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Furthermore, you ll notice the CLR offers an accessibility called Family and Assembly . However, C# doesn t expose this in the language . The C# team felt that this accessibility was for the most part useless and decided not to incorporate it into the C# language . When a derived type is overriding a member defined in its base type, the C# compiler requires that the original member and the overriding member have the same accessibility . That is, if the member in the base class is protected, the overriding member in the derived class must also be protected. However, this is a C# restriction, not a CLR restriction . When deriving from a base class, the CLR allows a member s accessibility to become less restrictive but not more restrictive . For example, a class can override a protected method defined in its base class and make the overridden method public (more accessible) . However, a class cannot override a protected method defined in its base class and make the overridden method private (less accessible) . The reason a class cannot make a base class method more restricted is because a user of the derived class could always cast to the base type and gain access to the base class s method . If the CLR allowed the derived type s method to be less accessible, it would be making a claim that was not enforceable .

6

The Microsoft .NET Framework includes support for configuring applications by using XML configuration files; this appendix demonstrates how to make use of these.

There are certain classes that are never intended to be instantiated, such as Console, Math, Environment, and ThreadPool. These classes have only static members and, in fact, the classes exist simply as a way to group a set of related members together . For example, the Math class defines a bunch of methods that do math-related operations . C# allows you to define non-instantiable classes by using the C# static keyword . This keyword can be applied only to classes, not structures (value types) because the CLR always allows value types to be instantiated and there is no way to stop or prevent this . The compiler enforces many restrictions on a static class:

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nod2 novc noignoretc port=53 type=A class=IN timeout=2 retry=1 root=A.ROOT-SERVERS.NET. domain=domain1.local MSxfr IXFRversion=1 srchlist=domain1.local >

The class must be derived directly from System.Object because deriving from any other base class makes no sense since inheritance applies only to objects, and you cannot create an instance of a static class . The class must not implement any interfaces since interface methods are callable only when using an instance of a class . The class must define only static members (fields, methods, properties, and events) . Any instance members cause the compiler to generate an error .

Notice that the first option listed is nodebug. When this option is active, Nslookup output is concise. 5. At the Nslookup prompt, type www.msnbc.com., and press Enter. If you receive a time-out response, type the command again. An output displays the computer name associated with the alias www.msnbc.com, the IP address or addresses resolved from this FQDN, and the alias www.msnbc.com. 6. At the Nslookup prompt, type set d2 and then press Enter. Nslookup enters Verbose Debug mode. 7. At the Nslookup prompt, type set all and then press Enter. Use the output from this command to answer the following question in the space provided. What are two differences between the list of options now and when you first ran the Set All command in step 4

An application configuration file is stored in the same directory as the application it relates to. The file name is the name of the application with a .config extension. For example, an application named MyApplication.exe would have a configuration file named MyApplication.exe.config. For multifile assemblies, the configuration file should be named after the file that contains the manifest. When an application requests configuration information, the common language runtime (CLR) tries to satisfy the request from the global machine configuration file before the application file; that is to say that the machine configuration file overrides the application file. This approach allows machine administrators to redefine the settings for an application after it has been installed; this should not be done lightly and can result in unexpected application behavior. The machine configuration file is named Machine.config and can be found in the Config subdirectory of the .NET Framework installation. The CLR ensures that configuration files are loaded automatically; thus, no action is required by the programmer. Configuration files must contain the root XML node <configuration>, as shown here:

The class cannot be used as a field, method parameter, or local variable because all of these would indicate a variable that refers to an instance, and this is not allowed . If the compiler detects any of these uses, the compiler issues an error .

8. At the Nslookup prompt, type www.msnbc.com., and then press Enter. Be sure to include the trailing dot (.) after the name. You receive a detailed response that includes three sections: a SendRequest() sec tion, a Got Answer section, and a Non-Authoritative Answer section. 9. Locate all three of these sections, and then answer the following questions in the spaces provided. What do each of the first two sections represent

6-15

Here is an example of a static class that defines some static members; this code compiles (with a warning) but the class doesn t do anything interesting:

Applications that require a specific version of the CLR can use the <startup><requiredruntime> declaration, as shown in the following example:

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