FileStream - Path found in console-application but not in mvc - json

Question

Iv'e used this guide drive quickstart and successfully got it worked in a console-app.
Now I'm trying to do the same thing in an mvc-application, but I got error when creating a new FileStream.
The code a use is exactly the same in mvc instead this time i'ts triggered by a button-click. This is my code:
using (var stream = new FileStream("client_secret.json", FileMode.Open, FileAccess.Read))
{
string credPath = System.Environment.GetFolderPath(
System.Environment.SpecialFolder.Personal);
credPath = Path.Combine(credPath, ".credentials/drive-dotnet-quickstart.json");
credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(stream).Secrets,
Scopes,
"user",
CancellationToken.None,
new FileDataStore(credPath, true)).Result;
Console.WriteLine("Credential file saved to: " + credPath);
}
// Create Drive API service.
var service = new DriveService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = ApplicationName,
});
// Define parameters of request.
FilesResource.ListRequest listRequest = service.Files.List();
listRequest.PageSize = 10;
listRequest.Fields = "nextPageToken, files(id, name)";
// List files.
IList<Google.Apis.Drive.v3.Data.File> files = listRequest.Execute()
.Files;
I got error at 'using (var stream = new FileStream("client_secret.json", FileMode.Open, FileAccess.Read))'
My 'client_secret.json'-file is stored at the root of my mvc project.
And I've done the step: Select client_secret.json, and then go to the Properties window and set the Copy to Output Directory field to Copy always.
Why is this not working in my mvc-app?
The error I get is 'System.IO.FileNotFoundException' - '{"Cannot find file c:\windows\system32\inetsrv\client_secret.json.":"c:\windows\system32\inetsrv\client_secret.json"}'