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                           .NET PLATFORM 







n    What is .Net?


n    Why we need .Net?


n    What are the advantages?


n    Features of .Net


n    What can we do with the .Net?


n    Job Opportunities


What is .Net?


n    A new framework, re-invented with a new strategy - Operating System - neutral


n    A new development platform to build integrated, service-oriented applications regardless of platforms and languages


n    Easier for programmers to quickly create robust internet applications


n    Assures Information available any time, any place, on any device


n    Represents a set of components, an environment, a programming infrastructure.




Why we need .Net?


n    Makes Programming Easier


n    To build reusable Web Services instead of solid applications


n    Web Services can be written in any Language, VB, VC++,C#


n    Web Services works with all devices from PCs to hand-helds


n    Easy to add new interface technologies like speech and handwriting recognition




What are the advantages?


n    User can interact with their data through hand-writing, speech, and vision technologies


n    .Net will change the way that applications can be developed as it sets XML as industry standard


n    Extends the ideas of both the Internet and Operating System by making Internet itself as a basis of new OS


n    It promises to handle all existing deficiencies such as, limited interaction between users and computers, barrier to productivity and asynchronous data design across devices etc.




Figure : The .NET Framework consists of the common language runtime and a hierarchical set of


class libraries for building Windows-based, Web, and XML Web service solutions.




Features of .NET




n    Common Language Specification (CLS)


n    Common Type Specification (CLS)


n    Common Language Runtime (CLR)


n    Intermediate Language (IL Code) and Metadata


n    Inter-operability between Languages


n    Base Class Libraries




Common Language Specification (CLS)




n    A .Net language must provide a set of possibilities and constructions listed in an agreement called CLS


n    A .Net Language compiles to a common format specified in the CLS, that CLR understands






Common Type Specification (CTS)




n    A specification of the minimum norms for languages to be .Net compatible


n    It includes a set of basic data types that different languages can follow during runtime


n    It specifies how these data types can interact with each other




 Common Language Runtime (CLR)




n    A runtime is a component that a computer has, to execute programs written in any language


n    CLR manages the execution of code and enables communication between components and objects written in any language




 Intermediate Language Code (IL Code)




n    A source program, on compilation produces a IL code, not a managed executable code (native code).


n    IL code becomes the input to the runtime for execution


n    Just-in-Time (JIT) compiler is required to turn the IL code into native code


n    IL code is CPU independent




Meta Data




n    Metadata is defined as “data about data” - data about system level attributes


n    Compiler generates metadata along with the IL code


n    Metadata usually provides information about the code,


n    such as, the definition of each type and the signatures of members of each type


Inter-operability between languages




n    .Net supports a variety of languages like C#, VB.net, VC++.net.


n    Perl, Eiffel, COBOL are also coming up with their compilers for the .Net platform


n    The code written in any of the CTS compliant languages can be used from any other language on the .Net


n    .Net enables applications and components to be shared and used by developers who program in other languages


Base Class Library


n    String handling


n    Arrays, lists, maps etc.


n    Accessing files and file system


n    Accessing the registry


n    Security and Windows messages


n    Networking


n    Directory and Database Access




What can we do with .Net?


Developing applications using .Net




To develop windows client application, programmable web pages and inter-operable web applications, .Net provides the following:




n    Windows Forms


n    Web Forms


n    Web Services




Windows Forms




It is a framework for building Windows client applications that utilize Common Language Runtime




Web Forms




n    Web forms are developed using ASP.Net to create programmable web pages


n     It also uses CLR language as an additional support


n     Web forms can run on any browser


Web Services




n    Web service is a programmable application logic accessible by all the internet users


n    They are just-like components


n    It uses standard internet protocols like HTTP, SOAP and XML whereas other components uses DCOM, RMI or Internet Inter-ORB (IIOP) protocols






Web Services




n    .Net uses UDDI (Universal Description, Discovery and Integration) protocol to enable applications to find out the availability of services and resources on the internet


n    SOAP is used by .Net to provide information about the services provided by a web service


n    Finally, XML is used to provide a standard for data transfer




Simple Object Access Protocol (SOAP)




n    SOAP is a lightweight and simple XML based protocol that is designed to exchange structured and typed information on the web


n    SOAP can be used in combination with variety of other internet protocols and formats such as HTTP, MIME and SMTP




Extensible Markup Language (XML)




n    XML is used to provide a standard for data transfer


n    Web services depend entirely on XML for interfacing with remote objects


n    It acts as an “entry point” in to so many areas in .Net for future integration




Job Opportunities:




n    .NET is the top ranking software technology when compared with the other technologies like Java.


n    IT magazines like PC Quest, Data Quest, PC World puts .Net on top of the charts for its performance, scalability and versatility.


n    More than 70% of the existing applications are to be upgraded to .Net environment.


n    Corporate giants like Infosys, Wipro, iflex, IBM, Pentasoft, Polaris, Cognizant Technologies have already undergoing development in .Net. And, they still need more.


n    Job Market needs around 25000 .Net skilled engineers during the current year.

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