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class Subclassed : BaseClass { public new void SimpleMethod() { DebugMgr.start( 10, "Subclassed.SimpleMethod"); DebugMgr.end( 10); } } The class BaseClass defines the method SimpleMethod. The class Subclassed subclasses the BaseClass and redefines the method SimpleMethod. Notice the use of the new keyword. The new keyword is what makes .NET and C# a software-engineering language with useful and consistent inheritance management. When a class subclasses another class and defines a method identical to a method in the subclass, that class is overriding a method. Overriding means that old functionality is replaced with new functionality. Having new functionality potentially results in code that might introduce new problems. To subvert such problems, C# and .NET require the developer to indicate explicitly when a method is overridden. This makes the developer aware that functionality will be altered in some base class. The following code illustrates how to use the defined types: Subclassed subcls = new Subclassed(); subcls.SimpleMethod(); DebugMgr.output( 10, "Now assigning to type BaseClass"); BaseClass basecls = subcls; basecls.SimpleMethod(); The type Subclassed is instantiated and assigned to the variable subcls, which is of the same type. Next, the method SimpleMethod is called, and then a downcast to the subclassed type BaseClass is made and assigned to the variable basecls. The method SimpleMethod is called again. The following output is generated when the sample code is executed: start (Subclassed.SimpleMethod) end (Subclassed.SimpleMethod) Now assigning to type BaseClass start (BaseClass.SimpleMethod) end (BaseClass.SimpleMethod)

Figure 5-49. Two-switch decode My Block It s a good idea to run the test program shown in Figure 5-50 with your two-switch input to make sure that the values you re getting decode properly. The program displays the Raw value and the decoded state of the two switches. You might need to adjust the threshold levels to compensate for the particular resistor values you used.

Identify a folder within your computer to share data from, and allow it to share only from that folder One administrative concern with peer-to-peer file sharing can be its use to illegally upload copyrighted material to other file sharers on the Internet Although preventing this type of traffic by blocking network ports is possible, it can sometimes be a moving target because some of these P2P protocols use random ports dynamically Some Internet appliances and filtering packages can be configured to tag traffic that appears to be P2P, tracking the session based on these tags and thus overcoming any reliance on blocking traffic on any specific port..

When using the new keyword, the functionality used by the consumer is based on the type and the casting. Let s say BaseClass is instantiated. If the instance is downcast to Subclassed, then Subclassed is called because it has an implementation of SimpleMethod. If the instance is cast back to BaseClass, which has its own SimpleMethod implementation, then BaseClass will be called. This is a clean inheritance model because the implementation you execute is based on the cast type.

Over the years, as networks grew, they became unwieldy, making it more difficult to keep tabs on the computers that were linked together. This led to the development of client-server networks. Client-server networks are not ad hoc. Services on client-server networks are statically assigned and centrally managed, and settings on desktops are maintained by servers. Because the network does much of the management of itself through tasks such as assigning IP addresses, warehousing data, and managing bandwidth, client-server networks quickly became the primary weapon in combating unwieldy networks (See Figure 7-2 for a graphical representation of a client-server network.)

A potentiometer, or pot for short, doesn t change in resistance with temperature like a thermistor, or light level like a CdS light-dependent resistor. It changes with the rotation of a mechanical shaft. You re probably already familiar with the device because it s commonly used as the volume control on audio equipment. Rotating the shaft changes the resistance between the center and outer two terminals. It s a kind of self-contained voltage divider. Usually the shaft can rotate only 270 degrees, but multiturn versions are available. Figure 6-1 shows several examples of potentiometers.

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