This document introduces C# as a modern, general-purpose, object-oriented programming language developed by Microsoft. It discusses why C# is useful, its features like automatic garbage collection and integration with Windows, common development environments like Visual Studio, the basic structure of a C# program, and key syntax elements like variables, methods, and data types.

1. Introduction to C#
 C# is a modern, general-purpose, object-oriented programming language .
 developed by Microsoft.
 Why C#?
 It is a modern, general-purpose programming language
 It is object oriented.
 It is easy to learn.
 It produces efficient programs.
 It can be compiled on a variety of computer platforms.
 It is a part of .Net Framework.
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

2. Features of C#
 Boolean Conditions
 Automatic Garbage Collection
 Standard Library
 Integration with Windows
 Simple Multithreading
 Easy-to-use Generics
 Conditional Compilation
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

3. C#-Environment
 .Net Framework
 Windows applications
 Web applications
 Web services
 IDEs
Visual Studio
Visual C# Express
Visual Web Developer
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

4. C#-Program Structure
 Namespace declaration
 One or multiple namespaces
 A class
 Class methods
 Class attributes
 A Main method()
 Statements and Expressions
 Comments (/* I’m a comment */ )
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

5. Important Points
 Case sensitive
 Statements ends with Semicolon(;)
 Execution starts at the main()
 Filename could be different than classname
 File extension .cs
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

6. Compiling and Executing the Program
 Using Visual Studio:
 Run button
 Shortcut F5
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

7. C#-Basic Syntax
 Member Variables
 Variables declared in a class
 Member Methods
 Methods declared in a class
 Instantiating a Class
 Make an object
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

8. Identifier
 An identifier is a name used to identify a class, variable, function, or any other user-defined item.
 Rules:
 Begins with letters followed by digits and underscore
 Not contain space $ special characters
 Not keywords
 E.g int length; int r_length int r22
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

9. C#-Keywords
 Keywords are reserved words predefined to the C# compiler.
 Examples
 Class
 Static
 Abstract
 True
 False
 Bool
 Case
 As
 etc
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022

10. C#-Data Types
 The variables in C#, are categorized into the following types:
 Value types
 Reference types
 Pointer types
Lecturer: Asadullah Eman Email: asademan.aez@gmail.com
2022