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When it first appeared, it created a revolution in Windows programming. Visual Basic introduced unheard-of ease to Windows programmingjust build the program you want, right before your eyes, and then run it. In so doing, it changed programming from a chore to something very like fun.
In time, Visual Basic has gotten more complex, as well as more powerful. Today, it's more complex than ever, and if you've used Visual Basic 6. In this book, you'll see how to use Visual Basic in a task-oriented way, which is the best way to write about programming. Instead of superimposing some abstract structure on the material in this book, I'll organize it the way programmers want ittask by task. I'll start with an overview of Visual Basic, taking a look at topics common to the material in the rest of the book.
In this chapter, we'll create the foundation we'll rely on later as we take a look at the basics of Visual Basic. This includes learning how to create Visual Basic projects, seeing what's in such projects, seeing what's new in Visual Basic. NET, getting an overview of essential Visual Basic. NET concepts such as Windows and Web forms, controls, events, properties, methods, and so on.
Note, however, that I'll assume you have at least a little experience with Visual Basic and programming in this chapter. The IDE is what you see when you start Visual Basic, and it's where you develop your applications and debug them.
Understanding the IDE and how to use itand mastering some fundamental Visual Basic conceptswill give us the foundation we need for the rest of the book. Many Visual Basic programmers do not have formal programming training, so they have to learn a lot of this material the hard way.
As programming has matured, programmers have learned more about what are called "best practices"the programming techniques that make robust, easily debugged programs.
We'll take a look at those practices in this chapter, because they are becoming more essential for programmers in commercial environments these days, especially those programmers who work in teams. And we'll look at those practices from the viewpoint of programmers who program for a living, because frequently there's a gap between the way best practices are taught by academics and how they are actually needed by programmers facing the prospect of writing a 20, line program as part of a programming team.
Before we start covering all the details in Visual Basic in depth, let's take a look at an example first. Rather than getting lost in the details, let's see Visual Basic at work immediately. Because there are so many details one has to master, it's easy to forget that Visual Basic is there to make things as easy as possible for you.
In fact, as stated earlier, programming in Visual Basic can be as close to fun as programming gets. I'm not going to go into the details here, because we'll cover them later in this chapterright now, let's just have a little fun.
Figure 1. Generally speaking, there are three types of applications in Visual Basicthose based on Windows forms such applications are usually local to your machine , Web forms that come to you across the Internet , and console applications that run in a DOS window.
I'll take a look at Windows forms here first, as those will be the most familiar to Visual Basic 6. Creating a Windows Application To create an application based on Windows forms, select the New item in the File menu, then select the Project item in the submenu that appears. This brings up the New Project dialog box you see in Figure 1. Now click the OK button to create this new Visual Basic project.
Visual Basic creates a new Windows project and gives you the result you see in Figure 1. The window you see at the center of Figure 1. The genius of Visual Basic has always been that it's visual, of course, which means that you can design your applications visually.
In this case, I'll just add two Windows controls to this forma text box and a button.
When you click the button, the application will display the text "Hello from Visual Basic" in the text box. Controls, of course, are user-interface elements that you see in Windows all the time, such as list boxes, scroll bars, button, menus, and so on. To add a text box to Form1, first make sure that the Visual Basic toolbox is open.
You can see the toolbox to the left of Form1 in Figure 1. Now click the Windows Forms item in the toolbox so the toolbox displays the possible controls you can use in Windows forms, such as text boxes, buttons, labels, link labels, and so on. In a move that's very familiar to Visual Basic programmers, you can now simply drag a text box from the toolbox to Form1, or just double-click the TextBox entry in the toolbox. This adds a text box to Form1; position and stretch it with the mouse until it appears roughly as you see in Figure 1.
The boxes you see around the text box are sizing handles, and if you've used Visual Basic at all, you know you can use them to change the shape of the text box. Next, add a button to Form1 in the same manner, as illustrated in Figure 1. Visual Basic 6. These are the controls that will appear in our application.
The next step is to customize them; in this case, start by changing the caption of the button from "Button1" to "Click Me. Next, move to the Properties window at the lower right of the IDE; this lists the properties of the currently selected control or object if you can't see the Properties window, select the View Properties Window menu item. Click the Text property no longer the Caption property of Visual Basic 6.
You set properties of objects such as this button to customize them, and we'll be doing so throughout the book. The Properties window lists properties like the Text property on the left and their values on the right; to change a property's value, you only have to edit its setting and press Enter.
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