1. An Introduction to Visual Basic .NET and Program Design
Chapter 1
An Introduction to Visual Basic .NET and Program Design

2. Introduction A program is a step-by-step series of instructions
Programming is the process of writing these instructions
Programmers, or software developers, design and write programs
An application is a collection of one or more programs designed to complete a specified task
Program development is the process of writing applications

3. What is Microsoft Visual Basic .NET?
VB.NET is a programming environment that allows you to build programs for the Windows operating system or any system that supports Microsoft’s .NET architecture
VB.NET is based on the Visual Basic programming language
Evolved from BASIC (Beginner’s All-purpose Symbolic Instruction Code
The process of writing a program using a programming language is called coding.

5. Programming and Application Development
Machine Cycle – how a computer processes information -- 4 Steps!
Fetch – get line of code
Decode – convert from programming language to machine language (Binary)
Execute – execute the instructions
Store – store the results – repeat cycle

6. Application Types
Windows Applications

7. Application Types
Web Applications

8. Application Types
Console Applications

9. Application Types
Windows Services

10. Application Types
Web Services

11. Application Types
Components

12. The Development Cycle

14. Phase 1 – Analyze Requirements
Verify the requirements are complete
Make the initial determination that it is possible to solve the problem using a program
List input and output data required
Determine whether the input data is available for testing
Ensure that the information provided explains how to convert the input data into output data so that a solution, or algorithm, can be developed

16. Phase 2 – Design Solution
Develop a logical model that illustrates the sequence of steps you will take to solve the problem
Objects are smaller pieces of a program
Object model – illustrates the attributes and methods of an object.
Attributes -- values that determine, for example, the appearance of an object.
Methods -- instructions that the object uses to perform actions or generate outputs.

17. Phase 2 – Design Solution
Object Model

18. Phase 2 – Design Solution
Flowcharts graphically represent the logic used to develop an algorithm
Control structures, included in flowcharts, allow the programmer to specify the code that will execute only if a condition is met
Pseudocode expresses the step-by-step instructions using keywords and depicts logical groupings or structures using indentation

20. Control Structures

21. Pseudocode

22. Storyboard

23. Phase 3 – Validate Design
Validate, or check, the program design
Step through the solution with test data
Compare the program design with the original requirements

24. Phase 4 – Implement Design
Write the code that translates the design into a program
Create the user interface
Create comments, or notes, within the code that explains the purpose of the code
Test the code as it is written
THIS IS WHERE IT GETS FUN! You tried to write a program … does it work? Does it do what you wanted it to do? Is it user-friendly?

25. Phase 4 – Implement Design

26. Phase 5 – Test Solution Test plan Make sure to set boundary values
Test cases
Make sure to set boundary values

27. Phase 6 – Document Solution
Includes the requirements documents, program design documents, user interface documents, and documentation of the code
Code should be archived electronically

28. Object-Oriented Programming and Object-Oriented Design
Data and the code that operates on the data are packaged into a single unit called an object
Object-oriented design
Represents the logical plan of a program as a set of interactions among objects and operations

29. Rapid Application Development

30. Chapter 1 Complete