INTRODUCING VISUAL BASIC in .NET

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INTRODUCING VISUAL BASIC
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CODE EDITOR WINDOW If you select Code View within the Project Window, or if you double-click on a control icon within the Form Design Window, the Code Editor Window will open, displaying the Visual Basic code associated with the currently active form. Fig. 1.4 shows the Code Editor Window containing two different event procedures (i.e., the Visual Basic code associated with two different command buttons). Ignore the individual Visual Basic instructions for now. Notice, however, the two list boxes at the top of the window. The leftmost list box (showing Command2 in Fig. 1.4) is the Object Listbox; it allows you to select the event procedures associated with a particular object (e.g., a particular command button, form, label, text box, etc.). The rightmost list box (showing Click in Fig. 1.4) is called the Procedure Listbox; for the current object, it allows you to select the event procedure associated with a particular type of event (e.g., Click, DragDrop, KeyDown, MouseDown, etc.).
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Fig. 1.4 The Code Editor Window containing two event procedures
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FORM LAYOUT WINDOW The Form Layout Window allows you to specify the screen location of the forms within a project. To change the form location, simply drag the form icon to the desired position. IMMEDIATE WINDOW The Immediate Window is very useful when debugging a project. Whenever you enter a variable or expression within this window, the corresponding value will be shown immediately. REPOSITIONING, RESIZING, DELETING, ADDING, AND DOCKING WINDOWS Any of the individual windows can be repositioned (by activating the window and then dragging it to the desired location), resized (by activating and then dragging an edge or corner), and deleted (by clicking on the in the upper right corner). A window can be added by selecting the window name from the View menu. The interface may become messy if several windows have been moved and/or resized. When this happens, Visual Basic allows the windows to be returned to their orderly, preassigned position. This is called docking. Docked windows are always aligned alongside their neighbors, and they are always visible. To dock a window that has been moved from its preassigned position, simply double-click on the window s title bar. For any window, docking can be overridden by selecting Options/Docking from the Tools menu, and then selecting or deselecting the appropriate check boxes.
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1.9 OPENING AN EXISTING VISUAL BASIC PROJECT We have already seen that an existing project can be accessed by locating the project name listed under the Existing or the Recent tab within the New Project window (see Fig. 1.2), or by locating the project via File/Open Project. Once the project is opened, however, the Form Design Window may not be visible within the Project Container Window. To access the Form Design Window, you may have to expand the Forms icon within the Project Window as shown in Fig. 1.5, and then select the desired form. Double-click on the form icon to show the Form Design Window.
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Fig. 1.5 Activating a form within the Project Container Window
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1.10 SAVING A VISUAL BASIC PROJECT Saving a project can be tricky in Visual Basic because it involves saving multiple files. To save a new Visual Basic project for the first time, choose Save Project As from the File menu. You will be prompted separately for a form name (i.e., the name of the .frm file) and a project name (the .vbp file). Usually, the same name is given to both files. To save an updated version of a previously saved project, click on the Save Project button in the Toolbar (see Fig. 1.6), or select Save Project from the File menu. This will cause the current version of the project files to be saved under their existing names.
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Fig. 1.6 The Standard Toolbar To save a previously saved project under a different name (this is the tricky part), you must save each file separately under its new name. Thus, you should first save each form file under the new name, and then save the project file under the new name. If you simply save the project file under a different name, the form files will retain their old names; this may cause problems when switching between the old version and the new version of the project.
1.11 RUNNING A VISUAL BASIC PROJECT To execute a Visual Basic project, simply click on the Start button in the Toolbar (see Fig. 1.6), or select Start from the Run menu. The execution can be temporarily suspended by clicking on the Break button, or by selecting Break from the Run menu. The execution of a paused project can then be resumed by clicking on the Run
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