Ready to mingle with NET?

Ready to mingle with .NET?
 Introduction
• What is .NET?
• What is .NET Framework?
• Features of .NET Framework
• .NET Framework Architecture
• What is Common Language Runtime (CLR)?
• Wh t i C
What is Common Type System (CTS)?
T S t (CTS)?
• Language that we will use‐C#
• But why C#?
But why C#?
• Something more about .NET
• Million Dollar Question: Why should we learn .NET?
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 What is .NET?
What is .NET?
A technology developed by Microsoft for
• Console Applications
• Windows Applications
• Web Based Applications
Web Based Applications
• Windows Services
• Class Libraries
• Control Libraries
• Mobile Applications
• & Many More……
& Many More……

Requires .NET Framework for applications to run
 What is .NET Framework?
What is .NET Framework?
• Next
Next iteration of Microsoft
iteration of Microsoft’ss platform for 
platform for
developing component based applications.
• An environment for running .NET applications.
An environment for running NET applications
• Essentially a system application that runs on 
Wi d
Windows.
 What is .NET Framework?
What is .NET Framework?
Windows Forms
Windows Forms Web Forms
Web Forms Web Services
Web Services

Data and XML Classes
(ADO NET SQL XML )
(ADO.NET, SQL, XML …)

Framework Base Classes
(IO, String, Net, XML, Security, Threading, Text, Reflection, Collection…)
(IO, String, Net, XML, Security, Threading, Text, Reflection, Collection…)

Common Language Runtime
(debug, exceptions, type checking, JIT compilation)

Windows Operating System
 How it works???
How it works???
Source Code 
(
(C#.NET ,Visual Basic.NET etc.)
, )

Compilation Stage 1
Compilation of source code to MIL (Microsoft Intermediate Language)

Compilation Stage 2
C il i S 2
Compilation of MIL to platform specific code by CLR

Application Execution
Application executed by the Windows Operating System
 How it works???
How it works???
• Every
Every program is actually stored as MIL also 
program is actually stored as MIL also
called as Managed Code (We’ll see it shortly).
• The CLR on the target machine finds the type 
The CLR on the target machine finds the type
of  code which the target machine 
understands.
understands
• Converts the MIL to that code and 
voila….The application executes.
 Features of .NET Framework
Features of .NET Framework
• Security
• Garbage Collection
• Platform Independence (Theoretical at the moment)
Platform Independence  (Theoretical at the moment)
• Language Interoperability
• C d A
Code Access Security
S it
• Efficient Error Handling mechanisms
• Memory Management
• and Many More…
 Components of .NET Framework
Components of .NET Framework
• Common Language Runtime (CLR)
Common Language Runtime (CLR)
• Common Type System (CTS)
• C
Common Language Specification (CLS)
S ifi i (C S)
• Framework Class Libraries (FCL)
 Common Language Runtime (CLR)
Common Language Runtime (CLR)
• Runtime
Runtime execution environment for .NET 
execution environment for NET
Applications.
• Provides support for language interoperability.
Provides support for language interoperability
– One program in C#
– One in VB
O i VB
– Compile one to MIL. Use it in other.
• Provides security by allowing to run managed 
code.
 Common Type System
Common Type System
• Provides
Provides common types to all languages
common types to all languages
• Integer in Visual Basic is same as 
i in C# is same as
int i C i
Int32 class.
• Helps to provide Language Interoperability
 Common Language Specification
Common Language Specification
• Set
Set of minimum standards to be followed for 
of minimum standards to be followed for
.NET applications.
• All compilers supporting .NET must have these 
All compilers supporting NET must have these
specifications.
• Such code is called CLS compliant code.
S h d i ll d CLS li d
• A compiler without CLS compliant code is not 
guaranteed to provide interoperability.
 Framework Class Libraries
Framework Class Libraries
• Provide a large number class libraries to be used 
g
for creating applications for windows platform.
• Provides efficient implementations for basic 
operations like input output etc
operations like input output etc.
• Makes application development faster.
• Help developer to concentrate more on business 
Help developer to concentrate more on business
logic
• Examples are
p
» Database Connectivity
» Cryptography
» Network communications etc.
 Languages that .NET Supports
Languages that .NET Supports
• .NET supports around 20 different languages.
NET supports around 20 different languages
• The languages provided by Microsoft Visual 
Studio include C# Visual Basic Visual J#
Studio include C#, Visual Basic, Visual J#, 
Visual C++, J++ etc.
• Other languages are Perl, Delphi etc.
Oh l P l D l hi
• Language we are going to use : C#
 But why C#?
But why C#?
• Easy
Easy to learn
to learn
• Syntax 
70% Java+20% C/C++ + 10% own
0% 20% C/C 0%
• Created by keeping in view .NET
• Supports modern Object Oriented 
g g p
Programming concepts.
 Something more about .NET
Something more about .NET
• .NET Versions
NET Versions
• .NET IDE
 .NET Versions
.NET Versions
• .NET 1.1
NET 1 1
• .NET 2.0 (Currently used in most of the 
applications)
• .NET 3.0 (Introduced WCF, WPF)
• .NET 3.5 (Released recently)
 .NET Integrated Development 
Environment (IDE)
( )
• Microsoft Visual Studio
Microsoft Visual Studio
• Versions
– 2003 (for .NET 1.1)
2003 (f NET 1 1)
– 2005 (for .NET 2.0 and 3.0)
– 2008 (for .NET 3.5)
( )
 But why should we learn .NET?
But why should we learn .NET?
• Easy
Easy to learn platform for developing 
to learn platform for developing
Windows applications.
• Provides support for many different languages 
Provides support for many different languages
unlike Sun Java which supports only Java.
• Provides security by providing support for 
Provides security by providing support for
Common language runtime which runs 
managed code just like JVM.
• Provides support for developing web 
applications with great GUI
 But why should we learn .NET?
But why should we learn .NET?
• Provides support for writing and programming 
pp g p g g
COM components.
• Compiles code using JIT (Just In Time) which 
improves efficiency in program execution
improves efficiency in program execution.
• Generates Microsoft Intermediate Language 
which can then be converted to target machine
which can then be converted to target machine 
language, thus providing platform independency 
(only theoretical at the moment).
• Provides efficient garbage collection mechanism.
P id ffi i b ll i h i
• Its in your syllabus