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NET will throw an exception if a developer or user attempts to put such a control outside an HTML <form> tag The IPostBackDataHandler interface is implemented by our LoadPostData() and RaisePostDataChangedEvent() methods RaisePostDataChangedEvent() is blank, because we are not emitting events from our control based on state changes, but it still must be present to satisfy the terms of the interface In the next chapter, we go further into raising our own events and examine what kind of code you would normally put into the RaisePostDataChangedEvent() LoadPostData() has the necessary logic to read the information posted by our <input type="text"> tag rendered in the HTML document LoadPostData() uses the passed-in key to read from the postCollection collection passed into the routine The type of the collection is NameValueCollection, so you can expect a string value to be passed back when you access the data with your key.

User-level impersonation forces the thread processing the request to run under the security context of the authenticated user from IIS. User-level impersonation resembles applicationlevel impersonation, but you don t need to specify account credentials because IIS provides the account information for user-level impersonation (see Listing 12-9). Listing 12-9. User-Level Impersonation <configuration> <system.web> <identity impersonate="true" /> </system.web> </configuration> Remember, user-level impersonation may cause database performance issues because it can have an adverse effect on connection pooling.

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Figure 2-29. The ASP .NET Development Helper To download the ASP.NET Development Helper, surf to http://www.nikhilk.net/ ASPNETDevHelperTool.aspx. There you can download two DLLs, one for the HTTP module (WebDevInfo.dll) and one for the browser plug-in (WebDevInfo.BHO.dll). Copy these to any directory. Then, install the browser extension with the following command line: regsvr32 nStuff.WebDevInfo.BHO.dll Next, you need install the assembly for the HTTP module into the GAC. You can do this by dragging and dropping in Windows Explorer, but it s generally easier to use the gacutil.exe utility. Start a Visual Studio command prompt (choose Programs Visual Studio 2005 Visual Studio Tools Visual Studio 2005 Command Prompt from the Start menu), and then run this command: gacutil /i nStuff.WebDevInfo.dll

Now, when you want to use this tool with a web application, you need to modify the web.config file so it loads the HTTP module. The content you need depends on the exact version of the tool you re using, but it looks something like this: <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <system.web> <httpModules> <add name="DevInfo" type="nStuff.WebDevInfo.DevInfoModule, nStuff.WebDevInfo, Version=0.5.0.0, Culture=neutral, PublicKeyToken=8fc0e3af5abcb6c4" /> </httpModules> ... </system.web> </configuration> Now, run one of the pages from this application. To actually call up the browser plug-in, look for a button (with a gear icon) in the browser, which will have been added to the end of the Standard toolbar. When you click this icon, you ll see a display like the one shown in Figure 2-29 (assuming you re currently viewing an ASP.NET page from an application that has the matching HTTP module loaded). You ll see the ASP.NET Developer Helper at work in 3.

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