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What is .NET ?
NET is a collection of tools, technologies, and languages that all work together in a framework to provide the solutions that are needed to easily build and deploy truly robust enterprise applications.
These .NET applications are also able to easily communicate with one another and provide information and application logic, regardless of platforms and languages.
The .NET Framework has two main components: the common language runtime (CLR) and the .NET Framework class library or called as a Base Class Library (BCL).
Why this .NET Framework came into existence ?
To provide a consistent object-oriented programming environment whether object code is stored and executed locally, executed locally but Internet-distributed, or executed remotely.
To provide a code-execution environment that minimizes software deployment and versioning conflicts.
To provide a code-execution environment that promotes safe execution of code, including code created by an unknown or semi-trusted third party.
To provide a code-execution environment that eliminates the performance problems of scripted or interpreted environments.
Two main component of .NET Framework
Common Language Runtime
The Common Language Runtime is basis for all of .NET All .NET code runs on the CLR.
The CLR allows developers to choose between multiple languages to create application.
Language Independence
The .NET Framework introduces a Common Type System, or CTS. The CTS specification defines all possible data types and programming constructs supported by the CLR and how they may or may not interact with each other conforming to the Common Language Infrastructure (CLI) specification. Because of this feature, the .NET Framework supports the exchange of types and object instances between libraries and applications written using any conforming .NET language.
Code that is compiled and targeted to the CLR is known as managed code.
Managed code provides metadata that is needed for the CLR to provide the services of Multilanguage support, code security, object lifetime management, and memory management.
After using one of the language compilers, your code is compiled down to Microsoft Intermediate Language.
Microsoft Intermediate Language, known as MSIL or simply IL, is a CPU-independent set of instructions that can be easily converted to native code. The metadata is also contained within the IL.
After IL, the code that you started with will be compiled down even further by the JIT compiler to machine code or native code.
The IL contains everything that is needed to do this, such as the instructions to load and call methods and a number of other operations.
JIT compilation
The .NET Framework contains one or more JIT compilers that compile your IL code down to machine code, or code that is CPU-specific. This is done when the application is executed for the first time.
Base Class Library
The Base Class Libraries (BCL) are a set of classes, value types, and interfaces that give you access to specific developer utilities and various system functions.
All the languages that sit on top of the .NET Framework have equal access to all the classes that are contained within the BCL.
That is it is a collection of reusable types that tightly integrate with the common language runtime
VB
Imports System.Data
Imports System.Data.OleDb
C#
using System.Data;
using System.Data.OleDb;
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