C#

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C# is a modern, object-oriented language with lots of great features, such as type-inference and async/await. The tooling is excellent, and there is extensive, well-written documentation.

12 Mentors

Our mentors are friendly, experienced C# developers who will help teach you new techniques and tricks.

2,956 Students

Join thousands of students who have enjoyed learning and improving their skills by taking this track.

118 Exercises

Hundreds of hours have gone into making these exercises fun, useful, and challenging to help you enjoy learning.

About C#

C# is a multi-paradigm, statically-typed programming language with object-oriented, declarative, functional, generic, lazy, integrated querying features and type inference.

Statically-typed means that identifiers have a type set at compile time--like those in Java, C++ or Haskell--instead of holding data of any type like those in Python, Ruby or JavaScript.

Object-oriented means that C# provides imperative class-based objects with features such as single inheritance, interfaces and encapsulation.

Declarative means programming what is to be done, as opposed to how it is done (a.k.a imperative programming) (which is an implementation detail which can distract from the domain or business logic).

Functional means that functions are first-class data types that can be passed as arguments to and returned from other functions.

Generic means that algorithms are written in terms of types to-be-specified-later that are then instantiated, when needed, for the specific types provided as parameters.

Lazy (a.k.a "deferred execution") means that the compiler will put off evaluating an item until required. This lets one safely do weird stuff like operating on an infinite list--the language will only create the list up to the last value needed.

Integrated Querying means the language feature called LINQ "Language-Integrated Query", which enables lazy querying directly within the language, not only its own objects but, also, external data sources through formats such as XML, JSON, SQL, NoSQL DBs and event streams.

Type inference means that the compiler will often figure out the type of an identifier by itself so you don't have to specify it. Scala and F# both do this.

Syntax is similar to that of other C-style languages such as C, C++ and Java.

.NET is the managed environment within which C# runs, so you get access to the entire .NET ecosystem, including all packages on nuget.org. .NET used to be Windows-only but, with the release of .NET Core -- as well as Mono -- you can also use C# on Mac, Linux or Unix-based systems and on mobile platforms too.

C# also has features, amongst others, to make programming with multiple threads/processors, parallelisation, asynchrony, unmanaged code in a managed environment and language interoperability easier. It is developed and maintained by Microsoft, who provides the official documentation.

Join the C# track
class HelloWorld
{
    string Hello()
    {
        return "Hello, World!";
    }
}

The c# markdown problem is my favourite

The c# markdown problem is my favourite, it is sufficiently complex to be interesting, and is similar to a lot of the code that I see. Writing good quality code from scratch is generally easier than refactoring existing bad quality code to make it good.

Relaxed. Encouraging. Supportive.

Meet the C# Track Mentors

Once you join the C# language track, you will receive support and feedback from our team of mentors. Here are the bios of a few of the mentors of this track.

Tushar Tyagi https://github.com/tushartyagi

I like C# because it's elegent without being verbose, and becomes better with each version. I've been using it professionally for some time now and feel pretty happy with it.

Christoph Lipp https://github.com/ser1us

I use C# for all my IoT projects and my native apps (Xamarin). It has a very big ecosystem and frameworks like ASP.NET Core can be used as a very good alternative to Node.js.

Paul Moore https://github.com/pdmoore

C# is one of the most used languages at client sites I work with. I'm glad I can share my knowledge with you as you pick up this valuable tool.

Mariusz Bojkowski C# Today blog

I’m C# / .NET software developer and architect. My commercial adventure with software started in 2006 but it was my PASSION even before that.

Erik Schierboom My blog

I am a developer with a passion for learning new languages. C# is a well-designed and expressive language that I love programming in.

Tushar Koshti My Blog

I love C# for its simplicity and consistency. I use C# in building Mobile apps through Xamarin, building Web and Desktop applications.
Fun. Challenging. Interesting

Community-sourced C# Exercises

These are a few of the 114 exercises on the C# track. You can see all the exercises here.

Tournament
medium
medium
parsing
strings
Book Store
medium
medium
recursion
Pascals Triangle
medium
medium
arrays
control flow loops
mathematics
Space Age
medium
easy
floating point numbers
Pythagorean Triplet
medium
medium
integers
mathematics
overloading
Robot Name
medium
easy
classes
randomness
strings

Get started with the C# track. As with everything on Exercism, it's 100% free!

Join the C# Track