is the one value you might have to tweak before it works for the database you want to use. Luckily, it s quite straightforward. Here s an example that uses a connection string to connect to SQL Server through the OLE DB provider: Dim myConnection As New OleDbConnection() myConnection.ConnectionString = "Provider=SQLOLEDB.1;Data Source=localhost;" & _ "Initial Catalog=Pubs;Integrated Security=SSPI"

For optimum performance, you should use the SqlConnection object from the SQL Server provider instead. The connection string for the SqlConnection object is quite similar and just omits the Provider setting: Dim myConnection As New SqlConnection() myConnection.ConnectionString = "Data Source=localhost;" & _ "Initial Catalog=Pubs;Integrated Security=SSPI" If you re using SQL Server 2005 Express Edition, your connection string will include an instance name, as shown here: Dim myConnection As New SqlConnection() myConnection.ConnectionString = "Data Source=localhost\SQLEXPRESS;" & _ "Initial Catalog=Pubs;Integrated Security=SSPI"