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So if you define your own attribute classes, you must also implement some code that checks for the existence of an instance of your attribute class (on some target) and then execute some alternate code path . This is what makes custom attributes so useful! The FCL offers many ways to check for the existence of an attribute . If you re checking for the existence of an attribute via a System.Type object, you can use the IsDefined method as shown earlier . However, sometimes you want to check for an attribute on a target other than a type, such as an assembly, a module, or a method . For this discussion, let s concentrate on the methods defined by the System.Attribute class . You ll recall that all CLS-compliant attributes are derived from System.Attribute . This class defines three static methods for retrieving the attributes associated with a target: IsDefined, GetCustomAttributes, and GetCustomAttribute . Each of these functions has several overloaded versions . For example, each method has a version that works on type members (classes, structs, enums, interfaces, delegates, constructors, methods, properties, fields, events, and return types), parameters, modules, and assemblies . There are also versions that allow you to tell the system to walk up the derivation hierarchy to include inherited attributes in the results . Table 18-1 briefly describes what each method does .

Supported Authentication Protocol MS-CHAP, CHAP, SPAP, and PAP MS-CHAP, CHAP, SPAP, PAP, and MS-CHAP v2 (with Windows 98 Service Pack 1 and later) MS-CHAP, CHAP, SPAP, and PAP (with the Windows Dial-Up Networking 1.3 Performance & Secu rity Upgrade for Windows 95 and later) Unsupported Authentication Protocol MS-CHAP v2, and EAP EAP

For the exam, remember that Windows 95 does not support MS-CHAP v2 over dial-up connections. Also remember that EAP is supported only by Windows Server 2003, Windows XP and Windows 2000. ,

TABLE 18-1

Table 6-1 compares the functionality of .NET's System.Exception class with that of the Java java.lang.Throwable class. Although not a part of either language specification, the use of exceptions is tightly integrated with both Java and C# and is appropriate to this chapter. Java and .NET both rely on the exception inheritance hierarchy as a classification mechanism to support the use of the catch clause.

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To view or modify the authentication protocols enabled for a dial-up connection on the remote access client, open the properties dialog box of the dial-up connection on the client, and click the Security tab. Figure 10-7 shows the default settings on the Security tab: the Typical (Recommended Set tings) option is selected, and the Allow Unsecured Password setting is selected. If you click the Advanced (Custom Settings) option and then click the Settings button, the Advanced Security Settings dialog box opens. This dialog box, also shown in Figure 10-7, reveals the specific authentication protocols enabled by the current setting. Notice that the unencrypted authentication protocol PAP is enabled. The authentication protocol SPAP is also enabled. Although it encrypts authentication data, SPAP is not considered secure because it always sends each password over the network in the same reversibly encrypted form. Thus, the protocol is susceptible to replay attacks.

Returns true if there is at least one instance of the specified Attribute-derived class associated with the target . This method is efficient because it doesn t construct (deserialize) any instances of the attribute class . Returns an array in which each element is an instance of the specified attribute class that was applied to the target . If no attribute class is given to the method, the array contains the instances of all applied attributes, whatever class they have . Each instance is constructed (deserialized) by using the parameters, fields, and properties specified during compilation . If the target has no instances of the specified attribute class, an empty array is returned . This method is typically used with attributes that have AllowMultiple set to true or to list all applied attributes . Returns an instance of the specified attribute class that was applied to the target . The instance is constructed (deserialized) by using the parameters, fields, and properties specified during compilation . If the target has no instances of the specified attribute class, null is returned . If the target has multiple instances of the specified attribute applied to it, a System.Reflection. AmbiguousMatchException exception is thrown . This method is typically used with attributes that have AllowMultiple set to false .

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