INTRODUCING VISUAL BASIC in VS .NET

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INTRODUCING VISUAL BASIC
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1.8 THE VISUAL BASIC ENVIRONMENT To enter the Visual Basic environment, click the mouse on the Visual Basic icon which appears on your Windows Desktop. This will result in the opening group of windows shown in Fig. 1.2. You may then enter the workspace for a new project by selecting New/Standard.EXE, or by selecting New Project from the File menu (see below). Or, you may open an existing project by selecting either the Existing tab or the Recent tab, and then selecting the particular project that is of interest. Still another way to open an existing project is to select Open Project from the File menu, and then select the particular project of interest.
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Fig. 1.2 The Visual Basic opening group of windows If you choose to create a new project, you will see a group of windows similar to that shown in Fig. 1.3. The principal items are described below:
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TITLE BAR The top line is called the Title Bar. It includes the project name, an icon that closes Visual Basic at the left, and icons that minimize the group of windows, change the size of the group, or close Visual Basic on the right. We will discuss these icons later, as the need arises. For now, however, note that you can exit from Visual Basic by clicking on the left icon and then selecting Close from the resulting drop-down menu, or by clicking on the rightmost icon ( ).
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INTRODUCING VISUAL BASIC
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MENU BAR The second line is called the Menu Bar. Selecting one of the choices (File, Edit, View, Project, Format, . . . Help) causes one of Visual Basic s drop-down menus to appear. These menus present logical groupings of Visual Basic s individual features. For example, the File menu includes selections for opening new or existing VB projects, saving the project, saving the currently active window, printing the currently active project, running (executing) a Visual Basic project, opening recently accessed projects, and so on.
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Form Design Window Title Bar
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Project Window Toolbar
Project Container Window Toolbox
Properties Window Immediate Window Form Layout Window
Fig. 1.3 The Visual Basic new project environment
INTRODUCING VISUAL BASIC
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TOOLBAR The third line is called the Standard Toolbar. The icons on this line duplicate several of the more commonly used menu selections that are available via the drop-down menus accessed from the Menu Bar. For example, the Standard Toolbar contains icons that will open an existing project; save the current project; cut, copy and delete; undo the most recent changes; start, pause and end program execution; and add/delete windows from the current overall environment. All of these features can be accessed via drop-down menus. Hence, the toolbar icons do not offer any new or unique features, but their use is convenient, since the icon-based features can be selected with a single mouseclick. Other toolbars (Debug, Edit and Form Editor) can be accessed by selecting Toolbars from the View menu. The Standard Toolbar can also be removed in this manner.
FORM DESIGN AND PROJECT CONTAINER WINDOWS The Form Design Window is where the user interface is actually designed. This is accomplished by selecting the desired Control Icons from the Toolbox (see below) and placing them in the Form Design Window. Each control can then be moved (place the mouse over the icon and drag) or resized (activate the icon and drag one of the small surrounding squares), and its properties can be reassigned as required (see below). The entire form (i.e., the entire Form Design Window) can be moved within the surrounding Project Container Window (by placing the mouse over the form and dragging), or it can be resized (by activating the mouse and then dragging one of the small surrounding squares). Both windows can also be closed, minimized, or resized by clicking on the appropriate icons in their respective Title Bars.
TOOLBOX The Toolbox contains icons that represent commonly used controls, such as a label, text box, command button, picture box, frame, check box, option button, file list box, and so on. You can select a control from the Toolbox and place it in the current Form Design Window by double-clicking on the control icon (thus placing the control in the center of the window), or by clicking once on the control icon, then clicking on the desired location within the Form Design Window and dragging the mouse so that the control has the desired size. Once a control has been placed in the Form Design Window, the associated code (i.e., the associated Visual Basic instructions) can be viewed or edited by double-clicking on the control.
PROPERTIES WINDOW We have already learned that every object has properties associated with it. Each object has its own unique list of properties. The Properties Window allows you to assign or change the properties associated with a particular object (i.e., a particular form or control). To do so, active the object by clicking on it; then choose from the corresponding list of properties shown in the left column of the Properties Window. Once you select a property, the adjoining box in the right column may change its appearance, showing a drop-down menu so you can choose from a list of permissible values.
PROJECT WINDOW The Project Window displays a hierarchical list of the files associated with a given project. These files represent individual forms and modules. You can display a form or module within the Project Container Window by double-clicking on the corresponding icon within the Project Window. Also, you can select either the Object View or the Code View by clicking on one of the two leftmost icons within the toolbar at the top of the Project Window.
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