1. Introduction to Computer CC111
Week 08
Visual Basic 1

2. Intended Learning Objectives
Familiar with the Generation of computer Languages.
High level of languages translation
Familiar with the Visual Basic Environment.
Able to build a simple Visual Basic Application.

3. High Level 4th Generation Programming Language Object and Event Driven
What is Visual Basic?
High Level 4th Generation Programming Language
Object and Event Driven
Visual - Windows Based
Integrated Development Environment (IDE)
With the advent of microcomputers, BASIC was displaced by Microsoft Quick Basic which was capable of handling more professional applications.
The next improvement led to Microsoft’s Visual Basic with it’s pre-programmed objects and visual environment to make programming especially easy for the programmer.

4. What is VB Used For?
BASIC: Beginner's All-purpose Symbolic Instruction Code
Most Popular Programming Language
Stand alone programs
Customized specialized Applications
E- Commerce
Web based shopping forms and inquiries
User friendly Interface to applications

5. Example Order Entry Screen
l l l l l l
Allows user to use a mouse to click on boxes for text entry.
Also enables user to click on buttons to initiate processing steps.
Used by a computer equipment retail outlet to record data regarding customer orders.

6. Generations of Computer Languages
1st - Machine language
2nd - Procedure-oriented languages
FORTRAN for scientists and engineers
COBOL for business applications
C for UNIX operating systems
3rd - Object-oriented languages
4th - Event-driven languages. Example:VB
5th - Natural languages

7. Compiler Vs Interpreter
Higher Languages are translated to Machine Language by:
Interpreter
Translates instructions to machine code line-by-line.
BASIC, Quick Basic, Visual Basic
Compiler
Translates the entire program to machine code before running it.
Fortran, C, C++, Visual Basic is also a compiler
By default, applications created in Visual Basic are compiled as interpreted or p-code executables. At run time, the instructions in the executables are translated or interpreted by a run-time dynamic-link library (DLL). 

8. What are the Objects in VB?
Pre-programmed Code for:
Command Buttons
Labels
Pictures
Text Boxes
Have both data and procedures wrapped together
For example a textbox has data and the ability to be keyed into, be resized and have user copy, cut or paste.
A Toolbox allows the programmer to draw objects.

9. What is the Integrated Development Environment (IDE)?
Project Explorer
(Lists forms)
Form Designer
Window
Properties
Code Editor
Forms Layout
Window

10. Visual Basic Environment
GUI (Graphical User Interface) - forms and windows that the user sees Property - a characteristic or attribute of an object such as color and size Event - a user action such as clicking a button Code Editor window - editor specially designed to help you when writing code

11. Visual Studio 2008 IDE Environment
Toolbox
(Objects)
Form Designer
Window
Properties
The Form Designer Window show the GUI application
The Toolbox is used to drag and drop components to your forms
The Properties window show the value of the properties of each selected component(Object)

12. Visual Basic Environment
Components of the VB design environment (Form view)

13. Visual Basic Environment
Components of the VB design environment (Code view)

14. The Code Editor Window Help window Syntax error in Red
Error message box

15. Properties Window Used to set how a control looks and behaves
Holds its default values

16. Control Toolbox Picture Pointer Text Box Label Command Button
Option/Radio Button
List Box
Vertical Scroll Bar
Drive List Box
File List Box
Line
Data Control
Pointer
Label
Group Frame
Check Box
Combo Box
Horizontal Scroll Bar
Timer
Directory List Box
Shape
Image
OLE

17. Building Your First Application
There are three primary steps in building a Visual Project:
Place (or draw) controls on the form.
Assign properties to the controls.
Write event procedures for the controls.
WelcomeApplication.exe

18. Starting Visual Basic

19. Starting Visual Studio 2008

20. Creating New Project

21. Project initial interface

22. Step1 :Draw your controls

23. Step 2 : Assign Properties

24. Changing the Form Title

25. Changing the Form Title……………

26. Edit Image Properties

27. Browse for an Image

28. Edit the SizeMode property of the PictureBox

29. Edit the Text Property of Label1
The Text Property is changed to “ “

30. Accessing components properties from code
PictureBox1
Button1
Label1
Each Component has a name, you access its property by: componentName.PropertyName

31. Step 3:Writing the Code (Events)
Double click on the Button then write your code

32. Writing the Code (Events)

33. Running the Application