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Comments
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Change the line of code
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MeText = "Eat at Joe's"
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to instead read as follows:
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MeText = "Eat at Joe's" 'Changes text in title bar
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The program will run exactly the same In fact, the code has not changed at all The portion of the line beginning with an apostrophe ( ) followed by Changes text in title bar is a comment The apostrophe indicates that it and what follows it on the line are not part of the code, but rather a comment A comment is for the benefit of a programmer reading the code, the purpose usually being an explanation of the code An explanation may not be necessary for a line of code changing the value of the text shown in a form s title bar However, as your applications become more complex, explanations may be helpful to fellow programmers who need to review your code Indeed, you may find your own explanation of your own code helpful to refresh your memory if you have to return to your code months after you wrote it, either to enhance the code or to fix a problem
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Writing Your First Code
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Conclusion
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Visual Basic, like other programming languages, represents each person, thing, or concept that is the subject of an application as a class Objects are created, or instantiated, from classes A class, and therefore the objects created from the class, usually have properties and events A property is an attribute of an object, such as its height An event is something that happens to an object, such as being clicked A Windows application is displayed in a window that has a graphical user interface (GUI) Additionally, Windows applications are event-driven in that the user s actions, such as clicking a mouse, create events that cause the operating system to send messages to the application You can write code that will run when those messages are received That code is written inside an event procedure, which executes, or runs, when a specified event happens to an object So far the GUI of our Windows application consists only of the form itself We will add to that GUI in the next chapter
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Quiz
Recognizing Barcode In VS .NET
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1 What is designer view 2 What is code view 3 What is a class in a programming language 4 What is an object of a class 5 What are namespaces used for 6 What is a property of a class 7 What are characteristics of a Windows application 8 What is an event of a class 9 What is an event procedure 10 What is the purpose of the assignment operator
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CHAPTER
Controls
Thus far we have focused on the Form class The form is an important part of your application s GUI, perhaps the most important one However, a form cannot possibly meet all the requirements of a Windows application For example, the form does not have the functionality to permit typing of text, listing of data, selection of choices, and so forth You need other, specialized controls for that additional functionality Indeed, the form s primary role is to serve as a host, or container, for other controls that enrich the GUI of Windows applications, such as menus, toolbars, buttons, text boxes, and list boxes You will learn in this chapter how to add controls to your form using the Toolbox You then will learn how to change the size or location of the controls on the form These controls, like the form itself, have their own properties, which can be changed both at design time and at run time This chapter will provide you with guidelines on whether to assign values at design or run time in a given situation This chapter culminates with a project that uses a particular control, the Label control, for two purposes: first, to display data that does not change during the running of the application and, second, using event procedures, to display data that does change during the running of the application This project also shows you how to use information, called parameters, available to an event procedure
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