ISYS 812Business Software Development

David Chao

Major Types of Software• System software:

– System management software• Operating systems, network management, etc.

– System development software• Programming languages, computer-aided software engineering

(CASE), etc.

• Application software– General purpose software

• Word processing, spreadsheets, database mangement, etc.

– Application-specific software• Business: Transaction processing, business functions –

operational, decision, strategic.

Characteristics of Today’s Business Software

• Bigger and more complex• Cross-functional

– Enterprise Resource Planning

• Inter-Organizational– E-Collaboration

• Global• Client/Server structure

– N-tier

Characteristics of Today’s System Development Software

• Graphical, event-driven programming

• Object-oriented

• Component programming

• Support database/internet application development

• Intelligent development environment

Software Development Process

• It includes all the activities required to translate a user’s needs into a software product.– Requirements– Analysis and design– Implementation– Test– Project management

• The software process defines who is doing what, when, and how.– Analyst, designer, programmer, tester, manager, etc.

Major Objectives of ISYS812

• Learn the current software development technologies:– Graphical user interface, event-driven, object-oriented,

component, database processing, internet and web services, etc.

– .Net framework with VB.Net

• Understand the software development process and management.– UPEDU

Introduction to UPEDU

• Website: www.yoopeedoo.org• Username & password: students, students• Links:

– The Book: slides and readings

– UPEDU• Overview: Case study

• Disciplines

• Roles

• Artifacts

Introduction to VB and .Net

The History of VB• Early 1960s:BASIC-Beginner’s All-Purpose

Symbolic Instruction Code– Teaching– Simple syntax, easy-to-use– Interpreted language – slow

• Microsoft’s long history of commitment to BASIC– In the 1980s: QuickBasic, QBasic (shipped with DOS)– In the early 1990s, VB 1.0

• Visual interface design and creation• Even-driven programming• Easy database access

– 2002: VB .Net• Challenges: Java, Internet application development

Portability Java: Write Once Run Anywhere

Java Source Code

Java Byte Code(Intermediate Code)

Java Byte Code

Java Virtual Machine(JVM)

Executable Code

Microsoft’s .Net

• Language must compliance with Common Language Specification, CLS.

• Compile the language into Microsoft Intermediate Language (MSIL) code.

• The MSIL code is then executed in the Common Language Runtime (CLR), which conceptually is same as the JVM, where it is translated into machine code by a compiler.

.Net Architecture

Common Language Runtime

Base Class Library

Data and XML

ASP.Net Windows Forms

Common Language Specification

VB.Net C# C++

• Common Language Runtime:– Manages execution of compiled .NET program.– Provides .Net basic services, such as memory

management, garbage collection, etc.

• Base Class library: define all the basic data types such as system.object, numeric, date, etc.

• Data and XML: Classes work with database (ADO.NET) and XML document.

• ASP.Net and Forms: Classes that generate user interface.

• CLS: CLS dictates the minimum group of features that a .Net language must have.

.Net Advantages

• It is independence from a specific language. Developers can create a .Net application in any .Net compatible language.– .Net moves most of the functionality from the language

to the .Net Framework. All .Net language can use these classes.

• It can exist on multiple platforms, further extending the portability of .Net programs.

• Facilitate internet application development:– ASP.Net: Web Forms and XML Web services.

• Universal data access: Data can be accessed by any Internet-connected device.

Programming in the .Net Framework

• Programming in the .Net Framework means making use of the classes, objects, and members exposed by the Framework, building your own classes on top of these and manipulating the resulting objects using a .Net language.

• Ex. VB form is derived from System.Windows.Forms.Form class.

XML and .NET

• .NET Framework uses XML for:– Configuration– Cache dataset– Web services– Web form layouts– Etc.

• XML data combined with schema are becoming increasingly important.

XML Example<?xml version="1.0" ?>

<Books>

<Book>

<ISBN>1-34567-04-01</ISBN>

<Authors>

<AuthorName>John Smith</AuthorName>

<AuthorName>Peter Chen</AuthorName>

<AuthorName>David Chao</AuthorName>

</Authors>

<Price> $45.00</Price>

<Description>This is a great book</Description>

</Book>

<Book>

<ISBN>1-34567-04-02</ISBN>

<Authors>Adam Smith</Authors>

<Price> $25.00</Price>

<Description>This is a second great book</Description>

</Book>

</Books>