C# documentation

Learn to program in C#

Get Started

• Online, interactive Hello world
• Math and numbers in C#
• Introductory tutorials
• Create C# apps with Visual Studio
• C# on Q&A

video

• What is C#?
• C# 101 video series

Download

• Download the .NET SDK

C# fundamentals

Overview

• A tour of C#
• Structure of a C# program
• Main() and command-line arguments

Concept

• The C# and .NET type system
• Language Integrated Query (LINQ)
• async and await

Tutorial

• Object-oriented inheritance
• Use LINQ to query data
• Format text using string interpolation
• Browse all tutorials

New features in C# 9.0

What's new

• What's new in C# 9.0
• What's new in C# 8.0
• What's new in C# 7

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

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