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Target = sn("target") End Sub Notice that you can t retrieve the custom attribute from a strongly typed property Instead, you retrieve it by name using the SiteMapNode indexer..

Figure 7-2. Testing a connection Connections are a limited server resource. This means it s imperative that you open the connection as late as possible and release it as quickly as possible. In the previous code sample, an exception handler is used to make sure that even if an unhandled error occurs, the connection will be closed in the finally block. If you don t use this design and an unhandled exception occurs, the connection will remain open until the garbage collector disposes of the SqlConnection object. An alternate approach is to wrap your data access code in a using block. The using statement declares that you are using a disposable object for a short period of time. As soon as the using block ends, the CLR releases the corresponding object immediately by calling its Dispose() method. Interestingly, calling the Dispose() method of a Connection object is equivalent to calling Close(). That means you can rewrite the earlier example in the following, more compact, form: string connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString; SqlConnection con = new SqlConnection(connectionString); using (con) { con.Open(); lblInfo.Text = "<b>Server Version:</b> " + con.ServerVersion; lblInfo.Text += "<br /><b>Connection Is:</b> " + con.State.ToString(); } lblInfo.Text += "<br /><b>Now Connection Is:</b> "; lblInfo.Text += con.State.ToString(); The best part is that you don t need to write a finally block the using statement releases the object you re using even if you exit the block as the result of an unhandled exception.

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Visual Studio 2005 uses automatic event wire-up, as indicated in the Page directive. Automatic event wire-up has two basic principles: All page event handlers are connected automatically based on the name of the event handler. In other words, the Page_Load() method is automatically called when the page loads. Visual Studio adds a comment to your page class to point out the commonly used event methods. All control event handlers are connected using attributes in the control tag. The attribute has the same name as the event, prefixed by the word On. For example, if you want to handle the Click event of the Button control, you simply need to set the OnClick attribute in the control tag with the name of the event handler you want to use. Here s the change you need: <asp:Button id="cmdOK" OnClick="txtName_Click" runat="server"> ASP.NET controls always use this syntax. Remember, because ASP .NET must connect the event handlers, the derived page class must be able to access the code-behind class. This means your event handlers must be declared with the protected or public keyword. (Protected is preferred, because it prevents other classes from seeing this method.) Of course, if you re familiar with .NET events, you know there s another approach to connect an event handler. You can do it dynamically through code using delegates. Here s an example: cmdOK.Click += new EventHandler(txtName_Click); This approach is useful if you re creating controls on the fly. You ll see this technique in action in 3.

You can also create a custom SiteMapProvider that returns instances of a custom SiteMapNode-derived class. However, a significant amount of extra code is required, and as a result it s often not worth the trouble.

Acquiring a connection takes a short, but definite, amount of time. In a web application in which requests are being handled efficiently, connections will be opened and closed endlessly as new requests are processed. In this environment, the small overhead required to establish a connection can become significant and limit the scalability of the system. One solution is connection pooling. Connection pooling is the practice of keeping a permanent set of open database connections to be shared by sessions that use the same data source. This avoids the need to create and destroy connections all the time. Connection pools in ADO.NET are completely transparent to the programmer, and your data access code doesn t need to be altered. When a client requests a connection by calling Open(), it s served directly from the available pool, rather than re-created. When a client releases a connection by calling Close() or Dispose(), it s not discarded but returned to the pool to serve the next request.

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