The .NET Framework is a software framework for Microsoft Windows operating systems. It includes an implementation of the Base Class Library, Common Language Runtime, and Dynamic Language Runtime. It supports many programming languages, including C#, VB.NET, F# and C++.

The .NET Framework is not specific to any one programming language. The C#, VB.NET, C++/CLI, and F# programming languages from Microsoft, as well as many other languages from other vendors, all use the same .NET Framework.

The .NET Framework includes a large library of functions as part of the Base Class Library (BCL), including those related to user interface design, data access, database connectivity, cryptography, development of web applications, mathematical algorithms, and network communications. This extensive library simplifies development and makes it easy to rapidly develop new applications.

As such, questions like "How do I do file I/O in C#?" should really be "How do I do file I/O with .NET?". Because such a question concerns the file I/O libraries provided by the .NET Framework, it should be tagged with both the tag, and with the tag, to indicate that you'd like the answer to be written in the C# programming language.

See also: Mono.


Useful .NET Libraries

Mathematics

  • Math.NET Numerics - special functions, linear algebra, probability models, random numbers, interpolation, integral transforms and more

Package managers for external libraries

  • NuGet (formerly known as NuPack) - Microsoft (developer-focused package management system for the .NET platform intent on simplifying the process of incorporating third party libraries into a .NET application during development)
  • OpenWrap - Sebastien Lambla - Open Source Dependency Manager for .net applications

Build Tools

  • Prebuild - Generate project files for all VS version, including major IDE's and tools like SharpDevelop, MonoDevelop, NAnt and Autotools

Dependency Injection/Inversion of Control

Logging

Validation

Design by Contract

Compression

Ajax

Data Mapper

ORM

Charting/Graphics

PDF Creators/Generators

Unit Testing/Mocking

Automated Web Testing

Misc Testing/Quality Support/Behavior Driven Development (BDD)

URL Rewriting

Web Debugging

  • Glimpse - Firebug for your webserver

Controls

MS Word/Excel Documents Manipulation

  • DocX to create, read, manipulate formatted word documents. Easy syntax, working nicely, actively developed. No Microsoft Office necessary.
  • Excel XML Writer allows creation of .XLS (Excel) files. No Microsoft Office necessary. Been a while since it has been updated. It also provides code generator to create code from already created XLS file (saved as xml). Haven't tested this but looks very promising. Too bad author is long time gone.
  • Excel Reader allows creation/reading of .XLS (Excel) files. No Microsoft Office necessary. Been a while since it has been updated.
  • Excel Package allows creation/reading of .XLSX (Excel 2007) files. No Microsoft Office necessary. Author is gone so it's out of date.
  • EPPlus is based on Excel Package and allows creation/reading of .XLSX (Excel 2007). It is actually the most advanced even comparing to NPOI.
  • NPOI is the .NET version of POI Java project at http://poi.apache.org/. POI is an open source project which can help you read/write xls, doc, ppt files.

Social Media

  • LinqToTwitter - Linq-based wrapper for all Twitter API functionality in C#
  • Facebook C# SDK - A toolkit for creating facebook applications / integrating websites with Facebook using the new Graph API or the old rest API.

Serialisation

  • sharpserializer - xml/binary serializer for wpf, asp.net and silverlight
  • protobuf-net - .NET implementation of google's cross-platform binary serializer (for all .NET platforms)

Machine learning

  • Encog C# - Neural networks
  • AForge.net - AI, computer vision, genetic algorithms, machine learning

Unclassified