Introduction to Visual Basic Programming

Introduction to Visual Basic Programming

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  CHAPTER 1: INTRODUCTION TO VISUALBASIC
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  Objective Learn to designand develop Windows-based applications using Visual Basic.NET programs that meet commercial programming standards. At the end of this course, your program design and coding should be satisfactory. VB supports programming projects that run in both:  Microsoft Windows and,  Web (Internet) environments. This course focuses on the Windows operating system(s).
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  What is VISUALBASIC? • Visual Basic is a high level programming language which evolved from the earlier DOS version called BASIC. • BASIC means Beginners' All-purpose Symbolic Instruction Code. • It is a very easy programming language to learn. • Visual Basic allows you to develop Windows (Graphic User Interface - GUI) applications that have a familiar appearance to the user.
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  Running environment Modern programsrun in a Graphical User Interface (GUI) environment. You can open up any desktop program or web browser and examine the GUI. This interface includes:  Buttons (some with Icons and Graphical Images) and Menus on which you point and click.  TextBox controls in which you type information.  Graphical images to guide a system user in using the program.  Other components.
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  Object-Oriented Programming Terminology VBis an object-oriented programming language.  Means you work with objects in building an application.  Examples: Form objects, Button objects, TextBox objects, Label objects, PictureBox objects, and more. VB is also termed an event-driven programming language.  Means you will write program code that responds to events controlled by the user.  Example events include: clicking a button or menu, opening or Closing a form, moving the mouse over the top of an object.
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  Object-Oriented Programming Terminology Inorder to work with VB, you need to understand "object" terminology as defined in the following table. Object-Oriented Programming Terminology table Terminology Definition Object A thing – like a noun in English. Examples include forms and controls you place on forms such as buttons, text boxes, and icons. Properties Objects have properties – like adjectives in English. Properties describe object behaviors. Examples of properties include Text, Name, BackColor, Font, and Size. Method Like a verb in English – these are the actions that objects exhibit. Examples include methods to Show and Hide forms and methods to Print and Close forms. Event Events are actions usually triggered by the system user such as clicking a button; however, events can also be triggered by the actions of objects. Class This is a really abstract term – it is a sort of template for an object. For example, all forms belong to the Form class of object. All buttons belong to the Button class of object. Classes include definitions for object properties, methods, and associated events.
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  Some features ofVisual Basic  Full set of objects - you 'draw' the application;  Lots of icons and pictures for your use;  Response to mouse and keyboard actions;  Clipboard and printer access;  Full array of mathematical, string handling, and graphics functions;  Can handle fixed and dynamic variable and control arrays;  Sequential and random access file support;  Useful debugger and error-handling facilities;  Powerful database access tools;  ActiveX support;  Package & Deployment Wizard makes distributing your applications simple.
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  Different version ofVisual Basic  Visual Basic 1.0 for DOS was released in September 1992.  Visual Basic 2.0 was released in November 1992.  Visual Basic 3.0 was released in the summer of 1993 and came in Standard and Professional versions.  Visual Basic 4.0 (August 1995) was the first version that could create 32-bit as well as 16- bit Windows programs. It has three editions; Standard, Professional, and Enterprise. It also introduced the ability to write non-GUI classes in Visual Basic.  With version 5.0 (February 1997), Microsoft released Visual Basic exclusively for 32-bit versions of Windows.  Visual Basic 6.0 (Mid 1998) improved in a number of areas including the ability to create web-based applications.
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  Derivative languages • VisualBasic for Applications (VBA) is included in many Microsoft applications (Microsoft Office), and also in many third-party products like AutoCAD, and Business Objects Desktop Intelligence. • VBScript is the default language for Active Server Pages. It can be used in Windows scripting and client-side web page scripting. • Visual Basic .NET is Microsoft's designated successor to Visual Basic 6.0, and is part of Microsoft's .NET platform. • StarOffice Basic is a Visual Basic compatible interpreter included in StarOffice suite, developed by Sun Microsystems. • Gambas is a Visual Basic inspired free software programming language.
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  Structure of aVisual Basic Application • Forms - Windows that you create for user interface • Controls - Graphical features drawn on forms to allow user interaction (text boxes, labels, scroll bars, command buttons, etc.) (Forms and Controls are objects.) • Properties - Every characteristic of a form or control is specified by a property. Example properties include names, captions, size, color, position, and contents. Visual Basic applies default properties. You can change properties at design time or run time.
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  Structure of aVisual Basic Application • Methods - Built-in procedure that can be invoked to impart some action to a particular object. • Event Procedures - Code related to some object. This is the code that is executed when a certain event occurs. • General Procedures - Code not related to objects. This code must be invoked by the application. • Modules - Collection of general procedures, variable declarations, and constant definitions used by application.
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  Structure of aVisual Basic Application
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  Getting Started withVisual Studio
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  New Project dialogbox
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  Configure new project
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  The Integrated DevelopmentEnvironment (IDE) • Toolbars with shortcut icons are shown below the menus. • Form Designer also termed the Document Window (Displays open documents such as the Form1 shown in the figure) • Solution Explorer Window – displays filenames for files that comprise a project. • Properties Window – displays properties of the currently selected object. • ToolBox Window – this is shown along the left edge of the figure in collapsed display. (Next Slide) • Across the top are menus with different options used in the designing of an application.
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  The Tool Box
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  Steps in developingapplication There are three primary steps involved in building a Visual Basic application: • Draw the user interface • Assign properties to controls • Attach code to controls We will look at each step.
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  My first programin VB
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  My first programin VB
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  My first programin VB
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  End of theintroduction As much as possible try to get use to the development environment.