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ASP.NET website in production goes down after while (Could not load file or assembly...)

I have problem with web site which is made in asp.net, in dev everything works fine, but since I published it to a server, I faced next issue :
After some time some items appeard in my folder called "Temporary ASP.NET Files" and I realized when there is few stuffs web site goes down and it shows this screen:
And what I saw in my TEMP folder was next:
AND TEMPORARY SOLUTION WAS TO DELETE FILES IN THAT FOLDER BUT AFTER WHILE THEY ARE AGAIN THERE AND SITE GOES DOWN.
I TRIED WITH PREVENTING USER TO WRITE THAT FOLDER BUT THAN I GOT ANOTHER ERROR WHEN I TRY TO ACCESS MY WEBSITE, SOMETHING LIKE :
...can not write to ... folder..
Thanks guys,
And kind of suggestion will be really great!
Thanks!

You have to add the XXXXX.dll files to the bin folder on your server.
Some times (I don't know why) some DLLs are not part of the project and you have to copy manually. If the file(s) already exists, you can replace the file with your local DLLs.

Check:
1. Project Framework VS Application pool.
2. Check all Dll's if include and its framework too.
3. Check eSavez_Servis Framework.
Just simulate your problem one by one.

Visual Studio 2015 Working Directory not being applied to C# project

So this is something that I expected to be simple, but I am not sure what is going wrong.
I am working on a C#, ASP.NET Web API project, and I am trying to set a content path to some folder in the solution's root directory.
For some reason, no matter what I set the Working directory option to under Properties > Debug, printing out Directory.CurrentDirectory() in my applications startup logic is always the default (somewhere in the bin directory for that project). I tried using $(SolutionDir), but found that is not supported in C#. I then tried some relative paths and absolute paths but nothing is working.
Am I missing something here? Is this setting just not used for C# projects or does it have something to do with it being a ASP.NET project? I found other questions on here asking how to set the current directory, but the answers were to use exactly the setting I have been using.
I know I can technically just change where the build executable is located, but that seems like an ugly work-around when the logic of the application already uses the working directory.
EDIT: Some more details in response to some comments.
So the premise of this project is it is a C# Web API that serves as a backend for an angular app. The angular app is built separately into a zip file which is then stored in the resources of the C# program. Upon running, the files are extracted and served on localhost for client machines. When the program is run in debug mode, however, it just sets a root content path and serves the raw files for the angular frontend. My goal here is to remove some manual configuration in debug mode as to where the angular frontend is is on disk. It is checked into the root of the solution directory, so I am trying to set the current working directory for debugging to the solution directory, and then the program will just be able to work normally when being debugged from Visual Studio.
I hope that isn't confusing things further.

What files do I upload in a C# Web API project?

** Dumb questions alert **
I created my first Web API project. I would like to test it on my web host, but I can't figure out what files to upload. I tried to upload everything from the HelloWorld folder, but I get a 403 "Access is denied" error when I attempt to access the files.
Once I upload the folders/files, how do I access them? Do I have to navigate to the Root > Views > Home > ... ?
Folder Structure
HelloWorld
HelloWorld
_UpgradeReport_Files
1 css, 1 xslt, 4 pngs
HelloWorld
All of my folders and files
This is what I tried to upload
packages
A lot of ASP and JQuery folders
Thank you for your help.

I think you have two separate problems here: knowing what files to deploy and getting the permissions correct so that you can access them.
In general, the files you will need to deploy are all of your static files (images, CSS, Javascript, HTML), any .cshtml/.aspx/.ascx/.asax files, and Web.config. However, the easiest (and best) way to know what files to deploy is to use Visual Studio's publishing mechanism. Go to Build->Publish, and publish to a local directory. Open that directory, and you'll see all the files you need to deploy.
As far as the second problem, that's more complicated. The solution depends on the version of IIS, but the basic upshot is that you need to give the correct user access permissions to your file. Depending on your version of IIS and how it's confusing, it will either be IUSR, IIS_IUSRS, or NETWORK SERVICE. Try Googling for "file permissions IIS ".

Error: Could not download silverlight application. Check web server settings

Developing a silverlight page in already existing web application for previewing video files. When I create a asp.net application locally and add silverlight application on the solution it works perfectly. But while I am trying to include into already existing project it throws this error. I have not deployed into the IIS. this happens while debugging.

Check the path to your xap file in your webpage. It should be something like:
/ClientBin/my.xap
Also ensure that your xap file is actually in the ClientBin folder. In the web application Properties, choose the Silverlight Applications tab and add the silverlight project to the list.
Although probably not applicable in your case, this can also occur if you are using iis and haven't registered the correct mime type for .xap files. It should be set to application/x-silverlight-app.

This is little same with another answer, but I give my detailed solution with image of setting.
In my case, one of my aspx page will load Zip and Xap files under ClientBin Folder, normally it'll load 20 Zip/Xap files under ClientBin\,
But I found that when building/publishing the project, the Zip/Xap files are NOT output to ClientBin\, that is ClientBin folder is nearly empty.
So my solution is to let the Zip/Xap files output to ClientBin\, to do this, the setting way can see this article:
https://social.msdn.microsoft.com/Forums/silverlight/en-US/d8e2c92a-4b31-4e4b-a440-4960a8d475b4/how-to-generate-xap-file?forum=silverlightstart
Besides here is the screenshot of my setting, that is Right click at your Silverlight project > Properties > Silverlight Application, and you can click the Add button to add content,

How to Backup a webservice?

The problem is I reinstalled my computer and the backup didn't work so now all my sourcecode is gone... But my webservice is still running on a webserver.
When I upload the new website the old site will be deleted, so how can i backup the webservice and make it a part of my new website?
In the bin folder of the webserver there is some strange name files like App_web_cjcpmkr8.dll,
can I just download these files and .asmx files? Isnt there then missing a link between the files? How can I see which .asmx files uses which .dll files?

Unfortunately they're all compiled- depending on your site's config, there will be either one assembly per page or per directory. You can download all the DLLs and decompile them through reflector- the decompiled class names should help you match them up with the corresponding markup, but you'll still have some reconstructive surgery to do.

The magic link between the asmx and the dlls lies in the name of the bin folder. IIS will automatically look for dlls in this folder. You should be able to deploy your web service on a new web server by just copying the files. I recommend that you try to set up a copy of the service on a new web server, before you delete anything.

If this is critical data get a service to try and get your files back. If not then moving forward invest in an online backup solution / source control utility.
This will save you tons of time when this happens again. I use source control on a remote server combined with a subscription to Carbonite locally to ensure that I don't lose that precious data; both the data checked in and the data that I'm currently working on. It's Iike $45 a year and well worth it.
As for your data I'm sorry that you've lost it. I'm sure you’re not the first to have this happen.