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Delegation involves impersonation on a local computer and authentication of the impersonated account on a remote computer. Delegation requires two things: an authentication mechanism that supports delegation and credentials that are valid on both the local and remote computer. If you have an account that is valid on both computers, but was authenticated using a nondelegable authentication mechanism, then delegation fails. If you have an account that isn t valid on both computers, then it won t matter that the authentication mechanism supports delegation. Basic- and Kerberos Authentication both support delegation. Delegation is also supported when you enter credentials in a configuration file, as you do with application-level impersonation. Digest- and NTLM Authentication don t support delegation. If you need to use delegation, you should use application-level impersonation or user-level impersonation with IIS configured to use Basic- or Integrated Windows Authentication. Integrated Windows Authentication attempts to use Kerberos Authentication when possible, but falls back on NTLM if Kerberos isn t supported. Kerberos Authentication must have the appropriate Active Directory entries to allow delegation, but those configuration settings are beyond the scope of this book. You can create accounts that both the local and remote machine can understand in one of two ways. The first method is to create identical local accounts. Identical local accounts are two accounts on two separate machines, but both accounts have the same username and password. This allows both machines to independently verify the credentials and authenticate the user. The second option is to use an Active Directory account and allow both the local and remote computer to authenticate against the Active Directory. Because both machines are authenticating the same credentials against the same source, authentication succeeds. Figure 12-22 shows how to and how not to configure accounts to support delegation.

Summary

Once we pull out the data, we store it immediately in ViewState via the Text property so the control can remember what was sent to it as well as render the correct HTML for the <input> tag with the value filled in upon return to the browser The LoadPostData() routine closes by returning false, because it does not need to have RaisePostDataChangedEvent() called, as no events are implemented..

This chapter considered the role that Visual Studio can play in helping you develop your web applications. At the same time that you explored its rich design-time environment, you also learned about how it works behind the scenes with the code-behind model and how to extend it with timesaving features such as macros. In the next two chapters, you ll jump into full-fledged ASP.NET coding by examining web pages and server controls.

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Microsoft recommends that you allow the ASP.NET worker process to run using the default ASPNET account in IIS 5 or Network Service in IIS 6 because this account is preconfigured for least-privileged access. If you need an application to run using a different security context, you should use application-level impersonation. Of course, if you have a compelling reason to change the worker process account, you may do so in the <processModel> element in the Machine.config file as shown in Listing 12-10. Listing 12-10. Configuring an Account to Run the ASP.NET Worker Process <configuration> <system.web> <processModel userName="user" password="pwd" /> </system.web> </configuration> Once again, don t make changes to the Machine.config file lightly, and always make sure you back up your changes in case something goes awry. Next, we ll take a look at encryption and how to protect secure information from prying eyes.

The infrastructure presented in the first part of this chapter provides the fundamentals for localizing any type of .NET-based application, including Windows applications, class libraries, services, and (of course) web applications. Before you learn about the technical details for localizing applications, we will discuss the major challenges in doing do. Figure 17-5 shows some challenges of localizing a web application.

The Postback Data web form is identical to the previous Label Controls demonstration except for removal of the ASP.NET TextBox control and substitution of the one we just created. It has the button setup you have become familiar with: one button sets the value of the labels, and the other button recycles the form to exercise ViewState. Because the Textbox control receives its own postback data, we do not need to set its value in the code-behind class explicitly or worry about maintaining its state. The initial page in Figure 3-11 looks identical to the previous web form that demonstrated our labels. Our Textbox control performs admirably well as a substitute for the ASP.NET builtin version of the control. Listings 3-9 and 3-10 contain the source code for this demonstration.

Figure 17-5. Sample application showing localization challenges Although this is a simple example, it demonstrates some of the core challenges for localizing web applications. The simplest challenge, of course, is localizing the strings for the captions of the labels as well as the buttons. Also, you must localize the format for the currency values and for the dates and times. For that purpose, you need to localize the validation expression of the validation control. Finally, when parsing the information in the code for storing it in a database or for other processing steps, you need to consider the format for dates, times, and currency values. All these values might be different and therefore customized from culture to culture.

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