What is .Net Framework?



The Microsoft .Net Framework is a platform that provides tools and technologies for develop powerful Web Applications, Windows Application.

The main two components of .Net Framework are:

  • CLR – Common Language Runtime
  • BCL – Base Class Library OR .net Framework Class Library (FCL)

.Net Framework Diagram

.Net Framework diagram

.Net Framework diagram


CLR – Common Language Runtime

  • CLR is the Foundation of the .NET Framework.
  • CLR is the Heart of the .NET Framework.
  • The Common Language Runtime (CLR) is an Execution Environment.
  • The main function of Common Language Runtime (CLR) is to convert the Managed Code into Native code and then execute the Program.
  • The Common Language Runtime (CLR) uses Just In Time (JIT) compiler to converts Intermediate Language (MSIL) to Native code/ Machine code.

Functionality of CLR

  • Memory management
  • Thread management
  • Security management
  • Garbage Collection (GC)
  • Runs the code on different platform

FCL – .Net Framework Class Library

FCL or BCL provide the fundamental building blocks for any application you develop, Web application or Windows application.
The .NET framework provides a set of base class libraries which provide functions and features which can be used with any programming language which implements .NET, such as Visual Basic, C# (or course), Visual C++, etc.

Framework Class Library Namespace

  • System.Data – Is the namespace for ADO.NET
  • System.IO – Provides connection to file system and the reading and writing data.
  • System.Net – Provides access to network protocols such as SSL, HTTP, SMTP and FTP
  • System.Text – Provides the String Builder class, String Function
  • System.Drawing – Provide graphics support

Next, We will learn about different .Net Framework versions.

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