Project Areas

 Web based systems

 Websites
 Android based systems (Web based Dash-board)
 Real time based systems (using Arduino, atmega 32,64 or 16 for simulations )

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Department of computer science

Event Driven Programming

Prepared By Haftom B. (M.Sc..)

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Course contents
  Chapter 3: Object-Oriented Fundamentals in VB.NET
Chapter One Introduction
 Language Fundamentals
 Introduction to Software Development  Variables and Data Types
 Control Flow
 Software Development Approaches  Methods and Their Types
 Events
 Rapid Application Development
 Classes and Objects
 Software Development Principles  Inheritance and Overloading Implementation
 Classes versus Components
 Chapter 2: Introduction to .NET
 Chapter 4: Exception Handling
 The .NET Platform and Its Architecture
 Base Class Library  Introducing Exception Handling
 Common Language Runtime
 Structured Exception Handling
 Uses of .NET Platform in Application Development  Implementing Exception Handling
 Introduction to Microsoft Visual Studio 2010
 SDI and MDI Forms
 Controls

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Cont..
 Chapter 6: Database Programming
 Chapter 5: Manipulating Files How to open a Text
 The ADO.NET Architecture
File
 LINQ Architecture
 Read a file line by line in VB .NET
 The .NET Data providers
 Write to a Text File
 Working with the common .NET Data providers

  The Dataset Component

How to Copy, Move and Delete a File


Using the DataGrid View for database access

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Assessment Methods
Mid Semester Examination 30%
Project and presentation 20%
Final Examination 50%

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Reference
Text books and References:

1. An introduction to programming using visual basic 6.0, fourth edition, David I.

Schneider Evjen, B et al, (2008). Professional Visual Basic 2008.

2. Crosspoint Boulevard: Wiley Publishing Inc. Gary Cornell and Jonathan Morrison
(2002).

3. Programming VB.NET: A Guide for Experienced Programmers. USA: APress

Cameron Wakefield, Henk-Evert Sonder and Wei Meng Lee. VB.NET Developers
Guide. USA: Syngress Publishing, Inc

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Chapter One
Introduction

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Chapter Content

 Introduction

 Introduction to Software Development

 Software Development Approaches
 Rapid Application Development
 Software Development Principles

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1.1 Event Driven Programming
 Event-driven programming focuses on events
 Event-driven programming is a paradigm where entities
 (objects, services, and so on) communicate indirectly by
sending messages to one another through an intermediary.
 Event:
 A signal to the program that something has happened.
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Cont..
 It can be triggered either by external user actions, such as

 mouse movements
 button clicks, and keystrokes,
 by the operating system, such as a timer.
 The program can choose to respond to or ignore an event.

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1.2 Introduction to Software Development
 What is software development?
 Software development is the process of
 conceiving, specifying, designing, programming, documenting,
testing, and bug fixing involved in creating and maintaining
applications, frameworks, or other software components.

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Cont..
 Software development is a process that a programmers use to build
computer programs.

 The process, also known as the

 Software Development Life Cycle (SDLC),
 includes several phases that provide a method for building products that
meet technical specifications and user requirements.

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1.2.1 Software Development Process
 The process vary in the detail of what activities they prescribe,
their related artefacts.(b/c there are many approaches)
 However the most common process is
 Analysis
 Design
 Implementation
 Testing
 Deployment

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1.3 Software Development Approaches
 the most commonly used software development approaches are
• Waterfall Approach
• Spiral Approach
• RAD
• Agile
• Incremental
• Etc…

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•Waterfall Approach

• The stages of a project

were carried
out sequentially.
• The entirety of each
stage had to be
completed, formally
documented, discussed,
agreed, and signed off
before the next stage
could begin.
• This has been described
as the waterfall
lifecycle.

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•Spiral Approach

• is a development method that

uses the same steps as the
waterfall method, but also
uses project cycles, each
culminating in a version of the
software (a prototype) that is
formally reviewed to inform the
next cycle.
Determine objectives
Identify and resolve risks
Develop and test
Plan (the next iteration)
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Reading Assignment
 Incremental approach
 Agile Approach
 Extreme programming
 DevOps Methodology
 Joint Application Development Methodology

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1.4 Rapid application development
 is a development model prioritizes rapid prototyping and quick feedback
over long drawn out development and testing cycles.

 With rapid application development, developers can make multiple

iterations and updates to a software rapidly without needing to start a
development schedule from scratch each time.

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Steps in RAD
 Although RAD has changed over the years, these four basic
steps provide some continuity over the years.
1. Define the requirements
2. Prototype -> the actual development takes place.
 Instead of following a strict set of requirements
3. Receive Feedback
 Feedback on what’s good, what’s not, what works, and
what doesn’t
4. Finalize Software

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Cont..
 Advantages of the RAD model
 helps to reduce the risk and required efforts on the part of the software
developer.
 helps the clients to take quick reviews for the project.
 Encourages customer feedback which always provides improvement
scope for any software development project.
 Each phase in RAD delivers the highest priority functionality to the

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Cont..
 Disadvantages RAD model
 Depends on the strong team and individual performances for clearly identifying the
exact requirement of the business.
 This approach demands highly skilled developers and a designer’s team which may not
be possible for every organization.
 This is not applicable for the developer to use in small budget projects as the cost of
modeling and automated code generation is very high.
 Progress and problems accustomed are hard to track as such there is no documentation
to demonstrate what has been done.
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Chapter Two

Introduction to .NET

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Chapter Content

 Chapter 2: Introduction to .NET

 The .NET Platform and Its Architecture
 Common Language Runtime
 Base Class Library
 Uses of .NET Platform in Application Development
 Introduction to Microsoft Visual Studio 2010
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What is .NET Framework?
 .Net Framework is a software development platform developed by Microsoft for building
and running Windows applications.
 The .Net framework consists of developer tools, programming languages, and libraries
to build desktop and web applications.
 It is also used to build websites, web services, and games.
 The .Net framework was meant to create applications, which would run on the Windows
Platform.
 The first version of the .Net framework was released in the year 2002.
 The version was called .Net framework 1.0.
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Cont.…
 .NET Framework Architecture is a programming model for the .Net platform
that provides an execution environment and integration
 Has various programming languages for simple development and deployment
of various Windows and desktop applications.
 It consists of class libraries and reusable components.

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.NET Components
 Common Language Runtime
 CLR is the execution engine that handles running applications.
 It provides services like thread management, garbage collection, type-
safety, exception handling, and more.
 also knows as the runtime.
 CLR’s responsibility is to mange any code written in .NET languages
such as C#, VB.NET, or F#.

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Base Class Library(BCL)
 The Class Library provides a set of APIs and types for common functionality.
 It provides types for strings, dates, numbers, etc.
 The Class Library includes APIs for reading and writing files, connecting to
databases, drawing, and more.
 The .NET Framework includes a set of standard class libraries.
 A class library is a collection of methods and functions that can be used for the
core purpose.

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Characteristics of .NET Frame work

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Uses of .NET Platform in Application Development
 Can be used to develop
 Windows applications (windows forms)
 Web (Asp.net)
 Mobile applications that run .NET
 Ado.net For Data base connectivity

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.NET Programming languages?
 Supports he following Languages
 Visual Basic
 C#
 F#
 Visual C++
 Etc.…

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1.5 Visual Basic programming language
 VB.NET is also known as Visual Basic.NET.
 It stands for Visual Basic .Network Enabled Technologies.
 VB.NET is a simple, multi-paradigm object-oriented
programming language designed to create a wide range of
 Windows,
 Web,
 Mobile applications built on the .NET Framework.
 developed by Microsoft in 2002.

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VB.NET Features
• It is an object-oriented programming language
• This language is used to design user interfaces for window, mobile, and web-
based applications.
• It supports a rapid application development tool kit.
• It is not a case sensitive language like other languages such as C++, java, etc.
• It provides simple events management in .NET application.
• A Window Form enables us to inherit all existing functionality of form that can
be used to create a new form. So, in this way, it reduced the code complexity.

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Advantages of VB.NET
• Your code will be formatted automatically.
• You will use object-oriented constructs to create an
enterprise-class code.
• You can create web applications with modern features
like performance counters, event logs, and file system.
• You can connect your applications to other applications
created in languages that run on the .NET framework.
• You will enjoy features like docking, automatic control
anchoring, and in-place menu editor all good for
developing web applications.

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Disadvantages of VB.NET
• VB.NET cannot handle pointers directly.
• This is a significant disadvantage since pointers are much
necessary for programming.
• Any additional coding will lead to many CPU cycles, requiring
more processing time.
• Your application will become slow.

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Summary:
• VB.NET was developed by Microsoft.
• It is an object-oriented language.
• The language is not case sensitive.
• VB.NET programs run on the .NET framework.
• In VB.NET, the garbage collection process has been automated.
• The language provides windows forms from which you can inherit your own
forms.
• VB.NET allows you to enjoy the drag and drop feature when creating a user
interface.

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Introduction to Microsoft Visual Studio 2010

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39
Pr og r a m in g L anguage
Select Your

Select
you p
ro gram
type
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02/07/2024

Your P
ro ject na
me
Solution explorer

Windows Form

Tool box
• button
• Textbox etc
Properties
Data source DB

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To be continued in Lab…

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Chapter 3:

Object-Oriented Fundamentals in VB.NET

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Contents

1. Language Fundamentals
 Variables and Data Types
 Control Flow
 Methods and Their Types
 Events

2. Classes and Objects

3. Inheritance and Overloading Implementation
4. Classes versus Components
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3.1 Language Fundamentals

3.1.1 Variables and Data Types

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3.1.2 Control Flow

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3.1.3 Methods and Their Types

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3.1.4 Events

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3.2 Classes and Objects

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3.3 Inheritance and Overloading Implementation

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3.4 Classes versus Components

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Chapter 4:

Exception Handling
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Contents
 Introducing Exception Handling
 Structured Exception Handling
 Implementing Exception Handling

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