microsoft visual basic 2005: reloaded second edition chapter 1 an introduction to visual basic 2005

Microsoft Visual Basic 2005: Reloaded

Second Edition

Chapter 1An Introduction to Visual Basic 2005

Microsoft Visual Basic 2005: Reloaded, Second Edition 5

Programmers

• Programs: instructions given to computers• Programmers: people who write programs• Applications programmers: write and maintain

programs to handle specific tasks• Systems programmers: write and maintain

programs that run the system, such as operating systems, device drivers, utilities


OOP Terminology

• OOP: Object-oriented programming

• OOD: Object-oriented design

• Object: – Represents a real-world entity– Attributes (or properties): describe the object– Methods: behaviors or operations the object can

perform

• Class: blueprint used to create an object

• Instance: an object created from a class


Visual Studio 2005

• Integrated Development Environment (IDE):– Contains all the tools and features needed to create,

run, and test programs– Includes an editor and compiler

• Visual Studio 2005:– IDE used to create Windows or Web-based programs– Includes Visual Basic 2005, Visual C++ 2005, Visual

C# 2005, and Visual J# 2005


Visual Studio 2005 (continued)

• Application: program or suite of programs

• Windows-based application: – Has a Windows user interface – Runs on a desktop 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– Use a computer browser to access it

• Microsoft .NET Framework 2.0: a platform on which you create applications

• .NET languages: the programming languages included in Visual Studio

• .NET applications: applications created with Visual Studio



• .NET Framework class library: – Contains an extensive set of classes for use in .NET

applications– Reduces development time by providing reusable code– Provides consistency among applications


The Common Language Runtime

• .NET language compilers translate program statements into a Microsoft Intermediate Language, also called Intermediate Language (IL)

• Common Language Runtime (CLR):– Manages the execution of IL instructions

• Just-in-time (JIT) compiler: translates IL into machine code

• CLR allows compiled IL to be reused, regardless of which .NET language was used to create it


The Common Language Runtime (continued)


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 part of the solution


Starting Microsoft Visual Studio 2005


Starting Microsoft Visual Studio 2005 (continued)


Creating a Visual Basic 2005 Windows-Based Application



(continued)


Managing the Windows in the IDE


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 when using the application

• Windows Form object (or form):– Adds other objects such as buttons and textboxes to

create the GUI – Instance of the Windows Form class– Automatically instantiated when you create an

application


The Windows Form Designer Window (continued)


The Solution Explorer Window

• Solution Explorer window:– Displays a list of projects contained in this solution– Displays the items contained in each project


The Solution Explorer Window (continued)

• Project Designer window:– Open by right-clicking on project folder– Allows you to set options for the project– Contains 9 tabs with groups of options



• Source file: a file containing program instructions

• Code: program instructions

• Form file: a file containing code associated with a Windows form object


The Properties Window

• Properties window: displays properties of selected object

• Default property values are assigned when an object is created


The Properties Window (continued)


The Properties Window (continued)

• 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– Settings box: Right column containing the current value

of each property


Properties of a Windows Form Object


Properties of a Windows Form Object (continued)

• Class definition: block of code that defines the attributes and behaviors of an object

• Namespace: defines a group of related classes• Dot member access operator: the period that

separates words in an object’s name• Name property: used to refer to an object in code• Hungarian notation: naming convention using a 3 or

more character prefix to represent the object type• Camel casing: lowercase prefix, uppercase first

letter of each word



• Pascal case: – First letter and first letter of each word is uppercase– First part of name is object’s purpose– Second part of name is object’s class

• Text property: controls the caption displayed on form’s title bar

• StartPosition property: determines the form’s position on the screen when application starts

• Splash screen: first image to appear when application starts


The Toolbox Window

• Toolbox: – Contains tools used to create an application– Each tool represents a class from which to instantiate

objects• Controls:

– Objects displayed on a form– Are represented as icons in the toolbox– Can be locked in place on the form – Control names use camel casing


The Toolbox Window (continued)


The Label Tool

• Label tool: represents a label control• Label control:

– Displays text that user cannot edit– Used as “prompts” to explain controls or display output


The Label Tool (continued)


The Button Tool

• Button tool: represents a button control

• Button control:– Performs an immediate action when clicked


The Button Tool (continued)


The Code Editor Window

• Events: user actions while program is running

• Event procedure: set of instructions to be executed when an event occurs

• Code editor: used to enter programming code


The Code Editor Window (continued)



• Keyword: has special meaning in a programming language

• Sub procedure: block of code that performs a task

• Event’s Procedure header: – Begins with keyword Private– Procedure name includes object name and event

name– Handles clause indicates for which objects’ events

this code will execute


The Me.Close Method

• Me.Close method: closes the current form

• Method: predefined VB procedure that can be invoked (called)

• Sequential processing: each line is executed in sequence


The Me.Close Method (continued)


Saving a Solution


Starting and Ending an Application

• Startup form: the form to be displayed when the application starts


Starting and Ending an Application (continued)



• Executable file:– Can be run outside of Visual Studio 2005– Has file extension of .exe


Using an Assignment Statement

• Assignment statement: assigns a value to a variable or property of a control

• Assignment operator: the = symbol


Using an Assignment Statement (continued)


Printing Your Code


Closing the Current Solution

• Closing a solution closes all projects and files in that solution


Closing the Current Solution (continued)


Opening an Existing Solution

• Only one solution can be open at any one time

• If a solution is already open, opening a different one will close the currently open solution


Opening an Existing Solution (continued)

microsoft visual basic 2005: reloaded second edition chapter 1 an introduction to visual basic 2005

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