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4101.  Object-Oriented Programming in C#

Rev. 4.0


Microsoft’s .NET is a revolutionary advance in programming technology that greatly simplifies application development and is a good match for the emerging paradigm of Web-based services, as opposed to proprietary applications. Part of this technology is a new language, C#. This new language combines the power of C++ and the ease of development of Visual Basic 6. It bears a striking resemblance to Java and improves on that language. C# has become the dominant language for building new applications on Microsoft platforms.


This thorough and comprehensive course is a practical introduction to programming in C#, utilizing the services provided by .NET. This course emphasizes the C# language. It is current to Visual Studio 2010 and .NET 4.0, which introduces important new features such as dynamic data type, named and optional arguments, and the use of variance in generic interfaces. The new features are covered in a new chapter. A new supplement covers the fundamentals of Language Integrated Query (LINQ), which was introduced with .NET 3.5.


This course is intended to be fully accessible to programmers who do not already have a strong background in object-oriented programming in C-like languages, such as C++ or Java. It is ideal, for example, for Visual Basic 6 or COBOL programmers who desire to learn C#.


An important thrust of the course is to teach C# programming from an object-oriented perspective. It is often difficult for programmers trained originally in a procedural language to start “thinking in objects.” This course introduces object-oriented concepts early, and C# is developed in a way that leverages its object orientation. A case study is used to illustrate creating a complete system using C# and .NET. Besides supporting traditional object-oriented features, such as classes, inheritance, and polymorphism, C# introduces several additional features, such as properties, indexers, delegates, events, and interfaces that make C# a compelling language for developing object-oriented and component-based systems. This course provides thorough coverage of all these features.


C# as a language is elegant and powerful. But to utilize its capabilities fully, you need to have a good understanding of how it works with the .NET Framework. The course explores several important interactions between C# and the .NET Framework, and it includes an introduction to major classes for collections, delegates, and events. It includes a succinct introduction to creating GUI programs using Windows Forms. The course concludes with a chapter covering the new features in C# 4.0.


Numerous programming examples and exercises are provided, including the case study. The student will receive a comprehensive set of materials, including course notes and all the programming examples.


The course includes three electronic supplements, provided as PDF files. They cover Visual Studio 2010, Language Integrated Query, and unsafe code and the C# pointer type.




·         Acquire a working knowledge of C# programming

·         Learn how to implement programs using C# and classes from the .NET Framework

·         Learn how to implement simple GUI programs using Windows Forms

·         Gain a working knowledge of dynamic data type, named and optional arguments, and other new features in C# 4.0.


Course Duration:  5 days.


Prerequisites:  The student should have programming experience in a high-level language.


1.      NET: What You Need To Know

.NET Executables and the CLR

A .NET Testbed for C# Programming

Using Visual Studio 2010


2.      First C# Programs

Hello, World


Variables and Expressions

Using C# as a Calculator

Input/Output in C#

.NET Framework Class Library


3.      Data Types in C#

Data Types

Integer Types

Floating Point Types

Decimal Type

Characters and Strings

Boolean Type


Nullable Types


4.      Operators and Expressions

Operator Cardinality

Arithmetic Operators

Relational Operators

Logical Operators

Bitwise Operators

Assignment Operators


Checked and Unchecked


5.      Control Structures

If Tests




More about Control Flow



6.      Object-Oriented Programming





Object-Oriented Languages



7.      Classes

Classes as Structured Data


Constructors and Initialization

Static Fields and Methods

Constant and Readonly


8.      More about Types

Overview of Types in C#

Value Types

Boxing and Unboxing

Reference Types

Implicitly Typed Variables


9.      Methods, Properties and Operators


Parameter Passing

Method Overloading

Variable-Length Parameter Lists


Auto-Implemented Properties

Operator Overloading


10. Characters and Strings



String Input

String Methods

StringBuilder Class

Programming with Strings


11. Arrays and Indexers



Random Number Generation

Jagged Arrays

Rectangular Arrays

Arrays as Collections

Bank Case Study—Step 1



12. Inheritance

Single Inheritance

Access Control

Method Hiding


Bank Case Study—Step 2


13. Virtual Methods and Polymorphism

Virtual Methods and Dynamic Binding

Method Overriding

Fragile Base Class Problem


Abstract Classes

Sealed Classes

Heterogeneous Collections

Bank Case Study—Step 3


14. Formatting and Conversion


Format Strings

String Formatting Methods

Bank Case Study—Step 4

Type Conversions


15. Exceptions

Exception Fundamentals

Structured Exception Handling

User-Defined Exception Classes

Inner Exceptions

Bank Case Study—Step 5


16. Interfaces

Interface Fundamentals

Programming with Interfaces

Using Interfaces at Runtime

Bank Case Study—Step 6

Resolving Ambiguities


17. .NET Interfaces and Collections


Bank Case Study—Step 7

IEnumerable and IEnumerator

Copy Semantics and ICloneable

Comparing Objects

Generic Types

Type-Safe Collections

Object Initializers

Collection Initializers

Anonymous Types

Bank Case Study—Step 8


18. Delegates and Events


Anonymous Methods

Lambda Expressions



19. Introduction to Windows Forms

Creating Windows Applications Using Visual Studio 2010

Partial Classes

Buttons, Labels and Textboxes

Handling Events

Listbox Controls


20. New Features in C# 4.0

Dynamic Data Type

Named Arguments

Optional Arguments

Automating Office with C# 4.0

Variance in Generic Interfaces


Appendix A.  Learning Resources


Electronic File Supplements


Supplement 1. Using Visual Studio 2010


Overview of Visual Studio 2010

Creating a Console Application

Project Configurations


Multiple-Project Solutions


Supplement 2.  Language Integrated Query (LINQ)


What Is LINQ?

Basic Query Operators





Supplement 3.  Unsafe Code and Pointers in C#


Unsafe Code

C# Pointer Type


System Requirements


Course exercises require Microsoft Visual Studio 2010 and a Windows operating system, XP or more recent. See the appropriate course Setup Guide for details.


A good minimal hardware profile for this course consists of a 2 GHz or better CPU, 512 MB of RAM, and at least 4 GB of free disk space for tools installation and courseware.