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Cache Dependencies in SQL Server 2005
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As mentioned, the SqlCacheDependency class has two constructors, one of which takes a SqlCommand object as its sole argument:
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// data is a DataTable filled using this same command SqlCommand cmd = new SqlCommand( SELECT * FROM Customers WHERE country= USA ", conn); SqlCacheDependency dep = new SqlCacheDependency(cmd); Cache.Insert( SqlSource", data, dep);
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When called in this way, the SqlCacheDependency class sets up a dependency relationship with SQL Server 2005 known as command notification. (See 5.) As a result, whenever something happens to the involved tables that modifies the output of the command, the notification is sent to the caller. Nicely enough, the caller this time is just the SqlCacheDependency class. Internally, the SqlCacheDependency class handles the event and lets the parent know through NotifyDependencyChanged.
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9 State Management
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In ASP.NET 2.0, state management is much the same as in ASP.NET 1.x. Sure, you get a few cool new features, but the underlying architecture is nearly identical. In most cases, the changes are ones that would have fit into version 1.x if the team had had more time. Overall, the new state management features are in response to user requirements or are necessary enhancements. For example, control state was introduced to avoid common errors and pitfalls in control development. The new session and cache features clearly resulted from repeated user requests, particularly the database cache dependency (which is available only for SQL Server 7.0 and later). You cannot use the SqlCacheDependency class to control changes to an Oracle or a Microsoft Access database. However, the cache dependency mechanism has been abstracted enough that smart developers can write custom invalidation mechanisms.
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ASP.NET Security
To restrict access to a Web site to registered users, an ASP.NET developer can choose between three authentication types Windows (the default), Passport, and Forms authentication. The type of authentication is declared in the application s configuration file and can t be changed dynamically. When you use Windows authentication, information about users and groups is often stored in the Security Accounts Manager (SAM) database, but you can also place that information in the care of the Active Directory services. With Passport authentication, user information is stored in the internal Passport database. And with Forms authentication, you can specify where to store user and role data. Typically, it goes in a custom database. Windows authentication is commonly used in intranet scenarios. Like Passport authentication, it provides the user interface and back-end code needed to collect and verify user credentials. The developer doesn t have to know about the structure of the data storage or how users and roles are checked. The identity of the application s logged-in user is any authenticated identity passed in from Microsoft Internet Information Services (IIS). For Internet applications, this model is often inadequate; Passport and Forms authentication are better choices. The Passport authentication mechanism is a Microsoft centralized authentication service. Passport provides a way to authenticate users coming across all the sites that participate in the initiative. Users do a single login, and if they are successfully authenticated they can move freely through all the member sites. In addition to the single login service, Passport also offers core profile services for member sites. The Passport authentication service is used throughout the industry. Neither Windows authentication nor Passport authentication is practical for real-world Web sites. In ASP, you typically place some relatively boilerplate
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Part III
Application Services
code on top of each nonpublic page and redirect the user to a login page. On the login page, the user is prompted for credentials, and the credentials are verified against a list of authorized users. If all goes fine, the user is redirected to the originally requested page. None of this code is rocket science, but you have to write it yourself and use it over and over. ASP.NET 1.x introduced Forms-based authentication, a built-in infrastructure with an easy-to-use API that greatly simplifies the setting up of this login pattern. Forms-based authentication is probably the only viable approach to restricting access to real-world Web sites. In ASP.NET 2.0, the custom Forms authentication engine is even easier and quicker to use.
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