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Returns or sets the keyboard shortcut that allows the user to quickly navigate to the control. For example, if set to A, the user can move the focus to this control by pressing Alt+A. Returns or sets the background color. Returns or sets the border color. One of the values from the BorderStyle enumeration, including Dashed, Dotted, Double, Groove, Ridge, Inset, Outset, Solid, and None. Returns or sets the border width. Returns or sets the CSS style to associate with the control. The CSS style can be defined in a <style> section at the top of the page or in a separate CSS file referenced by the page. Returns or sets the control s enabled state. If false, the control is usually rendered grayed-out and is not usable. Returns an object with all the style information of the font used for the control s text. This property includes subproperties that can be set with the object-walker syntax shown later in this chapter. Returns or sets the foreground color; for example, that of the text of the control. Returns or sets the control s height. A number that allows you to control the tab order. The control with a TabIndex of 0 has the focus when the page first loads. Pressing Tab moves the user to the control with the next lowest TabIndex, provided it is enabled. This property is supported only in Internet Explorer 4.0 and higher. Displays a text message when the user hovers the mouse above the control. Many older browsers don t support this property. Returns or sets the control s width.

The following example demonstrates the ServerClick and ServerChange events and shows you the order in which they unfold. To create this example, you need a text box, list box, and check box. Here are the controls on the page: <form id="Form1" runat="server"> <div> <select runat="server" id="List1" size="5" multiple Name="List1"> <option>Option 1</option> <option>Option 2</option> </select> <br /> <input type="text" runat="server" ID="Textbox1" Size="10" Name="Textbox1"><br /> <input type="checkbox" runat="server" ID="Checkbox1" Name="Checkbox1">Option text<br /> <input type="submit" runat="server" ID="Submit1" Name="cmdSubmit" value="Submit Query"> </div> </form> Note that this code declares two list items for the list box and includes the multiple attribute. This means that the user will be able to select multiple items by holding down the Ctrl key while clicking each entry. The text box and the check box are attached to the same event handler, while the list box uses a separate event handler with different code. The easiest way to set this up in Visual Studio is to create a text box event handler by double-clicking the text box. Then, rename the event handler to Ctrl_ServerChange(), and enter the code shown here: protected void Ctrl_ServerChange(object sender, System.EventArgs e) { Response.Write("<li>ServerChange detected for " + ((Control)sender).ID + "</li>"); } The actual event handler code is quite straightforward. It simply casts the sender object to a Control type, reads its ID property, and writes a message declaring that the event was detected. Now, switch to the HTML source view, and edit the text box and check box tags to bind their ServerChange events to the new event handler, as shown here: <input type="text" runat="server" ID="Textbox1" Size="10" Name="Textbox1" OnServerChange="Ctrl_ServerChange"><br /> <input type="checkbox" runat="server" ID="Checkbox1" Name="Checkbox1" OnServerChange="Ctrl_ServerChange">

Using the Ajax approach, you can create impressive, highly responsive web pages. However, writing the client-side script is time-consuming. Visual Studio can t provide the same rich design experience you get when writing server-side code, and it doesn t provide debugging tools to help you track down the inevitable errors that crop up in the loosely typed JavaScript language. And even when you ve successfully completed your task, you ll need to test on a wide range of other browsers, unless you re intimately familiar with the minor variations in JavaScript support on different browsers. For these reasons, many developers don t write their client-side script by hand, even when designing an Ajax-style page. Instead, they prefer to deal with a higher-level component that can generate the script code they need. One example is the free third-party Ajax.NET library, which is available at http://ajax.schwarz-interactive.de/csharpsample. Ajax.NET uses attributes to flag methods, which then become remotely callable through a client callback and a custom HTTP handler. Another example is Atlas, the more comprehensive Microsoft framework for Ajax applications that s still in development (and discussed in the next chapter). Although both Atlas and Ajax.NET are good choices, you can perform the most essential Ajax task sending an asynchronous request to the server using the new client callback feature that appears in ASP.NET. Client callbacks give you a way to refresh a portion of data in a web page without triggering a full postback. Best of all, you don t need the script code that uses the XmlHTTPRequest object. However, you do still need to write the client-side script that processes the server response.

ASP .NET includes a web control that duplicates each HTML server control and provides the same functionality. These web controls inherit from WebControl and add their own properties and events. Table 4-9 summarizes these core controls and their specific members.