C# documentation

Learn how to write any application using the C# programming language on the .NET platform.

Learn to program in C#

Get Started

• Learn C# | Tutorials, courses, videos, and more

video

• C# beginner video series
• C# beginner stream
• C# intermediate video series

Tutorial

• Self-guided tutorials
• In-browser tutorial

Reference

• C# on Q&A
• Languages on .NET tech community forums
• C# on Stack Overflow
• C# on Discord

C# fundamentals

Overview

• A tour of C#
• Inside a C# program
• C# highlights video series

Concept

• Type system
• Object oriented programming
• Functional techniques
• Exceptions
• Coding style

Tutorial

• Display command-line
• Intro to classes
• Object oriented C#
• Converting types
• Pattern matching
• Use LINQ to query data

Key concepts

Overview

• Programming concepts

Quickstart

• Methods
• Properties
• Indexers
• Iterators
• Delegates
• Events

Concept

• Nullable reference types
• Nullable reference migrations
• Resolve nullable warnings
• Language Integrated Query (LINQ)
• Versioning

What's new

What's new

• What's new in C# 11
• What's new in C# 10
• What's new in C# 9.0
• What's new in C# 8.0

Tutorial

• Explore record types
• Explore top level statements
• Explore new patterns
• Safely update interfaces
• Create mixins with interfaces
• Explore indexes and ranges
• Nullable reference types
• Explore async streams
• Write a custom string interpolation handler

Reference

• Breaking changes in the C# compiler
• Version compatibility

C# language reference

Reference

• Language reference
• C# keywords
• C# operators
• Configure language version
• C# language specification

Stay in touch

Reference

• .NET developer community
• YouTube
• Twitter