If you were very careful last time, you might have noticed that this piece of code where it says using
System Semicolon is not visible inside of our application here, even though the template is the same.
Where is this using?
Well, the thing is, it is hidden over here.
So there's this little icon.
If you hover over it and click into it, you will find directives from console app for global using
GCS.
So there's this file here where it says system System.collections.generic and so forth.
So it uses all of these directives which are just libraries.
So libraries of books so to speak.
That's how you could memorize it.
And each of these books contains a bunch of code that in the that explains our program, how it's supposed
to handle these lines of code that we're writing, because that's where, for example, is defined what
this static keyword means, what this void keyword means, what this console does, what this right
line does, all of these things that we are just accessing and using for granted have been developed
by somebody who worked at the Dot.
Net framework slash at the C sharp programming languages.
And they developed this language.
And now we can use all of these methods and classes and basically these code snippets that they have
developed.
We can now use them with whatever they intended those pieces of code to do.
Now we can create our own directives and use them later on.
But that's for a very, very late point of this course.
I just wanted to quickly show you where this line of code is, and you can also see that there are a
few more, these system.io and so forth.
We're not going to use those for quite some time, but you don't have to worry about them.
They're just there and you don't have to add them.
Now, if you were to add this using System Semicolon, you can see that it's grayed out.
That's because this directive is unnecessary.
That's because it's already included inside of this file that is automatically generated for us as well.
All right.
And that's it for this video.
It was just to quickly show you this.
You don't have to worry about it for now.
See you in the next video.