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The event processing that occurs in the client browser is separate from the ASP.NET activity that occurs on the server to generate HTML output and respond to server-side events. In this section, we build an example server control that provides seamless integration of the two event models in a similar manner to the built-in ASP.NET Validator controls client-side and serverside functionality. We discuss Validator controls in 10. The control we build in this chapter is similar in functionality to the NumericUpDown Windows Forms control. Control developers who extend or create a server control that uses client-side features need to ensure that the client activities are smoothly integrated with the feature set of ASP.NET and do not contradict or interfere with mechanisms such as ViewState or postback. It is also recommended that developers build controls that integrate client-side scripts to degrade gracefully when the client viewing the generated HTML content does not support advanced features. A good example of this is the Validator class of controls, which emit client-side JavaScript validation routines only if the browser supports JavaScript. Let s now dive into creating the UpDown custom server control.

Next, you would create a second master page that uses the first master page (through the MasterPageFile attribute). This second master page would get the header from the first master page and could add the navigation controls in a panel on the left. Here s an example: <%@ Master Language="C#" AutoEventWireup="true" CodeFile="NestedMasterSecondLevel.master.cs" Inherits="NestedMasterSecondLevel_master" MasterPageFile="~/NestedMasterRoot.master"%> <asp:Content ID="Content1" ContentPlaceHolderID="RootContent" Runat="Server"> <table width="100%" bgcolor="#ccff00"> <tr> <td colspan="2"> <h2>The Second Level</h2> </td> <tr> <td width="200px"></td> <td bgcolor="white"> <asp:ContentPlaceHolder id="NestedContent" runat="server"> </asp:ContentPlaceHolder > </td> </tr> </table> </asp:Content> Presumably, your goal would be to create more than one version of the second master page, one for each section of your website. These would acquire the same standard header. Finally, each content page could use one of the second-level master pages to standardize its layout: <%@ Page Language="C#" MasterPageFile="~/NestedMasterSecondLevel.master" AutoEventWireup="true" CodeFile="NestedContentPage.aspx.cs" Inherits="NestedContentPage_aspx" Title="Untitled Page" %> <asp:Content ID="Content1" ContentPlaceHolderID="NestedContent" Runat="Server"> <br />This is the nested content!<br /> </asp:Content> Figure 15-16 shows the result.

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IIS is a web server geared toward serving static files, so it doesn t inherently have the capability to process dynamic ASP, ASP.NET, JSP, or PHP files. It does, however, support an extensible framework called the Internet Server Application Programming Interface (ISAPI) that allows for plug-ins that can handle dynamic files. IIS hosts various ISAPI extensions in its own memory space and allows you to map certain file types to certain extensions. If a request for an ASP 3.0 page comes through, IIS knows to send it to the ASP 3.0 ISAPI extension. If a request for an ASP.NET page (or related resource) comes through, IIS knows to send it to the ASP.NET ISAPI extension (see Figure 12-8).

You can use as many layers of nested master pages as you want. However, be careful when implementing this approach although it sounds like a nifty way to make a modular design, it can tie you down more than you realize. For example, you ll need to reword your master page hierarchy if you decide later that the two website sections need similar but slightly different headers. For that reason, it might be better to use only one level of master pages and copy the few common elements. In most cases, you won t be creating many master pages, so this won t add a significant amount of duplication.

Caution Another significant issue with nested master pages is the lack of design-time support. In the previous example, you ll be able to access the design surface only for the root master page. You ll need to code the secondlevel master page and the content page by hand.

Figure 12-8. ISAPI application mappings. Notice that .asp pages are sent to the asp.dll for processing and .aspx pages are sent to the aspnet_isapi.dll for processing. Most ISAPI extensions process their dynamic files directly from the ISAPI extension hosted in the IIS process. This means that an exception in the ISAPI extension could extend into the IIS process causing the entire process to crash, and ultimately cut off all access to the web server until IIS can restart. This is bad. Microsoft designed ASP.NET to avoid crashing the IIS process by running the core ASP.NET compilation and execution functionality in an entirely different

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