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