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C# .net MVC, set path to Google Application Credentials JSON file

I've just got this Google Sample Project to work on my VS2015,
However, after I published to "IIS" and host it, when I opened the link, the web page kept showing this message as the picture showed
I added the key to the web.config, but still doesn't work, just wondering if anyone had done this before, I really need help, thank you!
Edit: Here is my code
Web.Config
<appSettings>
<!-- Set to your Google project id as shown on the Google Developers Console -->
<add key="GoogleCloudSamples:ProjectId" value="gdtest-1332" />
<add key="GOOGLE_APPLICATION_CREDENTIALS" value="D:\ProjectCloud\gdtest-12323.json" />
<!--
Set to either mysql or datastore.
If using mysql, update the connectionString far below, and then run Update-Database in the
Package Manager Console.
-->
<add key="GoogleCloudSamples:BookStore" value="datastore" />
<!-- Set to your Google Cloud Storage bucket -->
<add key="GoogleCloudSamples:BucketName" value="cloudstoragetestbillez" />
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />

Programmatically set an environment variable at runtime as such:
string credential_path = #"C:\..\key.json";
System.Environment.SetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS", credential_path);
I'm not an expert with IIS but it won't seem to pick up on environment variable set in your desktop environment.

Restarting the Visual Studio 2017 did it for me for Console Application.
Console.WriteLine(System.Environment.GetEnvironmentVariable("GOOGLE_APPLICATION_CREDENTIALS"));

From google documention it seems it is env var and not web.config.
If you are using a service account credential, set the environment variable GOOGLE_APPLICATION_CREDENTIALS to the path to the JSON credential file you downloaded.

With command prompt:
set GOOGLE_APPLICATION_CREDENTIALS=[PATH_JSON]
You don´t need setting credentials on code

Google says:
After creating a service account, you have two choices for providing the credentials to your application. You can either set the GOOGLE_APPLICATION_CREDENTIALS environment variable explicitly, or you can pass the path to the service account key in code.

Security Exception

Here i have published my MVC web application, but it can't open due to the Security Exception Error.
I have tried to use <trust level="Full" /> and <securityPolicy> as well. If i applied one of these to solve Security Exception, it show Configuration Error:
I would appreciate your help, if you have an alternative way to solve this problem.

This sounds much like, security issue that your IIS is experiencing, can you see is your web application have rights to the folder or your Application pool?

Enable anonymous authentication mode in project properties
and in the Web.Config file add
add key="enableSimpleMembership" to value="true"
add key="autoFormsAuthentication" to value="true"
Hope it will work.

how to redirect from folder in a web server

i have two different applications, one is a website project running on the the server root, the second is a web application project in a folder, both projects have their configuration files, and i am putting the link in the configuration file of the website project
i am trying to redirect users from the website project to the web application project, whenever i use this:
<add key="CoronaPortalAddress" value="http://localhost/coronaportal/Security/ApplicantSignIn1.aspx?applicationType=" />
<add key="CoronaPortalSignInPage" value="http://localhost/coronaportal/Security/SignIn.aspx" />
<add key="CoronaPortalTimeTablePage" value="http://localhost/coronaportal/Conona Schools_ Trust Council_ApplicantTestScores/TimeTable1.aspx" />
<add key="CoronaPortalResultsPage" value="http://localhost/coronaportal/ParentReportLogin.aspx" />
users will be redirected, though on the url it will showing localhost, so i change it to:
<add key="CoronaPortalAddress" value="http://www.shodsystems.com/coronaportal/Security/ApplicantSignIn1.aspx?applicationType=" />
<add key="CoronaPortalSignInPage" value="http://www.shodsystems.com/coronaportal/Security/SignIn.aspx" />
<add key="CoronaPortalTimeTablePage" value="http://www.shodsystems.com/coronaportal/Conona Schools_ Trust Council_ApplicantTestScores/TimeTable1.aspx" />
<add key="CoronaPortalResultsPage" value="http://www.shodsystems.comcoronaportal/ParentReportLogin.aspx" />
now it throwing error:
It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS
i tried to google this, but couldnt fix it, any assistance would be appreciated.

ASP.NET BlogEngine.NET HTTP 403 Error (Admin Pages Only)

I recently installed the latest version of BlogEngine.NET (v3.0). The blog itself renders fine on my browser (i.e., viewing the main page, individual blog posts, etc.) However, when I log in and try to access any of the Admin pages (i.e., Settings, Users, etc.), I am getting an HTTP 403 (Forbidden) error.
This is happening on both Windows Server 2008 R2 x64 as well as Windows Server 2012 x64. When I installed a local copy on my Windows 8.1 Pro machine, it works fine.
I know the admin pages all render in MVC-style, since the URL is "/admin/#/settings", for Settings for example.
I have literally tried everything. I verified that the application pool identity has Write permissions to the entire web site folder structure.
Any thoughts/ideas? I am completely stuck and would appreciate any guidance. Thanks in advance.
* UPDATE *
Some progress- I tried creating a standalone website in IIS just for BlogEngine.NET, i.e., http://www.example.com instead of http://www.example.com/blog, and it worked flawlessly.
Therefore, something is going screwy with the permissions when I am creating an Application within the main Website (i.e., www.example.com/blog).
Thoughts?

Ancient post, but adding these <appSettings> helped for me:
<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="true" />
</appSettings>
Alternatively, you can start the section by getting rid of all inherited values:
<appSettings>
<clear />
<!-- Other settings here -->
</appSettings>
In my main site I explicitly had a setting <add key="webpages:Enabled" value="false" />, so that explains why it was necessary to add this.
You also need to do this for other sections, like <connectionStrings>.

Can't set default page on Azure Website

I published an Asp.Net web app on Azure website from Visual Studio and I can't manage setting a default page.
I have added this to web.config
<defaultDocument>
<files>
<clear />
<add value="Default.aspx" />
</files>
</defaultDocument>
I left only the "Default.aspx" on Azure control panel in Default Documents.
But when typing a hostname in address bar, I still get "The resource you are looking for has been removed, had its name changed, or is temporarily unavailable".
How can I do it properly?
Thanks

When creating a website on azure I've chosen Asp.net Emply Website and the Default page (of my own) simply doesn't work there. Then I have created by an option of 'Quick Create' and it works great.

Go to App_Start\RouteConfig.cs and edit the rule properly. Or just delete them.