The document discusses the .NET Framework, including its architecture, components like the Common Language Runtime (CLR) and class libraries, advantages over other technologies like Java, and supported programming languages. The CLR handles tasks like memory management, security, and compilation to native code. Assemblies are fundamental deployment units. The .NET Framework provides a complete environment for developing various application types on Windows and other platforms.

1. .NET Framework
Session 1

2. Objectives
1. .NET Framework architecture.
2. C# vs Java.
3. .NET Framework component.
4. Advantages of .NET Framework .
5. Framework Classes.
6. CLR

3. What is .NET framework
 .NET is a new technology for building modern
application that can be executed in any modern
operating system and modern devices like
PCs,servers,palm-tops etc.
.NET is the Microsoft services strategy to connect
information, people, systems, and devices through
software. Integrated across the Microsoft platform, .NET
technology provides the ability to quickly build, deploy,
manage, and use connected, security-enhanced solutions.

4. The .NET Framework has been designed so that it
can be used from any language, including C# as well
as C++, Visual Basic, JScript, and even older
languages such as COBOL.
(.NET is platform independent. As of now it can work
on Windows and Linux OS because MS has launched
only two JIT(Just In Time) compilers one for each
OS. If MS launches JIT compilers for other OS’s it
will be able to run in them too.)

5. It provides complete environment to developers for
developing
1)Windows application
2)Web application(ASP.NET)
3) Web Services
4)Console application
5)Class libraries

6. The key features of .NET framework are:
A) Base Class Library:- The base class library of .NET
framework contains rich collection of classes that are
available to developer for codes.
B)Common Language Runtime:- It is heart of .NET
framework. .NET framework provides a runtime
environment called the Common Language Runtime
or CLR.(Similar to JVM in Java).
C)Class Loader:-class loader is component of .NET
framework's runtime which loads the classes from
class library as required by MSIL.

7. CLR(Common Language Runtime)
• CLR provides some functionality, such as
a)Memory management
b) exception handling
c)Debugging
d)Security
e)Thread execution
f)Code execution
g)Code safety
h)Code verification
& Compilation

8. Managed & Unmanaged Code
• Managed code is the code that is executed
directly by the CLR.Therefore,the application
that are created using managed code
automatically have CLR services, such as code
access security(CAS) & automatic garbage
collection. The CLR compiles the application to
Intermediate Language(IL) code not machine
code .

9. CLR perform to execute a piece of
Managed Code
• 1)Selecting a language compiler:
Select programming language
• 2)Compiling the code to IL code:
converting source code to IL code, language
independent
• 3)Compiling IL code to native code:
using JIT Compiler
• 4)Executing the code:
Require result

10. The CLR converts CIL to native
code
Source Code
C#.Net
VB.Net
Other .Net
Language
Byte Code Native Code
CIL Code
Native Code
C# Compiler
VB.Net
Compiler
Other
Compiler
JIT

11. Unmanaged Code
Unmanaged code directly compiles to
machine code and runs on the machine where
it has compiled.
It does not have services,such as code access
security(CAS) & memory management which
are provided by the runtime.

12. D) Assemblies: Assemblies are the fundamental units of
deployment, version name, securities permissions etc.
 An assemblies is a .NET executable program or unit
of deployment like EXE or DLL that delivered as a
single unit.
 When you build a C# windows or console
application, the .exe file produced is an assembly.
If you build a class library the DLL file produced is
also an assembly.
 Multiple versions can be deployed side by side in
different folders.
 These different version can be executed at the same
time without interfering with each other.

13. CLR Execution Model
VBSource
code
Compiler
C++C#
CompilerCompiler
Assembly
IL Code
Assembly
IL Code
Assembly
IL Code
Operating System Services
Common Language Runtime
JIT Compiler
Native Code
Managed
code
Unmanaged
Component

14. Life as a Visual Basic 6.0 Programmer
 VB6 is popular due to its ability to build complex
user interfaces, code libraries (e.g., COM servers),
and data access logic with minimal headache.
Down back of VB6
• VB6 is that it is not a fully object-oriented language.
• For example, VB6 does not allow the programmer to
establish classical inheritance.

15. C# Vs JAVA
 C# provides greater expressiveness & writes
performance critical code .
 Operator Overloading is possible in C#, but not in
JAVA.
 JAVA runs on any machine with JVM, whereas C#
on CLR.
 Applets in JAVA, similar to Web Forms/Win Forms
in C#.

16. C# Vs JAVA
 In JAVA, the “lang” package is automatically
imported, whereas in C# you have to explicitly
specify “ Using System”.
 There is no partial class concept in JAVA,but it
is present in C#.

17. .NET Framework component
 A runtime environment, called the "Common
Language Runtime" (CLR) that handles memory
allocation, error trapping, and security features.
 A set of extensive Framework class libraries,
written from the ground up that comprise
practically any functionality .
 Two top-level development, for web applications
(ASP.NET) and regular Windows applications
(Windows Forms).

18. .NET Framework Classes
ByAnilKumar
System.Data
Design
OLEDB
SQLTypes
SQL
System
Globalization
Diagnostics
Configuration
Collections
Resources
Reflection
Net
IO
Threading
Text
ServiceProcess
Security Runtime
InteropServices
Remoting
Serialization
System.Xml
XPath
XSLT Serialization
System.Web
Configuration SessionState
Caching Security
Services
Description
Discovery
Protocols
UI
HtmlControls
WebControls
System.Drawing
Imaging
Drawing2D
Text
Printing
System.Windows.Forms
Form Button
MessageBox ListControl

19. Summary
• .NET Framework.
• .NET Classes.
• Common Language Runtime.