generate barcode using vb.net 1: Introducing .NET in Visual Basic .NET

Paint Quick Response Code in Visual Basic .NET 1: Introducing .NET

1: Introducing .NET
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The public members of a TV are generally easy to use: the power button, channel selector, volume control, and so on. They are the conduits through which the user controls the data values of the TV (its video and audio output). There are also hidden members inside the TV; you could use these members to impact the picture and sound quality, although this would be a bad idea for most users. You don t want me messing with the internal members of your TV set, trust me. In the same way, an object doesn t want code outside the object to mess with its internal members except through the public members. I don t care how a TV works internally, as long as I can get pictures and sound out of it by using the controls that are exposed (power, channel, volume).
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Objects and Interfaces
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The public members of an object represent its interface. If code outside the object wants to manipulate the data belonging to that object, it uses the members of the interface. It doesn t have to figure out the hidden members or how they work, and that s good. It s especially good if those internal members ever change for any reason, which happens more often than you think. Consider how the internals of TVs have changed just in the past 30 years. Here s a drawing of the TV my family had when I was a kid. Compare it to modern flat-panel TVs available today (see Figure 1-2). My family s TV was cool. It had an AM/FM stereophonic hi-fi radio, a turntable that could play 33 1/3, 45, and 78 rpm records, and a large 19-inch screen with a vivid, black-and-white, crystal-clear display. Two kids could hide behind it when playing hide-and-seek. And my friend who had the same model said that you could draw these really cool permanent lines on the screen with a magnet. Who cares that the speaker panels looked like vertical shag carpet Who cares that the unit took up 30% of the floor space in the room Who cares that you could cook sausages on top of it from the heat generated by the vacuum tubes It was more than a TV; it was an entertainment center.
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The .NET Object |
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The TV of my childhood
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A newfangled thing
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Now compare it to the wimpy little flat-panel job on its right. If you look closely, you find that the interface to the TV hasn t really changed much in three decades. There are still controls for power, volume, and channel selection (although Horizontal Hold and Vertical Hold are gone, sniff). What has changed is the internal configuration. Gone are the humming vacuum tubes, all replaced with efficient transistors and solid-state components. But it doesn t really make much difference to the TV viewer, since the public interface remains the same. Objects in OOP development work in the same way. As long as the public interface remains the same, the object s actual code and internal data storage system also known as the object s implementation can change with no impact to the overall application.
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Objects and Instances
The interface and implementation of an object really represent only its design; these are the parts the programmer creates through the source code. They exist even before the program is compiled and installed on the user s computer. In fact, at this level, objects really aren t even known as objects. In most languages (including Visual Basic), the word class indicates the implementation of an object s interface. Once your application is installed on a computer and starts up, the code creates instances of the class to store actual data in memory. These instances are the true objects of OOP development. Depending on how your code is written, a single class implementation might be used to create one or even hundreds of objects in memory at the same time.
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