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The Using statement declares that you are using a disposable object for a short period of time As soon as you finish using that object and the Using block ends, the common language runtime will release it immediately by calling the Dispose() method Here s the basic structure of the Using block: Using object .. End Using It just so happens that calling the Dispose() method of a connection object is equivalent to calling Close() That means you can shorten your database code with the help of a Using block 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.

For example, if you made the mistake of calling it before you set the TransactionCount variable, the corresponding expression would just be converted to 0. Remember, data binding is a one-way street. This means changing the TransactionCount variable after you ve used the DataBind() method won t produce any visible effect. Unless you call the DataBind() method again, the displayed value won t be updated.

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Listing 18-9. The Server-Side Code (suggest.php) < php $arr = array( 'Alpha','Bravo','Charlie','Delta','Echo', 'Foxtrot','Golf','Hotel','India','Juliett', 'Kilo','Lima','Mike','November','Oscar', 'Papa','Quebec','Romeo','Sierra','Tango', 'Uniform','Victor','Whiskey','X-ray','Yankee', 'Zulu' ); $search = strtolower($_POST['search']); $hits = array(); if(!empty($search)) { foreach($arr as $name) { if(strpos(strtolower($name), $search) === 0) { $hits[] = $name; } } } echo json_encode($hits); If you type a character into the resulting input box, you should see that any matching entry will be shown. Using the same technique, you could show the results of an SQL query, such as a username search or an account number lookup.

Here s how you could rewrite the earlier example with a Using block: Dim myConnection As New SqlConnection(connectionString) Try Using myConnection ' Try to open the connection myConnectionOpen() lblInfoText = "<b>Server Version:</b> " & myConnectionServerVersion lblInfoText &= "<br /><b>Connection Is:</b> " & _ myConnectionStateToString() End Using Catch err As Exception ' Handle an error by displaying the information lblInfoText = "Error reading the database" lblInfoText &= errMessage End Try.

The previous example uses a data binding expression to set static text information inside a label tag. However, you can also use single-value data binding to set other types of information on your page, including control properties. To do this, you simply have to know where to put the data binding expression in the web page markup. For example, consider the following page, which defines a variable named URL and uses it to point to a picture in the application directory: public partial class DataBindingUrl : System.Web.UI.Page { protected string URL; protected void Page_Load(Object sender, EventArgs e) { URL = "Images/picture.jpg"; this.DataBind(); } } You can now use this URL to create a label, as shown here: <asp:Label id="lblDynamic" runat="server"><%# URL %></asp:Label> You can also use it for a check box caption: <asp:CheckBox id="chkDynamic" Text="<%# URL %>" runat="server" /> or you can use it for a target for a hyperlink: <asp:Hyperlink id="lnkDynamic" Text="Click here!" NavigateUrl="<%# URL %>" runat="server" /> You can even use it for a picture: <asp:Image id="imgDynamic" ImageUrl="<%# URL %>" runat="server" /> The only trick is that you need to edit these control tags manually. Figure 15-4 shows what a page that uses all these elements would look like.

lblInfo.Text &= "<br /><b>Now Connection Is:</b> " lblInfo.Text &= myConnection.State.ToString() There s one difference in the way this code is implemented as compared to the previous example. The error-handling code wraps the Using block. As a result, if an error occurs the database connection is closed first, and then the exception-handling code is triggered. In the first example, the error-handling code responded first, and then the Finally block closed the connection afterward. Obviously, this rewrite is a bit better, as it s always good to close database connections as soon as possible.

Figure 15-4. Multiple ways to bind the same data To examine this example in more detail, try the sample code for this chapter.

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