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How do I overwrite the default "site.css" that is generated -by something- in dotnet core in the account management mvc section

I have created a scaffolded SPA application where a default UI MVC project was created. I have managed to "scaffold" this where I now have all the .cshtml for account management files locally. I see a "site.css" file loaded from some location somewhere. I want to copy the contents of this file, place it locally -so I can edit it-.
I can simply remove the reference to site.css and add my own *.css reference. But it seems odd that a site.css file is being generated from somewhere and it isn't obvious where it comes from.
The only information I can find on this strange behaviour is:
Where is the site.css file located for Identity?
"you can override those by simply creating files in the same location in your project"
I have tried creating site.css in the "same location"(where is the same location?) but it didn't work. It still loads site.css

[project root]/wwwroot/css/site.css
All public facing files are in the wwwroot folder. So that is where your css, images, javascript, etc. files will go.
Note: "wwwroot" folder is near the top in the Solution Explorer, it doesn't follow the ABC ordering.

Website compilation process[AppCode DLLs]

We are working on a website project which contains around 1130 pages. After compilation, all the .aspx.cs files are converted into AppCode DLLs that has random names.
Whenever there are any changes in single .aspx.cs file[like a hotfix], we have to recompile and deploy the entire project on the application host.
We want to update only those files that have been changed and not the entire package.
One of a solution we are aware is that, converting Website to Web application; but we cannot implement that change at this stage of the project.
Is there any other way to find an efficient solution for this?

Yup. Talking in Visual Studio 2010:
While publishing the website, Select the option: 'Use Fixed naming and single page assemblies', Also select 'Allow this precompiled site to be updateable'.
After website is published. Go to the published folder. Open any aspx page (not the dll or .cs).. Note the dll name in page attribute under inherits attribute. Than using ftp or any other way to upload, copy or upload tht dll under bin to your website.
Also, you can create a doc or txt file to list all Dll names with respective paths to your file to easily know which dll to upload next time if there is any change.
Hope it helps.

In an ASP.NET website with a codebehind at what point are the .cs files compiled?

In Brief:
In an ASP.net website with a code-behind, at what point are the *.cs files compiled?
Context:
A colleague who has since left, deployed a website with a .cs code-behind to a shared server. I have made a small change to a .cs file, which I should expect to reflect on one of the pages but it has not yet appeared. I have restarted the application pool, however I am loathe to reset IIS on the server as there are couple of other teams' apps which might be be in use on the same server.

This applies to Web Application projects as opposed to Web Site projects, which are CodeFile by default, and don't allow changing the build action...
In ASP.NET Web Applications you have two methods of deploying your pages; CodeFile and CodeBehind. By default pages will always use CodeBehind but you can change this.
CodeBehind
CodeBehind compiles your .cs file into the .dll file in your bin folder at compile/build time, and then you deploy that to your web server. There is no need to deploy the .cs file to your web server. If you do, it will just sit there being unused.
To configure a page with CodeBehind, ensure that:
The page directive in your .aspx file has CodeBehind="your.aspx.cs"
The properties of the .cs and .designer.cs files in solution explorer have a build-action of compile.
CodeFile
This causes ASP.NET to compile the .cs file on-the-fly on the server. This means that your .cs file needs to be deployed to the web server. It also means that your .cs file will not be compiled at compile/build time and therefore not built into your .dll in the bin folder.
Key advantage
With CodeFile, You can make changes to the .cs file and deploy just that file to see the changes on your production web server. No need to re-deploy. No need to recycle the app pool. This can be very useful in a lot of situations.
To configure a page with CodeFile, ensure that all of the following are met:
The page directive in your .aspx file has CodeFile="your.aspx.cs"
The properties of the .cs file in solution explorer have a build-action of content
The properties of the .designer.cs file in solution explorer have a build-action of none.
Notes
Intellisense doesn't like working when pages are set up with
CodeFile (you can change to CodeBehind whilst coding and then change back for deployment, though).
If you change from CodeBehind to CodeFile, then always do a
rebuild and re-deploy (and vice versa). This is because when the page was CodeBehind,
the .cs was compiled into the .dll in the bin folder, and will
remain there when you change to CodeFile. The CodeFile will be
compiled on-the-fly and you will get the same code/classes defined in
the .dll and in the on-the-fly compiled code, which will lead to
runtime errors.

For the setup I use, the .cs files are compiled when building the project. This means it is the .dlls in the bin that need to change, not the .cs files directly.
The .aspx files can change at any time, but I think you need to rebuild the project in order for the code behind to take effect.
I have replaced singular .dlls before without any problem (though it's not good practice).

Apparently what you have done should work.
Check if Cacheing has been implemented.
Otherwise publish the code and deploy the dll, instead of .cs file. I would recommend to test in staging server before you go live.

ASP.NET MVC Global Resource File deployment

In my mvc3 web project I have an App_GlobalResources folder containing the resource file Permissions.resx.
I am able to access the values in this file when I run the site locally in visual studio using:
string value = (string)HttpContext.GetGlobalResourceObject(resourceClass, key);
However, once I deploy it to the production web server it is not able to access the values in this file. I checked and it is creating App_GlobalResources in the bin folder of the publish directory containing the file.
My first time using global resource files, is there any additional steps required to get this working once deployed to the webserver?
Thanks.

I'm pretty sure App_GlobalResources should not be created in the bin folder. Have you got Copy to output folder set? (You shouldn't need it).
In WebForms, in properties of the .resx files, we have Build Action set to Content and Custom Tool set to GlobalResourceProxyGenerator. This creates dlls for the resources in the bin folder.
However, I've not used App_GlobalResources in MVC (it makes things tricky to test outside of a web context), but there's some info here that might be useful:
http://odetocode.com/Blogs/scott/archive/2009/07/16/resource-files-and-asp-net-mvc-projects.aspx

Does an assembly maintain its directory structure?

Since all files in a web project are compiled into single assembly, then does this assembly maintain a directory structure? For example, if a file in a root directory references a file in a subdirectory, then how could this reference still be valid when the two files get compiled into same assembly?
Assume a web project has the directory structure shown below.
Since all of web project’s ASPX files get compiled into a single assembly WebProject1.dll, how is this assembly able to record/memorize the directory structure?
Thus, when you deploy WebProject1.dll to a web server and user makes a request for http://WebProject1/some_SubDir/default.aspx, how will WebProject1.dll be able to figure out which Page to render?
WebProject1\SubDir (where WebProject1 is a root directory)
WebProject1 -- contains several ASPX files
WebProject1\SubDir -- contains a file default1.aspx.
When we deploy the Web project, must we create the same directory structure on a web server (WebProject1\SubDir), even though we won’t put any ASPX files into those directories?
I assume that on Web server WebProject1.dll should be placed into the Bin directory?
thanx
EDIT:
Only the sourcecode is compiled into the assembly, you still need to upload the aspx files into a matching directory on the server.
My book says that when using Web project all web code is compiled into single assembly. I thought “all code” includes aspx files?!
Links are maintained between the page and it's code behind file through a class declaration which by default is in a namespace that matches the directory structure
So if I add a new aspx page via Project --> Add New Item, and store this aspx page in a subdirectory named Hey, then this page will reside in namespace WebProject1.Hey?!
But how do I do add new item into a subdirectory, since Project --> Add New Item doesn’t give me an option to browse and choose a directory I wish to save it in, but instead automatically creates aspx file in a root directory?
The relative path is kept when the compiler generate the dll.
I’m not sure I know what relative path you’re referring to?
thanx

Only the sourcecode is compiled into the assembly, you still need to upload the aspx files into a matching directory on the server. For example you project in Visual Studio may look like the following:
WebProject1 (The root project)
|
|- some_SubDir (A physical directory inside the project)
|
|-default1.aspx
|-default1.aspx.cs (assuming a C# project)
Once you have compiled the web app you'll need to upload the following to the server:
WebProject1 (The root directory for your website)
|
|-bin (The binary directory created by the build)
|
|-WebProject1.dll (The compiled source code of the web app)
|-some_SubDir
|
|-default1.aspx (The file that will map to the URL www.websitename.com/some_subdir/default1.aspx)
Compiled resources (non-sourcecode files that are compiled and stored inside the assembly) are different issue that are addressed in your other question
Edited to add direct answers to the questions:
Not all files are compiled into the assembly, only source code files are. Links are maintained between the page and it's code behind file through a class declaration which by default is in a namespace that matches the directory structure, but it doesn't have to be.
Your default1.aspx file will have in the header something like:
The inherits line tells the webserver that when a user requests this page it should be processed in conjunction with the source code that defines that class, which it will find inside the compiled assembly. The combination of the physical aspx file and the compiled class will generate standard html which is then passed back to the client.
Yes, you need to create the same directory structure, but you are required to put the aspx files in there.
Yes
(can someone please edit this if they know how to get the list items to number correctly, please?)

All those path information will be embedded as Meta Data/resource file, so, you can deploy it safely to the server. The relative path is kept when the compiler generate the dll.
I suggest you use Reflector to open the dll, and you can get a much more deeper understanding what is inside dll.

Notice how some_Subdir/default1.apsx has a 'Inherits' key/value pair in the page declaration?
What this means is that when you make a request for that resource IIS goes 'Ah ha! Asp.Net needs to handle this request! Hey asp.net please return me some html to send down'
Asp.net parses that aspx file and creates a proxy class on the fly that inherits from WebProject1.some_Subdir._Default1. This proxy class then parses out the control tree and html, and kicks off the page life cycle (this is overly simplified, and I'm sure I've missed some details).
So the WebProject1.dll is just the actual C# / VB of your web app, but in concert with the asp.net worker process and the markup you can render html back to a client.