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Questions tagged [.net]

Do NOT use for questions about .NET Core - use [.net-core] instead. The .NET framework is a software framework designed mainly for the Microsoft Windows operating system. It includes an implementation of the Base Class Library, Common Language Runtime (commonly referred to as CLR), Common Type System (commonly referred to as CTS) and Dynamic Language Runtime. It supports many programming languages, including C#, VB.NET, F# and C++/CLI.

The .NET Framework is not specific to any programming language. Programming languages from Microsoft, like , , CLI, and , 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: , (do NOT use the tag for questions about .NET Core).

Getting help

Versions of .NET

Performance

Garbage collector

Free .NET Programming Books (C# / F# / VB / Nemerle / Visual Studio)

Reference Source

API Guide

Database

Database Drivers

  • MySQL Connector - Connector/Net is a fully-managed ADO.NET driver for MySQL
  • Npgsql - .NET data provider for PostgreSQL
  • MongoDB - Official MongoDB C# driver
  • RethinkDb.Driver - A RethinkDB database driver in C# striving for 100% ReQL API compatibility and completeness.
  • ServiceStack Redis - .NET's leading C# Redis client
  • StackExchange Redis - General purpose Redis client from Stack Exchange
  • Cassandra - DataStax .NET driver for Apache Cassandra
  • Couchbase - Official Couchbase .NET client library, based on the Enyim Memcached client
  • Firebird.NET - The .NET Data provider is written in C# and provides a high-performance, native implementation of the Firebird API

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)

Build Tools

  • Prebuild - Generate project files for all Visual Studio versions, including major IDEs 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. It has been a while since it has been updated. It also provides a code generator to create code from already created XLS file (saved as XML). Haven't tested this but looks very promising. The author hasn't updated this in awhile.
  • Excel Reader allows creation/reading of .XLS (Excel) files. No Microsoft Office necessary. It has been awhile since it has been updated.
  • Excel Package allows creation/reading of .XLSX (Excel 2007) files. No Microsoft Office necessary. The 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 https://poi.apache.org/. POI is an open source project which can help you read/write Excel, Word, and PowerPoint files. Latest sources available at GitHub repository

Serialization

  • 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

Chat room

Chat about .NET with other Stack Overflow users

RESTFul Web Services

  • RestSharp - Simple REST and HTTP API Client for .NET

Unclassified

333813 questions
865
votes
10 answers

How do I save a stream to a file in C#?

I have a StreamReader object that I initialized with a stream, now I want to save this stream to disk (the stream may be a .gif or .jpg or .pdf). Existing Code: StreamReader sr = new StreamReader(myOtherObject.InputStream); I need to save this to…
Loadman
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851
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32 answers

How to delete all files and folders in a directory?

Using C#, how can I delete all files and folders from a directory, but still keep the root directory?
JL.
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848
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24 answers

How to read embedded resource text file

How do I read an embedded resource (text file) using StreamReader and return it as a string? My current script uses a Windows form and textbox that allows the user to find and replace text in a text file that is not embedded. private void…
Me.Close
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837
votes
11 answers

Split a string by another string in C#

I've been using the Split() method to split strings, but this only appears to work if you are splitting a string by a character. Is there a way to split a string, with another string being the split by parameter? I've tried converting the splitter…
Brandon
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834
votes
12 answers

LINQ Aggregate algorithm explained

This might sound lame, but I have not been able to find a really good explanation of Aggregate. Good means short, descriptive, comprehensive with a small and clear example.
Alexander Beletsky
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832
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17 answers

How to get the type of T from a member of a generic class or method

Let's say I have a generic member in a class or method, like so: public class Foo { public List Bar { get; set; } public void Baz() { // get type of T } } When I instantiate the class, the T becomes…
Patrick Desjardins
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815
votes
19 answers

How do I display a decimal value to 2 decimal places?

When displaying the value of a decimal currently with .ToString(), it's accurate to like 15 decimal places, and since I'm using it to represent dollars and cents, I only want the output to be 2 decimal places. Do I use a variation of .ToString()…
wows
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807
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31 answers

How can I convert String to Int?

I have a TextBoxD1.Text and I want to convert it to an int to store it in a database. How can I do this?
turki2009
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798
votes
16 answers

Order of items in classes: Fields, Properties, Constructors, Methods

Is there an official C# guideline for the order of items in terms of class structure? Does it go: Public Fields Private Fields Properties Constructors Methods ? I'm curious if there is a hard and fast rule about the order of items? I'm kind of all…
mmcdole
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798
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32 answers

Most Useful Attributes

I know that attributes are extremely useful. There are some predefined ones such as [Browsable(false)] which allows you to hide properties in the properties tab. Here is a good question explaining attributes: What are attributes in .NET? What are…
wusher
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795
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20 answers

In C#, what is the difference between public, private, protected, and having no access modifier?

All my college years I have been using public, and would like to know the difference between public, private, and protected? Also what does static do as opposed to having nothing?
MrM
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795
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30 answers

In C#, should I use string.Empty or String.Empty or "" to intitialize a string?

In C#, I want to initialize a string value with an empty string. How should I do this? What is the right way, and why? string willi = string.Empty; or string willi = String.Empty; or string willi = ""; or what?
Daniel Kreiseder
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770
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11 answers

How to get the list of properties of a class?

How do I get a list of all the properties of a class?
Sukesh
768
votes
14 answers

Using LINQ to remove elements from a List

Say that I have LINQ query such as: var authors = from x in authorsList where x.firstname == "Bob" select x; Given that authorsList is of type List, how can I delete the Author elements from authorsList that are…
TK.
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763
votes
16 answers

Run Command Prompt Commands

Is there any way to run command prompt commands from within a C# application? If so how would I do the following: copy /b Image1.jpg + Archive.rar Image2.jpg This basically embeds an RAR file within JPG image. I was just wondering if there was a…
user
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