2. Introduction OF

3. “INTRODUCTION”
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.NET is a major technology change for Microsoft and in the software world. Just like the computer world moved from DOS to Windows, now they are moving to .NET. But don't be surprised if you find anyone saying that "I do not like .NET and I would stick with VB and C++". There are still lot of people who like to use the old cart instead of the
latest car. The simple answer is ‘.Net is a latest technology from Microsoft, on which all other Microsoft technologies will be depending on in future’.

4. History
.NET technology was introduced by Microsoft, to catch the market from the SUN's Java. Few years back, Microsoft had only C++ and VB to compete with Java, but Java was catching the market very fast. With the world depending more and more on the Internet/Web and java related tools becoming the best choice for the web applications, Microsoft seemed to be loosing the battle. Thousands of programmers moved to java from C++ and VB. This was alarming for Microsoft and many of the Microsoft fan's kept on asking "is Microsoft sleeping?". And Microsoft had the answer. On One fine morning, they announced : "We are not sleeping. We have the answer for you. And that answer was “.NET Technology”.
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Microsoft has a wonderful history of starting late but catching up quickly. This is also true in case of .NET too. Microsoft put their best men at work for a secret project called Next Generation Windows Services (NGWS)., under the direct supervision of Mr. Bill Gates. It is a grand FUD (Fear, Uncertainty, Doubt) campaign. Out of that grand FUD campaign emerged the very capable and useful .NET development environment and framework for both the Web and Windows desktop application, it has really outperformed their competitors.
Microsoft announced .NET to the world in June 2000 and released version 1.0 of the .NET framework in January 2002.

6. Microsoft's C++ was powerful But it was too complex
Microsoft's C++ was powerful But it was too complex. It has too many data types and developers had to learn many libraries.
Visual Basic was too easy and many serious programmers hated it just for that reason. Even though Visual basic was very easy to use, it was not very flexible to develop serious applications.
Sun's Java became a very good choice for these reasons. It had the flexibility and power of C++ and at the same time easy enough to catch the attention of VB programmers.
Microsoft recognized these factors and they introduced the .NET considering all these factors. All unwanted complexities are eliminated and a pure object oriented programming model was introduced. This makes programmer's life very easy.
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7. .NET is not an operating system. It is a framework.
What is .NET
.NET is not an operating system. It is a framework.
.NET is not a programming language it support multiple programming languages. It supports many programming languages, including C++, VB.NET, C# etc.
Is a layer between the operating system and the programming language.
.NET provides a common set of class libraries, which can be accessed from any .NET based programming language. There will not be separate set of classes and libraries for each language. If you know any one .NET language, you can write code in that .NET language by using the same .net class libraries!!
In future versions of Windows, .NET will be freely distributed as part of operating system and users will never have to install .NET separately.
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What is .NET
.NET framework comes with a single class library. And that's all programmers need to learn!! Whether they write the code in C# or VB.NET or J#, it doesn't matter, you just use the .NET class library.
There is no classes specific to any language. There is nothing more you can do in a language, which you can't do in any other .NET language. You can write code in C# or VB.NET with the same number of lines of code, same performance and same efficiency, because everyone uses same .NET class library.

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What is .NET
We cannot define .NET as a 'single thing'. It is a new, easy, and extensive programming framework. It is not a programming language, but it supports several programming languages. By default .NET comes with few programming languages including C# (C Sharp), VB.NET, J# and C++. .NET is a common platform for all the supported languages. It gives a common class library, which can be called from any of the supported languages. So, developers need not learn many libraries when they switch to a different language. Only the syntax is different for each language.

10. What is .NET
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When you write code in any language and compile, it will be converted to an 'Intermediate Language' (Microsoft Intermediate Language - MSIL). So, your compiled executable contains the IL and not really executable machine language. When the .NET application runs, the .NET framework in the target computer take care of the execution.
Whether you write code in C# or VB.NET, you are calling methods from the same .NET class libraries. The same .NET framework executes the C# and VB.NET applications. So, there won't be any performance difference based on the language you write code.

11. This is how Microsoft describes it:
“.NET is the Microsoft Web 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 with Web services. .NET-connected solutions enable businesses to integrate their systems more rapidly and in a more agile manner and help them realize the promise of information anytime, anywhere, on any device.”
Definition: The .NET framework can be defined as a controlled environment for developing and running web/windows applications.
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12. .NET architecture? Microsoft .NET Basically consists of
four major components:
Common Language Specification (CLS) – Green in the diagram.
Framework Class Library (FCL) – Red
Common Language Runtime (CLR) – Yellow
.NET Tools – Cream (extreme right)

13. At the base of the diagram in gray is the operating system, which technically can be any window’s platform but typically is Microsoft Windows 2000 or greater.

14. Languages Currently .NET supports the following Languages:
1). VB.NET 2). C++ 3). C# 4). J# The above languages are from Microsoft.
.NET also support many third parties languages
(Microsoft latest news dot.Net support around 40
languages).
VB.NET:
While Differencing between VB and
VB.NET. There is not much in common between
VB and VB.NET other than the name. VB.NET is
a totally new programming language. It just
retains the syntax of old VB. So, if you are a VB
programmer, probably you may like VB.NET than
C# just because of the syntax.
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15. There has already been C, and C++; but
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C#: (c Sharp)
There has already been C, and C++; but
Microsoft recently introduced yet another language
in the same naming tradition: C# (pronounced "C
sharp").
C# is a language designed to be fully
compatible with Microsoft's .NET and by taking
advantage of C and C++ (as well as Java).
C# is designed to be a platform-independent
language in the tradition of Java. It's syntax is
similar to C and C++ syntax, and C# is designed to
be an object-oriented language. There are, for the
most part, minor variations in syntax between C++
and C#.

16. C#, as part of the .NET framework, is
compiled to Microsoft Intermediate Language
(MSIL), which is a language similar to Java's Byte
code. Furthermore, because the other languages
that used the .NET platform (including VB and
C++) compile to MSIL, it is possible for classes to
be inherited across Languages and communicate
with one another.
Whether you write code in VB.NET or C# or in
any other dot .Net supported language, when you
compile, your code will get converted to MSIL
(Microsoft Intermediate language). The MSIL is then
executed by the same .NET framework, whether
you wrote it originally in C# or VB.NET. The MSIL
generated by C# and VB.NET is about 99% same
and performance is exactly that is 100 % same!
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17. Framework or Base Class Library: (FCL/BCL)
The FCL is a collection of over 7000 classes and data types that enable .NET applications to read and write files, access databases, process XML, display a graphical user interface, draw graphics, use Web services etc.
The FCL wraps many classes and data types that can be used by C# and other .NET programming languages.
The framework's class library and the CLR together constitute the .NET Framework.
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18. ASP .NET
ASP.NET is a server side scripting technology that allows you to use a full featured programming language such as C# or VB.NET etc to build web applications easily.
ADO .NET
ADO.NET is an object-oriented set of libraries classes that allows you to interact with data sources.  Commonly, the data source is a database (Microsoft SQL Server, Microsoft Access, Oracle etc), but it could also be a text file, an Excel spreadsheet, or an XML file.
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19. .NET Tools
There are many .NET Framework (Visual Studio, SharpDevelop, Visual Web Developer) tools designed to help developers create, configure, deploy, manage and secure .NET applications and components.
Visual Studio .NET is Microsoft’s tool for developing Windows software. Visual Studio provides an integrated development environment (IDE) for developers to create standalone Windows applications, interactive Web sites, Web applications, and Web services running on any platform that supports .NET.
Ms Visual Studio can be used to develop console and graphical user interface applications along with Windows Forms applications, web sites, web applications, and web services.
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20. Common Language Runtime (CLR)
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Common Language Runtime (CLR)
Programs written for the .NET Framework execute in a software environment that manages the program's runtime requirements. This runtime environment is known as the Common Language Runtime (CLR).
The CLR also provides other important services such as security, memory management, and exception handling.

21. Common Language Runtime (CLR) forms
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Common Language Runtime (CLR) forms
the heart of the .NET framework. All Languages
have runtime and its the responsibility of the
runtime to take care of the code execution of the
program. For example Java has Java Virtual
Machine Similarly .NET has CLR.
Following are the responsibilities of CLR.
√ Garbage Collection (GC) :- CLR automatically manages memory thus eliminating memory leaks. When objects are no longer in use, GC automatically releases those memory thus providing efficient memory management. [GI]

22. √ IL( Intermediate language )
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√ Code Access Security :- Code Access Security grants rights to program depending on the security configuration. Example, the program has rights to edit or create a new file but the security configuration of machine does not allow the program to delete a file.
√ Code Verification :- This ensures proper code execution and type safety while the code runs. It prevents the source code to perform illegal operation such as accessing invalid memory locations etc.
√ IL( Intermediate language )
CLR uses Just-In-Time JIT and compiles the IL code to machine code and then executes. [GI]

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24. CLR, CTS and CLS : Common Language Runtime Common Type System Common
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CLR, CTS and CLS :
Common Language Runtime
Common Type System
Common
( )
Language Specification

25. Common Type System: (CTS)
In order that two language communicate
smoothly CLR has CTS (Common Type
System). Example in VB you have “Integer” and
in C++ you have “Int” these data types are not
compatible so the interfacing between them is
very complicated. In order that two different
languages can communicate. Microsoft
introduced Common Type System. So “Integer”
data type in VB and “Int” data type in C++ will
convert it to System.int32 which is data type of
CTS. The CTS defines/specify all possible
datatypes supported by the CLR that how they
may or may not interact with each other.
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26. Common Language Specification: (CLS)
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Common Language Specification: (CLS)
This is a subset of the CTS which all
.NET languages are expected to support. It was
always a dream of Microsoft to unite all different
languages in to one umbrella and CLS is one
step towards that. “Microsoft has defined CLS
which are nothing but guidelines that
language to follow so that it can communicate
with other .NET languages in a seamless
manner”.

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Common Type System (CTS) describes how types are declared, used and managed in the runtime and facilitates cross-language integration, type safety, and high performance code execution.
Common Language Specification (CLS) is an agreement among language designers and class library designers to use a common subset of basic language features that all languages have to follow.

28. Benefits of .NET What are the benefits of .NET?
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Benefits of .NET
What are the benefits of .NET?
.NET provides the best platform available today for delivering Windows software. NET helps make software better, faster, cheaper, and more secure.
For developers, .NET provides an integrated set of tools for building Web software and services and Windows desktop applications. .NET also supports multiple programming languages.

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For companies, .NET provides a stable, scalable and secure environment for software development. .NET can lower costs by speeding development and connecting systems, increase sales by giving employees access to the tools and information they need, and connect your business to customers, suppliers and partners.
For end-users, .NET results in software that’s more reliable, attractive and secure and works on multiple devices including laptops, Smartphone's and Pocket PCs.

30. General Information Garbage Collection: (GC)
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General Information
Garbage Collection: (GC)
Garbage collection (GC) is a form of
automatic memory management. The garbage
collector or collector attempt to collect garbage
Such as free/unused memory occupied by those objects which are no longer in use by the program.
Console Applications:
Console Applications are light weight programs run inside the command prompt (DOS) window. They are commonly used for test applications.

31. Windows/Desktop Applications are form based standard Windows desktop applications for common day to day tasks. Microsoft word is an example of a Windows application.
Web Applications are programs that used to run inside some web server (e.g., IIS) to fulfill the user requests over the http. A typical example of web application is Hotmail and Google.
Web Services are web applications that provide services to other web applications over the internet. Google search engine’s web service, e.g., allows other applications to delegate the task of searching over the internet to Google web service and use the result produced by it in their own applications.
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Thank You!