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public class BrowserSpecificAttribute : ActionFilterAttribute { public string Firefox {get; set;} public string InternetExplorer {get; set;} ... public override void OnResultExecuting(ResultExecutingContext filterContext) { ... } }

The first Set statement creates a new instance of MyClass, whereas the second Set statement merely creates a second pointer to the same object created by the first statement. This means that the following statements will do the same thing because both ObjectA and ObjectB point to the same object:

Tip Restricting users to client applications means they cannot run their own Internet serv ers, such as Web and FTP servers.

Another method of restricting the applications that people can use to access the Internet is to filter the packets passing over the Internet connection based on their ports. Every TCP/IP packet contains a source port number that identifies the application that generated it and contains a destination port number that identifies the receiving appli cation. The port numbers are included in the packet s transport layer protocol header.

Because ObjectB still points to the object, it will remain in memory until ObjectB is also set to Nothing.

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Web servers communicate with clients using the Hypertext Transfer Protocol (HTTP), and HTTP uses port number 80. If you create a port filter on your network stopping all traffic addressed to port 80, your computers can t send HTTP requests to Web servers and therefore can t access Web sites. Port filtering does not prevent the user from actually running the Web browser, but it does prevent the browser from communicating with servers on the Internet. To create packet filters, you use a firewall or a router with packet filtering capabilities. If you use a computer running Windows Server 2003 as the router connecting your network to your ISP, you can create packet filters in the RRAS module.

Using the attribute couldn t be easier. All you need to do is decorate the controller method with the attribute, as shown here:

Associated with every object is a collection of properties, methods, and events, which are used to communicate information between the object and the routine that created the object.

In most organizations with Internet connections, there are different types of users who require varying degrees of Internet access to perform their jobs. In your own Internet access plan, you might want to provide all the network s users with e-mail capabilities but restrict Web browsing to a certain group of users and FTP capabilities to still another group.

The individual parts of a class can be labeled as either Public or Private. Anything marked as Public is visible to anyone using the class, whereas anything marked as Private can be accessed only from the code within the class. Tip

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3

Don t Rely on Defaults Always explicitly mark everything within a class as either Public or Private, so you never have to worry about whether something defaulted to Public or Private.

[BrowserSpecific] public virtual ActionResult Index() { ... }

There are two methods you can use to provide different levels of Internet access for indi vidual users. The first is to use packet filtering. In addition to filtering packets based on port numbers, you can filter them based on IP addresses. By combining these two filter types, you can specify the ports that each computer on the network is permitted to use.

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