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How to organize C# code in different files without GUI?

I'm beginner to C# and have to develop some C# code under linux.
Until now, I could work it all out in a single file, just by using the two commands mcs and mono, without any GUI. And if possible, I'd like to avoid the GUI.
But now I want to seperate code in different files or even folders, but I could not find any explanation online.
Let's say I have some code like this
public class SpecialVector
{
// some code
}
in some special.cs file. How can I use SpecialVector in some other file, let's say normal.cs? (Btw how do you call code grouped in a file in C#?)
Excuse me if this question has already been asked, but I don't know how to twist it so that the search engine understands my problem...

As has been mentioned in the comments, if you aren't limited to Mono for a particular reason, you are highly encouraged to switch to .NET Core (now called .NET as of version 5). It has native support for both Windows, Mac and Linux, and comes with command line tools that allow you to create and build entire multi-file projects in a single command, without having to specify each individual file manually.
That being said, if you continue using Mono, you can specify multiple files to the compiler in the following manner:
mcs File1.cs File2.cs
(and so on)
Have a look at the man page for mcs for more info.

Is there a good way of extracting data from GUI on Windows OS using python libraries?

I'm currently working on a project which requires me to extract data from GUI on Windows OS - say I need to extract content such as the URL in my browser or the name of the attachment on Gmail.
I have already tried LDTP/Cobra, however it's pretty slow - each request can take up to 5 seconds and I need this library to be reasonably fast. Besides that, the LDTP/Cobra is pretty outdated and the latest MSI file doesn't work with python 3.* unless you modify the library itself.
I've been also researching the pywin API, however, it seems that you can't really extract anything with FindWindowEx and WM_GETTEXT method anymore, but I might be wrong.
My question is - is there any other library that would allow me to extract basically anything from a given Window? Maybe I'm missing an important part of the mentioned libraries? Ideally, I'm looking for a python library, but if there is no other way I could try and write some C# code.

Can PHP Extensions be written using C#

Is it possible to create a PHP Extension using C#?
We have a need to connect PHP to in house libraries we have written in C#.NET 4.6 targeting Windows and would like to be as close as possible to PHP without needing to have a serivce we can call external to php, thus the idea of making an extension in house.
I've looked at a couple options:
Use PHP DOTNET extension to call C# assembly.
As far as I can tell this extension does not work with .NET 4+ and the C# code requires 4.6 sadly.
Write a PHP extension.
So far I have only seen examples for Windows using Win32 and C++, idealy it would be nice if the extension could be written in C#. I have thoughts on making a lib using the C# code we need, then utilizing that inside the Win32/C++ extension and trying that if I absolutly have to.
Call the C# code as an external service.
As a very last option this would be viable and I can see this being more flexible for other sources to use (i.e. PHP, Java, C#, etc)
It would be interesting to be able to write a PHP Extension using C# assuming this is possible. I can see how this may not be the "best" option if it is possible though.
Thanks for reading and advice!!!

Coming off of #SevaAlekseyev idea I was able to get PHP to call C# using COM.
<?php
$object = new COM('ComClassExample.ComClassExample');
echo '1 and 1 added: ' . $object->AddTheseUp(1,1);
?>
Using the following site I was able to make a C# dll that exposed itself like a COM object. https://whoisburiedhere.wordpress.com/2011/07/12/creating-a-com-object-from-scratch-with-c/
And with a little tweak to the Post-build event I was able to get the new version to load for PHP (had to copy because PHP was getting an access denied message)
iisreset /stop
copy /Y "$(TargetPath)" C:\com\$(TargetFileName)
$(frameworkdir)\$(frameworkversion)\regasm.exe C:\com\$(TargetFileName) /codebase /tlb /nologo
iisreset /start
#JuanDelaCruz Peachpie looks like an interesting tool to keep in mind but it looks like it is meant to be compiled before deployment which wont work in our shop for the moment.
Thanks all!

How to use .win.dll C# wrapper (FatSecret API Wrapper)

I've delved into trying to use the FatSecret REST API directly from code, but getting it to work correctly has been pretty difficult. On my quest to get it working I ran into a FatSecret C# wrapper that looked appealing, found here:
https://fatsecretsharp.codeplex.com/
When I downloaded the folder from that site I found two files:
- FatSecretSharp.Win.dll
- FatSecretSharp.Win
What I wonder is how to actually include these files in a C# project and start using the wrapper.

Looks like I just needed to go to solution references and add the win.dll.

Using Mapnik in .net environment

Has anybody used Mapnik for rendering Maps from .net c# environment? I would like to use it to render maps in a desktop application developed under .net4. I found it the best open source map renderer tool, much more better, than the well known sharpmap, dotspatial (...). The 'only' problem is that it was written in C++ and Python and does not have a trivial way to use it from C#.
Do you know any .net Mapnik wrappers? Do you know any sample code?

I've just published my attempts in C# bindings.
They are available at: http://sourceforge.net/projects/mapniknet/

Some good new about Mapnik-.Net integration:
"Another thing that will help Windows developers is a way to use Mapnik from .Net languages. Although a full .Net wrapper is too much work besides all the other issues, hopefully I can make a meaningful start and open the door for .Net developers to leverage Mapnik in their applications."
Source: Mapnik homepage http://mapnik.org/news/2011/jun/09/gsoc_2011_windows_build_system_introduction/

NET-Mapnik
You might want to give this a try. Its pretty recent and has a simple example with options to create vector tiles.
https://github.com/kernelsanders/NET-Mapnik

So, finally I hacked it. Not a nice solution, but it works at least. In nutshell it operates in the following way:
developed a python script, which takes parameters as command line arguments. (using python api of mapnik)
call this python script by shell fom c# code (Process)
after map image has been generated, I show it in SharpMap as a background layer
In case of any map refresh (zoom, pan) I regenerate 'mapnik map layer'. I have also some kind of cache, in which I can store generated maps, so I can make tricks by using earlier generated map images or pre-generate them (e.g. generate maps for the next zoom level when user uses zoom tool). I also use some asynchron calls to do this, so I can create 1-3 map images paralelly.
The weak part of this solution is the communication between python and c# modules. I could not find better than command line arguments + shell.
My solution works, mapnik is fast, can genarate my maps less than a sec.
If you have any advice on .net - python communication (NO ironpython, it is not suitable for manik api), pls write it here. Thx.

Do you know about TAO Project?
It is a .Net project that takes unmanaged opengle library to .Net Managed Form by calling DllIMport() in C#.
You must do it for Mapnik, simaliar to TAOFramework.net