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In many cases, it s best not only to detect and catch exceptions but to log them as well. For example, some problems may occur only when your web server is dealing with a particularly large load. Other problems might recur intermittently, with no obvious causes. To diagnose these errors and build a larger picture of site problems, you need to log exceptions so they can be reviewed later. The .NET Framework provides a wide range of logging tools. When certain errors occur, you can send an e-mail, add a database record, or create and write to a file. We describe many of these techniques in other parts of this book. However, you should keep your logging code as simple as possible. For example, you ll probably run into trouble if you try to log a database exception using another table in the database. One of the most fail-safe logging tools is the Windows event logging system, which is built into the Windows operating system and available to any application. Using the Windows event logs, your website can write text messages that record errors or unusual events. The Windows event logs store your messages as well as various other details, such as the message type (information, error, and so on) and the time the message was left.

Information is limited to simple strings, which must contain URL-legal characters. Information is clearly visible to the user and to anyone else who cares to eavesdrop on the Internet. The enterprising user might decide to modify the query string and supply new values, which your program won t expect and can t protect against. Many browsers impose a limit on the length of a URL (usually from 1KB to 2KB). For that reason, you can t place a large amount of information in the query string and still be assured of compatibility with most browsers.

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To view the Windows event logs, you use the Event Viewer tool that s included with Windows To launch it, begin by selecting Start Settings Control Panel (or just Start Control Panel in Windows Vista) Open the Administrative Tools group, and then choose Event Viewer If you re running Windows XP or Windows Server 2003, you ll see just three logs Application, Security, and System If you re running Windows Vista or Windows Server 2008, you ll find these three plus a Setup log, all of which appear under the Windows Logs section (Figure 8-6) Table 8-2 describes these standard Windows logs Using the Event Viewer, you can perform a variety of management tasks with the logs.

Adding information to the query string is still a useful technique. It s particularly well suited in database applications where you present the user with a list of items that correspond to records in a database, such as products. The user can then select an item and be forwarded to another page with detailed information about the selected item. One easy way to implement this design is to have the first page send the item ID to the second page. The second page then looks that item up in the database and displays the detailed information. You ll notice this technique in e-commerce sites such as Amazon. To store information in the query string, you need to place it there yourself. Unfortunately, you have no collection-based way to do this. Instead, you ll need to insert it into the URL yourself. Here s an example that uses this approach with the Response.Redirect() method: // Go to newpage.aspx. Submit a single query string argument // named recordID, and set to 10. Response.Redirect("newpage.aspx recordID=10"); You can send multiple parameters as long as they re separated with an ampersand (&): // Go to newpage.aspx. Submit two query string arguments: // recordID (10) and mode (full). Response.Redirect("newpage.aspx recordID=10&mode=full"); The receiving page has an easier time working with the query string. It can receive the values from the QueryString dictionary collection exposed by the built-in Request object: string ID = Request.QueryString["recordID"]; Note that information is always retrieved as a string, which can then be converted to another simple data type. Values in the QueryString collection are indexed by the variable name. If you attempt to retrieve a value that isn t present in the query string, you ll get a null reference.

all modern browsers. The script in Listing 18-5 will try the modern route first and will fall back to the ActiveX method if the native XHR object is not available. Tables 18-1 and 18-2 describe the properties and methods available to the XHR object.

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