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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
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10 answers

Why seal a class?

I'd like to hear what is the motivation behind the bulk of sealed classes in the .Net framework. What is the benefit of sealing a class? I cannot fathom how not allowing inheritance can be useful and most likely not the only one fighting these…
mmiika
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7 answers

Disable JavaScript error in WebBrowser control

I am developing a windows application with a WebBrowser control that navigates to a sharepoint site. My problem is that i am getting JavaScript error. How can i disable the JavaScript error? I don't want them to pop up.
Gaby
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10 answers

C# - code to order by a property using the property name as a string

What's the simplest way to code against a property in C# when I have the property name as a string? For example, I want to allow the user to order some search results by a property of their choice (using LINQ). They will choose the "order by"…
Jeremy
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109
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9 answers

The type or namespace name 'Objects' does not exist in the namespace 'System.Data'

I am using entities, C# and SQL Server to create an n-tier app. I am creating some base classes common to all my DAL components. In this base class, i want to handle the connection state of the ObjectContext base class inherited by entities…
pencilslate
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109
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3 answers

Why static classes cant implement interfaces?

Possible Duplicate: Why Doesn’t C# Allow Static Methods to Implement an Interface? In my application I want to use a Repository that will do the raw data access (TestRepository, SqlRepository, FlatFileRepository etc). Because such a repository…
Boris Callens
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109
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7 answers

How do I get rid of "[some event] never used" compiler warnings in Visual Studio?

For example, I get this compiler warning, The event 'Company.SomeControl.SearchClick' is never used. But I know that it's used because commenting it out throws me like 20 new warnings of XAML pages that are trying to use this event! What gives? Is…
jedmao
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109
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3 answers

Why there are 5 Versions of Timer Classes in .NET?

Why are there five timer classes in the .Net framework, namely the following: System.Timers.Timer System.Threading.Timer System.Windows.Forms.Timer System.Web.UI.Timer System.Windows.Threading.DispatcherTimer Why are there several versions of the…
Mohammed A. Fadil
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108
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7 answers

Read-only list or unmodifiable list in .NET 4.0

From what I can tell, .NET 4.0 still lacks read-only lists. Why does the framework still lack this functionality? Isn't this one of the commonest pieces of functionality for domain-driven design? One of the few advantages Java has over C# is this in…
Chris S
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108
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1 answer

Conditional Validation using Fluent Validation

What I need is a way to conditionally validate fields depending on if other fields are filled in. Ex. I have a dropdown and a date field that are related. If none of the fields are set then the form should pass validation. However, if one of the…
The Sheek Geek
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108
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5 answers

Why is Array.Length an int, and not an uint

Why is Array.Length an int, and not a uint. This bothers me (just a bit) because a length value can never be negative. This also forced me to use an int for a length-property on my own class, because when you specify an int-value, this needs to be…
doekman
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2 answers

How does TransactionScope roll back transactions?

I'm writing an integration test where I will be inserting a number of objects into a database and then checking to make sure whether my method retrieves those objects. My connection to the database is through NHibernate...and my usual method of…
mezoid
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108
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19 answers

The current .NET SDK does not support targeting .NET Core 2.1. Either target .NET Core 2.0 or lower, or use a .NET SDK that supports .NET Core 2.1

have tried upgrading to the professional version of visual studio 2017 v 15.6.0 (Preview 7.0) and installed aspnetcore-runtime-2.1.0-preview1-final-win-x64 and .net core SDK 2.1.4. When I created a new web application I get an error saying "The…
user8559109
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38 answers

EF Core add-migration Build Failed

I have a developer that is getting "Build failed." when running add-migration in a .NET Core EF project, with no explanation of why the build failed. How do you troubleshoot this error? This is what he gets in the Package Manager Console: Additional…
jceddy
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5 answers

How do yield and await implement flow of control in .NET?

As I understand the yield keyword, if used from inside an iterator block, it returns flow of control to the calling code, and when the iterator is called again, it picks up where it left off. Also, await not only waits for the callee, but it returns…
John Wu
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108
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6 answers

GetProperties() to return all properties for an interface inheritance hierarchy

Assuming the following hypothetical inheritance hierarchy: public interface IA { int ID { get; set; } } public interface IB : IA { string Name { get; set; } } Using reflection and making the following call:…
sduplooy
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