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The Server Explorer provides a tree that allows you to explore various types of services on the current computer (and other servers on the network). It s similar to the Computer Management administrative tool. Typically, you ll use the Server Explorer to learn about available event logs, message queues, performance counters, system services, and SQL Server databases on your computer. The Server Explorer is particularly noteworthy because it doesn t just provide a way for you to browse server resources; it also allows you to interact with them. For example, you can create databases, execute queries, and write stored procedures using the Server Explorer in much the same way that you would using the Enterprise Manager administrative utility that s included with SQL Server. To find out what you can do with a given item, right-click it. Figure 2-12 shows the Server Explorer window listing the databases in a local SQL Server and allowing you to retrieve all the records in the selected table.

' Close the <DVD> element. writer.WriteEndElement() ... This is quite straightforward, isn t it To complete the document, you simply need to close the <DvdList> item, with yet another call to WriteEndElement(). You can then close the XmlTextWriter, as shown here: ... writer.WriteEndElement() writer.Close() End Sub To try this code, call the WriteXML() procedure from the Page.Load event handler. It will generate an XML file named DvdList.xml in the current folder, as shown in Figure 12-1.

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In this case, instead of interacting with a file, these stored procedures call the custom HTTP handler and pass a query string that indicates what change has taken place or what cache key has been affected The HTTP handler can then use the CacheRemove() method to get rid of the data The problem with this approach is that it requires the considerable complexity of an extended stored procedure Also, the request to the HTTP handler must be synchronous, which causes a significant delay Even worse, this delay happens every time the stored procedure executes, because the stored procedure has no way of determining if the call is necessary or if the cached item has already been removed As a result, the overall time taken to execute the stored procedure increases significantly, and the overall scalability of the database suffers.

Keep in mind that when you use the XmlTextWriter to create an XML file, you face all the limitations that you face when writing any other type of file in a web application. In other words, you need to take safeguards (such as generating unique filenames) to ensure that two different clients don t run the same code and try to write the same file at once. 13 has more information about file access and dealing with these types of problems.

Many of Visual Studio s most welcome enhancements appear when you start to write the code that supports your user interface. To start coding, you need to switch to the code-behind view. To switch back and forth, you can use two buttons that are placed just above the Solution Explorer window. The tooltips identify these buttons as View Code and View Designer. When you switch to code view, you ll see the page class for your web page. You ll learn more about code-behind later in this chapter. ASP.NET is event-driven, and everything in your web-page code takes place in response to an event. To create a simple event handler for the Button.Click event, double-click the button in design view. Here s a simple example that displays the current date and time in a label: protected void Button1_Click(object sender, EventArgs e) { Label1.Text = "Current time: " + DateTime.Now.ToLongTimeString(); } To test this page, select Debug Start Debugging from the menu. Because this is the first time running any page in this application, Visual Studio will inform you that you need a configuration file that specifically enables debugging (see Figure 2-13).

Like the marker file approach, it works well in small scenarios but can t handle large-scale, complex applications Both of these approaches introduce a whole other set of complications in web farm scenarios with multiple servers What s needed is an approach that can deliver notifications asynchronously, and in a scalable and reliable fashion In other words, the database server should notify ASP NET without stalling the current connection Just as importantly, it should be possible to set up the cache dependency in a loosely coupled way so that stored procedures don t need to be aware of the caching that s in place The database server should watch for changes that are committed by any means, including from a script, an inline SQL command, or a batch process.

The following are ways to read and navigate the content of an XML file: Using XmlDocument: You can load the document using the XmlDocument class mentioned earlier. This holds all the XML data in memory once you call Load() to retrieve it from a file or stream. It also allows you to modify that data and save it back to the file later. The XmlDocument class implements the full XML DOM.

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