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[MUSIC]

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Hello, I'm Jeremy,
today we'll be learning about NuGet.

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No I don't mean the soft yummy
goodness inside of a Snickers bar,

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NuGet is a package management system for
.NET projects.

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It's one of the most used
Visual Studio extensions.

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It's so popular in fact that it now
comes pre-installed with Visual Studio.

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It's been around since late 2010 and
it was born from a collaboration between

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developers of Microsoft and
folks in the open source community.

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If you wanna earn more about its
history and how it can be called NuGet

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you might want to check out
the teacher's notes of this workshop.

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Let's start by talking about what
a package management system is,

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in order to get a good idea
of what NuGet is capable of.

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Almost all software has dependencies.

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This is code that you probably
didn't write yourself but

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you want to use in your own application.

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In fact, nowadays in order to write
a software application, we only need to

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write a small percentage of the total
code the applications need to run.

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Our code depends on other code that
we probably didn't write ourselves.

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In the case of C#,
this code is typically compiled and

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packaged together as a library.

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.Net libraries are called assemblies.

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But you'll notice that I use the terms,
library and

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assembly interchangeably to
refer to .NET assemblies.

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The libraries our applications
need may already be part of

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the operating system
the application runs on, or

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they may be part of another application
that is already installed on the computer.

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.NET, for example,

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is a piece of software that comes
pre-installed on Windows computers.

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It contains many libraries that
are used by .NET applications.

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.NET in turn, depends on libraries that
are part of the Windows operating system.

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We can get other libraries that we
might want to use our applications,

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by downloading them from the Internet.

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This is where package
management system comes in.

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People and organizations that want
to make their code available for

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others to use can put one or

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more libraries into a package and upload
it to a central repository of packages.

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When we want to use their libraries,

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we only need to go to the central
repository and download them.

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A Package Management System is responsible
for managing all of these packages and

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making it easy for developers to
both upload and download packages.

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We can think of it as an App Store for
code where everything is free.

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Now you may have noticed that there are
many different package management systems

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out there, there's typically a main
one for each programming language.

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So if you're coming to .Net from
another programming language,

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you may already be familiar with one or
more package managers.

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For example, Java has Gradle.

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Ruby has gems, Python has Pip,
JavaScript has NPM and

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Bower, PHP has Composer, and
the list goes on and on.

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The package management system for
.NET is Nuget.

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When I say .NET, I mean any packages that
are meant to run using the .NET framework.

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.NET assemblies can be compiled from C# or

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any .NET programming language
such as J# or Visual Basic.

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NuGet packages typically only
contain the assembly files and

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not the actual source code files.

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Now let's open Visual Studio and
see what NuGet can do.

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For this workshop, you'll want to have
Visual Studio 2015 or later installed.

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If you don't already have it installed,
check the teacher's notes for

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a workshop on how to
install Visual Studio.