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As any programmer will tell you, you re never going to write code that doesn t fall over at some point whether it s caused by an error within the code or something outside the scope of the code (such as someone unplugging the database server). Unless you have some way of handling any errors that occur, any problems you encounter can have the side effect of leaving connections to the database open. As you ve already learned, database connections are a finite resource, so leaving connections open is definitely not a good idea. If you re using SqlDataSource objects to connect to the database, as in 3, you don t need to worry about error handling to close the database connections. The SqlDataSource handles all the connections to the database internally, so you can be sure that any open database connections are handled before any error is thrown. However, when you re interacting with the database in code, you do need to catch and handle errors.

Web services provide some of the same opportunities for code reuse as custom components. However, web services are primarily designed as an easy way to share functionality across different computers and platforms. A component, on the other hand, isn t nearly as easy to share with the wide world of the Internet, but it is far more efficient for sharing internally (for example, between different applications in the same company or different websites on the same server). For that reason, web services and components don t directly compete in fact, a web service could even use a component (or vice versa). In some cases, you might find yourself programming a site with a mixture of the two, putting the code that needs to be reused in-house into components and putting the functionality that needs to be made publicly available into web services.

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To create a component, you create a new class library project in Visual Studio. Just select File New Project, and choose the Class Library project template in the Add New Project dialog box (see Figure 24-2). You ll need to choose a file location and a project name.

You should already be familiar with the try..catch..finally syntax for handling errors, so you ll now see how to use this syntax to handle any errors that may occur within a page. If an error occurs, you ll write the error to a log file and close the open database connection. 1. Open Select.aspx from the root of the 04 Web site and switch to the Source view of the page. 2. Add the following Import statement to the top of the page after the existing Import statements: <%@ Import Namespace="System.IO" %> 3. Change the Page_Load event as follows (the changed lines of code are shown in bold, and note that the name of the table is deliberately incorrect, with an s at the end): protected void Page_Load(object sender, EventArgs e) { if (Page.IsPostBack == false) { // create the connection SqlConnection myConnection = new SqlConnection(); try { // configure the connection string strConnectionString = ConfigurationManager. ConnectionStrings["SqlConnectionString"].ConnectionString; myConnection.ConnectionString = strConnectionString;

Microsoft that allows you to build powerful community web sites quickly and easily. By default, the CSK comes with out-of-the box functionality that supports nine types of content, including articles, books, events, photo galleries, downloads, user polls, and more. It also supports features such as moderation, upload quotas, comments, ratings, newsletters, advertisements, web services, and security. However, by the time of this writing, the CSK hasn t been updated for ASP.NET 2.0. (You can download the CSK at http://www.asp.net.)

To get a better understanding of the difference, consider the following code, which shows a method that uses a parameter named number. This code uses the ByVal keyword to indicate that number should be passed by value: Private Sub ProcessNumber(ByVal number As Integer) number *= 2 End Sub Here s how you can call ProcessNumber(): Dim num As Integer = 10 ProcessNumber(num)

Here s what happens. When this code calls ProcessNumber() it passes a copy of the num variable. This copy is multiplied by two. However, the variable in the calling code isn t affected at all. This behavior changes when you use the ByRef keyword, as shown here: Private Sub ProcessNumber(ByRef number As Integer) number *= 2 End Sub Now when the method modifies this parameter (multiplying it by 2), the calling code is also affected: Dim num As Integer = 10 ProcessNumber(num)

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