dotnet.microsoft.com Open in urlscan Pro
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 1. Home
 2. Languages
 3. C#


C#

The modern, innovative, open-source programming language for building all your
apps.

Get started


WHY C#

C# is a modern, innovative, open-source, cross-platform object-oriented
programming language and one of the top 5 programming languages on GitHub.

Do you have experience with JavaScript, Java, or C++? You'll find C# instantly
familiar, and you'll enjoy its evolving features including type safety,
generics, pattern matching, async, records, and more.

We hope you'll fall in love with C# from the very first keystroke.


TRY C#

 * Hello World
 * String Interpolation
 * Language-Integrated Query (LINQ)
 * Pattern Matching
 * Records

C# documentation

Press Alt+F1 for accessibility options.

                Console.WriteLine("Hello World");

var names = new[] { "Ana", "Felipe", "Emillia" };
foreach(var name in names)
{
    Console.WriteLine($"Hello {name}");
}
            

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Console


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                var (name, price, perPackage) = ("pizza dough", 1.99m, 3);

var date = DateTime.UtcNow;

Console.WriteLine(
    $"On {date.ToLongDateString()} at {date.ToShortTimeString()}, \n"+
    $"the price of {name.ToUpper()} \n" +
    $"was {price} per {perPackage} packages.");
            

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Console


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                var names = new[] { "Ana", "Felipe", null, "Emillia" };

names.Where(name => name?.Length > 5)
     .OrderBy(name => name)
     .ToList()
     .ForEach(Console.WriteLine);
            

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Console



public static double ComputeArea(object shape)
    => shape switch
    {
        Square s => s.Side * s.Side,
        Circle c => c.Radius * c.Radius * Math.PI,
        Rectangle r => r.Height * r.Length,

        _ => throw new ArgumentException(
                message: "Unrecognizable shape",
                paramName: nameof(shape))
    };



Person person = new("Nancy", "Davolio");

Console.WriteLine(person);
// Output: Person { FirstName = Nancy, LastName = Davolio }

public record Person(string FirstName, string LastName);










PRODUCTIVE DEVELOPER ENVIRONMENT

Build your apps faster with world-class developer tools that help you write
precise, accurate, and maintainable code the first time.

Use a wide variety of tools that fit your development style available on every
platform including Visual Studio Code (an advanced code editor), Visual Studio
(a powerful IDE), command-line tools, and other popular tools.

Learn about tools for C#


LOVED BY DEVELOPERS, TRUSTED BY ENTERPRISE

C# is one of the top 5 languages used by projects on GitHub and is consistently
one of the most loved languages on Stack Overflow's developer survey.

Hundreds of thousands of companies worldwide use C# to power their business
across a vast array of industries including media, finance, healthcare, gaming,
and more.

Explore customer stories


AN OPEN, VIBRANT COMMUNITY

Become part of our community of over 5 million developers for you to get support
and learn from on Stack Overflow, Microsoft Q&A, .NET Live TV, YouTube, and
more.

C# is open source on GitHub. Get involved and join the developers and companies
already contributing to it.

Join the .NET community


BUILD ANYTHING WITH C#

C# is the most popular language for .NET development. With .NET you can target
any application type running on any platform. Reuse your skills, code, and
favorite libraries across all of them in a familiar environment. That means you
can build apps faster, with less cost.

From mobile applications running on iOS and Android, to enterprise server
applications running on Windows Server and Linux, or high-scale microservices
running in the cloud, .NET provides a solution for you.

Learn about the .NET platform


LEARN C# WITH DEVELOPERS

Explore the concepts and syntax of the C# programming language with live coding
demos in our C# for Beginners video series.

Once you learn the basics, explore other lessons at the .NET videos page where
you can learn to build any type of app with C#.

Browse all lessons



Data sourced from official tests available at TechEmpower Round 21.


PERFORMANCE WHERE IT MATTERS

.NET is fast. Really fast! That means applications provide better response times
and require less compute power.

The popular TechEmpower benchmark compares web application frameworks with tasks
like JSON serialization, database access, and server side template rendering -
.NET performs faster than any other popular framework.


MADE IT THIS FAR, BUT NOT READY TO INSTALL?

Our in-browser tutorial will get you started learning C# today. No install
needed.

Get started

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