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Data binding works a little differently depending on whether you re using single-value or repeated-value binding. To use single-value binding, you must insert a data binding expression into the markup in the .aspx file (not the code-behind file). To use repeated-value binding, you must set one or more properties of a data control. Typically, you ll perform this initialization when the Page.Load event fires. You ll see examples of both these techniques later in this chapter. Once you specify data binding, you need to activate it. You accomplish this task by calling the DataBind() method. The DataBind() method is a basic piece of functionality supplied in the Control class. It automatically binds a control and any child controls that it contains. With repeated-value binding, you can use the DataBind() method of the specific list control you re using. Alternatively, you can bind the whole page at once by calling the DataBind() method of the current Page object. Once you call this method, all the data binding expressions in the page are evaluated and replaced with the specified value. Typically, you call the DataBind() method in the Page.Load event handler. If you forget to use it, ASP.NET will ignore your data binding expressions, and the client will receive a page that contains empty values. This is a general description of the whole process. To really understand what s happening, you need to work with some specific examples.

Single-value data binding is really just a different approach to dynamic text. To use it, you add special data binding expressions into your .aspx files. These expressions have the following format: <%# expression_goes_here %>

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Interestingly, SQL Server Express has a feature that lets you bypass the master list and connect directly to any database file, even if it s not in the master list of databases. This feature is called user instances. Oddly enough, this feature isn t available in the full edition of SQL Server 2005. To use this feature, you need to set the User Instances value to True (in the connection string) and supply the file name of the database you want to connect to with the AttachDBFilename value. You don t supply an Initial Catalog value. Here s an example connection string that uses this approach: myConnection.ConnectionString = "Data Source=localhost\SQLEXPRESS;" & _ "AttachDBFilename=|DataDirectory|\Northwind.mdf;Integrated Security=True" There s another trick here. The file name starts with |DataDirectory|. This automatically points to the App_Data folder inside your web application directory. This way, you don t need to supply a full file path, which might not remain valid when you move the web application to a web server. Instead, ADO.NET will always look in the App_Data directory for a file named Northwind.mdf. User instances is a handy feature if you have a web server that hosts many different web applications that use databases and these databases are frequently being added and removed. However, because the database isn t in the master list, you won t see it in any administrative tools (although most administrative tools will still let you connect to it manually, by pointing out the right file location). But remember, this quirky but interesting feature is available in SQL Server Express only you won t find it in the full version of SQL Server 2005.

JavaScript to listen on an input box for a keyup event to be fired. When the event is fired, the JavaScript communicates the data currently in the search box to the PHP script on the server. You will use asynchronous mode and the XmlHttpRequest.onreadystatechange event to wait for the server s response. If another key is typed while a request is pending, XmlHttpRequest. abort() will be called and a new request created. Listings 18-8 and 18-9 show how to create this POST-based Ajax application, which consists of the suggest.htm and suggest.php files. Listing 18-8. The POST Client Side (suggest.htm) <html> <head> <script src="json.js" type="text/javascript"></script> <script type="text/javascript"> //Create a global variable for the XHR object var xhr; function getXHR() { var req; if (window.XMLHttpRequest) { req = new XMLHttpRequest(); } else if (window.ActiveXObject) { req = new ActiveXObject("Microsoft.XMLHTTP"); } return req; } function suggest() { //If there already is an outstanding //XHR request going on, abort it. if(xhr && xhr.readyState != 0) { xhr.abort(); } xhr = getXHR(); //Set up an asynchronous POST (CHANGE ME) xhr.open("POST","http://example.com/suggest.php",true); //Read the search value searchValue = document.getElementById("search").value; //URL encode the data data = "search="+encodeURIComponent(searchValue);

This may look like a script block, but it isn t. If you try to write any code inside this tag, you will receive an error. The only thing you can add is a valid data binding expression. For example, if you have a public or protected variable named Country in your page, you could write the following: <%# Country %> When you call the DataBind() method for the page, this text will be replaced with the value for Country (for example, Spain). Similarly, you could use a property or a built-in ASP.NET object as follows: <%# Request.Browser.Browser %> This would substitute a string with the current browser name (for example, IE). In fact, you can even call a function defined on your page, or execute a simple expression, provided it returns a result that can be converted to text and displayed on the page. Thus, the following data binding expressions are all valid: <%# GetUserName(ID) %> <%# 1 + (2 * 20) %> <%# "John " + "Smith" %> Remember, you place these data binding expressions in the markup portion of your .aspx file, not your code-behind file.

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