This document provides an introduction and overview of C# and the .NET framework. It discusses key concepts like MSIL, CLR, CLS, and CTS. It explains that C# code is compiled to MSIL, which is executed by the CLR and JIT compiler to produce native code. The .NET FCL provides reusable code through namespaces and is object-oriented. Memory management and garbage collection are handled by the CLR.

1. Welcome to
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2. Introduction
C#
By
Vignesh Nethaji

3. C# Overview And Environment
• .Net Framework
• MSIL(Microsoft Intermediate Language)
• CLR(Common Language Runtime)
• CLS(Common Language Specification)
• CTS (Common Type System)

4. .Net Framework Overview
• Managed Code
• Two Components Of Framework
FCL(Framework Class Library)
CLR(Common Language Runtime)

5. .Net FCL(Framework Class Library)
• Provides the core functionality.
• Collection of reusable codes.
• Object oriented and easy to use in program developments.
• Third-party components can integrate .
• Hierarchical tree structure and it is divided into Namespaces.
• Namespaces
Namespaces are logical grouping of types
System Namespace is the root for types in the .NET Framework

6. Common Language Runtime
Overview
• Execution Environment between OS and Applications
• Managed Code into native code
• Just in Time(JIT)Compiler
MSIL to native code on demand at application run time.

7. Common Language Runtime
Execution Time
• Thread executions
Run based on schedule
• Memory Management
Allocation of Objects and Buffers
• Garbage Collection(GC)
Clean up the unused Objects and buffers
• Exception Handling

8. Source
code
C#

9. Source
code
Compiler
C#

10. Source
code
Managed
Code or MSIL
Assembly IL
Code
Compiler
C#

11. Source
code
Common Language Runtime
Managed
Code or MSIL
Assembly IL
Code
Compiler
C#

12. Source
code
Common Language Runtime
Managed
Code or MSIL
JIT Compiler
Assembly IL
Code
Compiler
C#

13. Source
code
Common Language Runtime
Native Code
Managed
Code or MSIL
JIT Compiler
Assembly IL
Code
Compiler
C#

14. Source
code
Operating System
Common Language Runtime
Native Code
Managed
Code or MSIL
JIT Compiler
Assembly IL
Code
Compiler
C#

15. Common Type System(CTS)
• Describes the datatypes in .Net Language
• Datatypes are two types
1.Value Types
int
Enum
Struct
2.Reference Type
Classes
Interfaces
Arrays

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