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Microsoft Visual Basic 2010: Reloaded Fourth Edition

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  1. Microsoft Visual Basic 2010: ReloadedFourth Edition Chapter One An Introduction to Visual Basic 2010

  2. Objectives After studying this chapter, you should be able to: • Create a Visual Basic 2010 Windows-based application • Manage the windows in the Integrated Development Environment (IDE) • Set the properties of an object • Add a control to a form • Use the Label, Button, and PictureBox tools • Use the options on the Format menu Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  3. Objectives (cont'd.) • Enter code in the Code Editor window • Save a solution • Start and end an application • Print an application’s code and interface • Write an assignment statement • Print an application’s code and interface • Close and open an existing solution • Find and correct a syntax error Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  4. Visual Studio 2010 • Visual Basic 2010 is an object-oriented programming language • Object:anything that can be seen, touched, or used • Class: a pattern used to create an object • Instance: an object created from a class; object is said to be instantiated • Integrated Development Environment (IDE): • Contains all the tools and features needed to create, run, and test programs • Includes Visual Basic, Visual C++, Visual C#, and Visual F# Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  5. Visual Studio 2010 (cont'd.) • Application: program or suite of programs • Windows-based application: • Has a Windows user interface • Runs on a personal computer • User interface: what the user sees and interacts with when using an application • Web-based application: • Has a Web user interface • Runs on a server • Accessed with a computer browser Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  6. Creating a Visual Basic 2010 Windows Application • Windows applications consist of solutions, projects, and files • Solution: a container that stores projects and files for an entire application • Project: a container that stores files associated with a specific portion of the solution • A solution may contain one or more projects Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  7. Solutions, Projects, and Files (cont'd.) Figure 1-1: Illustration of a solution, project, and file Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  8. Starting Microsoft Visual Studio 2010 Figure 1-2: How to start Visual Studio 2010 or Visual Basic 2010 Express Edition Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  9. Figure 1-3: Visual Studio 2010 Professional startup screen Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  10. Figure 1-4: Visual Basic 2010 Express startup screen Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  11. How to Create a Visual Basic 2010 Windows Application Figure 1-5: How to create a Visual Basic 2010 Windows application Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  12. How to Create a Visual Basic 2010 Windows Application (cont’d.) Figure 1-5: How to create a Visual Basic 2010 Windows application (cont’d.) Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  13. How to Create a Visual Basic 2010 Windows Application (cont’d.) Figure 1-6: Options dialog box Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  14. How to Create a Visual Basic 2010 Windows Application (cont’d.) Figure 1-7: Completed New Project dialog box in Visual Studio 2010 Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  15. How to Create a Visual Basic 2010 Windows Application (cont’d.) Figure 1-8: Completed New Project dialog box in Visual Basic 2010 Express Edition Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  16. How to Create a Visual Basic 2010 Windows Application (cont’d.) Figure 1-9: Solution and Visual Basic Project Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  17. Managing the Windows in the IDE Figure 1-10: How to manage the windows in the IDE Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  18. The Windows Form Designer Window • Windows Form Designer window: • Allows you to create (design) the GUI • Graphical user interface (GUI): • What the user sees and interacts with • Windows Form object (or form): • Foundation for the user interface • Add other objects such as buttons/text boxes to form • Title bar with caption and Minimize, Maximize, and Close buttons • Tab at top of designer window has Form1.vb [Design] Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  19. The Windows Form Designer Window (cont’d.) Figure 1-11: Windows Form Designer window Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  20. The Solution Explorer Window • Solution Explorer window: • Displays a list of projects contained in this solution • Displays the items contained in each project Figure 1-12: Solution Explorer window Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  21. The Solution Explorer Window (cont'd.) • Source file: a file containing program instructions • Code: program instructions • Form file: a file containing code associated with a Windows form • Give each form file a meaningful name using the Properties window Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  22. The Properties Window • Properties: a set of attributes that determine an object’s appearance and behavior • Properties window: displays properties of selected object • Default property values are assigned when an object is created Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  23. The Properties Window (cont'd.) Figure 1-13: Properties window showing the Form1.vb file’s properties Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  24. The Properties Window (cont'd.) • Properties window includes an Object box and a Properties list • Object box: • Located immediately below Properties window title bar • Contains the name of the selected object • Properties list: • Left column displays names of properties • Use the Alphabetical or Categorized buttons to sort the display of properties • Settings box: Right column containing the current value of each property Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  25. Properties of a Windows Form Figure 1-14: Properties window showing a partial listing of the form’s properties Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  26. Properties of a Windows Form (cont'd.) • Class definition: block of code that defines the attributes and behaviors of an object • All class definitions are contained in namespaces • Namespace: defines a group of related classes • Dot member access operator: the period that separates words in an object’s name to indicate a hierarchy of namespaces • Name property: used to refer to an object in code • Give each object a meaningful name Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  27. Properties of a Windows Form (cont'd.) • Pascal case: • First letter of each word in the name is uppercase • First part of name is object’s purpose • Second part of name is object’s class • Textproperty: controls the caption displayed on form’s title bar • StartPositionproperty: determines the form’s position on the screen when application starts • Font: general shape of characters in text • Recommended font is Seqoe UI font • Point: a measure of font sizes; one point = 1/72 inch Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  28. The Toolbox Window • Toolbox: • Contains objects that can be added to other objects, such as a form • Each tool has an icon and a name to identify it • Each tool represents a class from which objects, called controls, can be created • Controls: • Objects displayed on a form • Represented as icons in the toolbox • Controls on a form can be selected, sized, moved, deleted, locked in place on the form and unlocked Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  29. Figure 1-15: Toolbox window Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  30. The Toolbox Window (cont'd.) Figure 1-16: How to add a control to a form Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  31. The Toolbox Window (cont'd.) Figure 1-17: How to manipulate the controls on a form Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  32. The Label Control • Label control: • Displays text that user cannot edit • Used as “prompts” to explain controls or display output • Name should end with “Label” • Control names use camel case • Camel case: lowercase first word; uppercase first letter of each subsequent word in the name • Not necessary to assign meaningful names for labels used as prompts because they are never used in code • Labels used for output should have meaningful names Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  33. The Label Control (cont'd.) Figure 1-18: Wizard application’s user interface Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  34. The Button Control • Button control: • Performs an immediate action when clicked • Its name should end with “Button” • Text property: specifies the text that appears on the button’s face Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  35. The Picture Box Control • Picture box control: used to display an image on a form • Image property: specifies the image to display • SizeMode property: handles how the image will be displayed • Settings: Normal, StretchImage, AutoSize, CenterImage, or Zoom Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  36. Using the Format Menu • Format menu: provides options for manipulating controls on the form • Align option: aligns two or more controls by left, right, top, or bottom borders • Make Same Size option: makes width and/or height of two or more controls the same • Center in Form option: centers controls horizontally or vertically on the form • Multi-select controls by clicking the first, then using Ctrl-click for each additional control • First control selected is the reference control • Its size/position is used to adjust the others Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  37. The Code Editor Window • Events: user actions while program is running • Examples: clicking, double-clicking, scrolling • Event procedure: set of instructions to be processed when an event occurs • Tells the object how to respond to an event • Code editor window: used to enter event procedure’s code Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  38. The Code Editor Window (cont'd.) Figure 1-19: How to open the Code Editor window Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  39. The Code Editor Window (cont'd.) Figure 1-20: Code Editor window Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  40. The Code Editor Window (cont'd.) • Class statement: used to define a class • Begins with Public Class <class name> • Ends with End Class • Class Name list box: lists the names of objects (controls) included in the user interface • Method Name list box: lists the events to which the selected object is capable of responding • When you select a control from the Class Name list box and a method name, a code template for the event appears in the Code Editor window • Syntax: rules of the language Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  41. The Code Editor Window (cont'd.) • Keyword: a word with special meaning in a programming language • Event code template has a procedure header and a procedure footer • Event’s procedure header: • Begins with keywords Private Sub • Procedure name includes object name and event name • Handles clause indicates for which objects’ events this code will execute • Sub procedure: block of code that performs a task Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  42. The Code Editor Window (cont'd.) Figure 1-21: Code template for the exitButton’s Click event procedure Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  43. The Me.Close() Instruction • Me.Close() instruction: closes the current form at run time • If the current form is the only form, the application is terminated • Me keyword: refers to the current form • Method: predefined VB procedure that can be invoked (called) when needed • Sequential processing: each line is executed in sequence • Also called a sequence structure Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  44. The Me.Close() Instruction (cont'd.) Figure 1-22: Me.Close()instruction entered in the Click event procedure Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  45. Saving a Solution • An asterisk appears on the designer and Code Editor tabs if a change was made since the last time the solution was saved Figure 1-23: How to save a solution Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  46. Starting and Ending an Application • Startup form: the form to be displayed when the application starts Figure 1-24: How to specify the startup form Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  47. Starting and Ending an Application (cont'd.) Figure 1-25: Project Designer window Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  48. Starting and Ending an Application (cont'd.) Figure 1-26: How to start an application Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  49. Starting and Ending an Application (cont'd.) Figure 1-27: Result of starting the Wizard Viewer application Microsoft Visual Basic 2010: Reloaded, Fourth Edition

  50. Starting and Ending an Application (cont'd.) • When you start a VB application, the IDE creates an executable file • Executable file: • Can be run outside of Visual Studio 2010 • Has a file extension of .exe • Stored in the project’s bin\Debug folder Microsoft Visual Basic 2010: Reloaded, Fourth Edition