[You should ignore `.vs` folder all together](https://stackoverflow.com/questions/31878901/should-i-add-the-visual-studio-2015-vs-folder-to-source-control).

However, there are cases where you want to persist some config on your applicationhost.config file such as registering FQDN as explained [here](https://docs.microsoft.com/en-us/aspnet/web-api/overview/security/external-authentication-services#FQDN).

For this type of config, you want to use the global application host file where you can persist your changes.

In a classic Web Application project (where you have `.csproj` file), you need to set the `UseGlobalApplicationHostFile` property to `true` inside the `.csproj` file:

    &lt;UseGlobalApplicationHostFile&gt;True&lt;/UseGlobalApplicationHostFile&gt;

VS 2015 honors this and uses the global application host file. However, there is no way to tell ASP.NET 5 projects to look for this today as far as I know.

If you need custom configuration for IIS Express ([example][1]), add the file to source control so that it is shared with the team. If not, you can exclude this file, and VS2015 will recreate it as needed.


  [1]: https://stackoverflow.com/a/19310109/145173

From web application design and development point of view, how do Express and Hapi compare to each other? For basic examples they seem similar, however I&#39;m interested to learn more about key differences in overall application structure.

For example, as far as I have learned, Hapi uses a [different][1] routing mechanism which does not take registration order into account, can do faster lookups, but is limited comparing to Express. Are there other important differences?

There is also an [article][2] about choosing Hapi (over Express) for developing the new npmjs.com website, this article states that &quot;Hapi’s plugin system means that we can isolate different facets and services of the application in ways that would allow for microservices in the future. Express, on the other hand, requires a bit more configuration to get the same functionality&quot;, what does it exactly mean?


  [1]: https://gist.github.com/hueniverse/a3109f716bf25718ba0e
  [2]: http://blog.npmjs.org/post/88024339405/nearing-practical-maintainability

How do Express and hapi compare to each other?

I have followed the instructions here: 

https://stackoverflow.com/questions/21329250/the-developers-of-this-app-have-not-set-up-this-app-properly-for-facebook-login/26135600#26135600

Made my app public and the circle is green so the app is public.

But when I try to login, I go to the Facebook app, it asks me to login which I do and then I get this message:

App Not Setup: This app is still in development mode, and you don&#39;t have access to it. Switch to a registered test user or ask an app admin for permissions.

BTW: I am the admin

Any help is much appreciated. I am using SeattleClouds and this happens on both iOS and Android.


App not setup: This app is still in development mode

Visual Studio 2015 adds a file named `.vs\config\applicationhost.config`
 to the root of a solution when an ASP.NET Web application project is created.

Should this file be checked in to source control or should it be ignored (so that each user will have their own local copy)?

.vs\config\applicationhost.config in source control

<p>Visual Studio 2015 adds a file named <code>.vs\config\applicationhost.config</code>
to the root of a solution when an ASP.NET Web application project is created.</p>
<p>Should this file be checked in to source control or should it be ignored (so that each user will have their own local copy)?</p>


From previous versions of the question, there is this: [Browse website with ip address rather than localhost](https://stackoverflow.com/questions/14881515/browse-web-site-with-ip-address-rather-than-localhost), which outlines pretty much what I&#39;ve done so far...I&#39;ve got the local IP working.  Then I found ngrok, and apparently I don&#39;t need to connect via the IP.  

___

What I am trying to do is expose my website running on localhost to the internet. I found a tool that will do this: ngrok.  

Running the website in visual studio, the website starts up on localhost/port#. I run the command &quot;ngrok http port#&quot; in the command line.  Everything seems to start up fine.  I generate a couple of URLs, and the ngrok inspection url (localhost:4040) works.  

The only problem is that when I go to the generated URLs, I get an HTTP error 400: bad request invalid hostname.  This is a different error than when I run &quot;ngrok http wrongport#&quot;, which is a host not found error...so I think something good is happening.  I just can&#39;t tell what...

Is there a step I am missing in exposing my site to the internet via the tunneling service? If there is, I can&#39;t find it in the ngrok documentation.  

Exposing localhost to the internet via tunneling (using ngrok): HTTP error 400: bad request; invalid hostname

I have some concerns using async actions in ASP.NET MVC. When does it improve performance of my apps, and when does it *not*?

 1. Is it good to use async action everywhere in ASP.NET MVC?
 2. Regarding awaitable methods: shall I use async/await keywords when I want to query a database (via EF/NHibernate/other ORM)?
 3. How many times can I use await keywords to query the database asynchronously in *one* single action method?



When should I use Async Controllers in ASP.NET MVC?

As currently there is lack of documentation on DI topic - [Dependency Injection][1]. What are pros/cons of using built-in DI over existing solutions like (Ninject, Autofac, StructureMap)? And what are current limitations of default dependency injection (if any)?


  [1]: https://docs.asp.net/en/latest/fundamentals/dependency-injection.html

Why would one use a third-party DI Container over the built-in ASP.NET Core DI Container?

I&#39;ve done this before with MVC5 using `User.Identity.GetUserId()` but that doesn&#39;t seem to work here.
The `User.Identity` doesn&#39;t have the `GetUserId()` method.

I am using `Microsoft.AspNet.Identity`.

How to get the current logged in user ID in ASP.NET Core?

I&#39;ve installed website on my local machine using IIS 7 successfully.
But when I&#39;ve deployed it on live server, I got the following error:
&gt; &quot;The page cannot be displayed because an internal server error has occurred&quot;
Nothing else.


Using the same IIS 7 on live and also set to have `Detailed errors` in Error Pages module, but still getting the same.
What can be a reason?

Thanks


The page cannot be displayed because an internal server error has occurred on server

Background
---
We have a project that we&#39;re developing in VS 2015 with C#6 enabled that occasionally needs to be opened by developers using VS 2013 without C#6. 

We have no intention to use C# 6 within this particular solution (as much as I&#39;d like to).

Problem
---
Visual Studio and ReSharper suggest helpful C# 6 language constructs that render the solution inoperable in earlier versions of Visual Studio without C#6 support.

I&#39;ve [disabled the ReSharper C#6 support](https://stackoverflow.com/questions/27621458/resharper-disable-c-sharp-6-0-support) but I can&#39;t seem to disable / limit C# features across the whole solution.

Question
---
How do I limit C# to C#5 capabilities within a solution or within Visual Studio 2015?

How do I disable C# 6 Support in Visual Studio 2015?

I am trying to install [Visual Studito 2015 RC][1] Community edition.

I downloaded the web installer and installed all components. After installation, I rebooted my machine as instructed, but it keeps giving me the same error when I try to make an application. Please see the screen below:

![Screenshot showing the error &quot;Project ... could not be opened because the Visual C# 2015 RC compiler could not be created.  Please re-install Visual Studio.&quot;][2]

I have tried [this answer][3] and [this answer][4] from earlier versions of Visual Studio. It resets the settings but ultimately had the same error.

I have also tried removing `C:\Users\Gogol\AppData\Local\Microsoft\VisualStudio` folder, but again, no luck.

I also have `devenv.exe` added to the path. I can access `devenv` in command prompt.


  [1]: https://www.visualstudio.com/en-us/downloads/visual-studio-2015-downloads-vs
  [2]: http://i.stack.imgur.com/YCwPX.jpg
  [3]: https://stackoverflow.com/a/773787/1437261
  [4]: https://stackoverflow.com/a/13639375/1437261

Application Can&#39;t Load. Visual C# 2015 RC Compiler Could Not Be Created

Microsoft recently released [Visual Studio Code][1] and I am a little confused about its usage, since [Visual Studio][2] has lot of functional similarities with it. 


  [1]: https://code.visualstudio.com/
  [2]: https://www.visualstudio.com/

What are the differences between Visual Studio Code and Visual Studio?

There&#39;s a number of keyboard shortcuts and menu commands to automatically expand or collapse all foldables in the current document. &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;M&lt;/kbd&gt;,
 &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;L&lt;/kbd&gt; toggles all foldables recursively, from the top namespace down to the inner methods and comments. Basically everything that has a [+] icon in the left margin. &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;M&lt;/kbd&gt;, &lt;kbd&gt;Ctrl&lt;/kbd&gt;+&lt;kbd&gt;O&lt;/kbd&gt; does it bit less, but it still touches methods and comments inside the class.

I&#39;m looking for a function that specifically **only** regards `#region` foldables and nothing else. Not namespaces, classes, comments, or methods. I really only want to fold those areas that are explicitly marked as such with the `#region` keyword.

Is there any hidden shortcut or an extension for that?

I&#39;d prefer a keyboard solution, for Visual Studio 2015 (RC for now).

In case somebody asks why: I want to get an overview of the file, but immediately see all the details when I decide to look inside one region.

------

Update:

## Solution in 2020

As this question has received many answers, some of them useless, others outdated, the working solution for Visual Studio 2019 can be found in this underappreciated answer here: https://stackoverflow.com/a/58999093/143684

Collapse all #regions only(!) in C# (Visual Studio)

**Visual studio that won&#39;t be repaired...**  
Everytime I want to compile an app on vs 2015 - it crashes. Even if I want to compile the main function or write somthing to it, there appears a window, which says 
&gt; *Visual Studio 2015 has stopped working*

It goes same on 2013 Express version.
I have a clue why it won&#39;t work: when I open Team Explorer, an error appears:   

&gt; Page &#39;3185ed96-1cbd-4381-a439-636973542e50&#39; not found.

I tried everything I have found in the internet and trust me - nothing worked.
I also tried some command prompt commands:


    devenv.exe/ debug  
    devenv.exe/ resetsettings  
    devenv.exe/ instalvstemplates  
    devenv.exe/ resetskippings  
    devenv.exe/ resetuserdata  
    devenv.exe/ setup  
    devenv.exe/ safemode  

**Debug mode gave me some info about the error:**

An unhandled exception of type &#39;System.InvalidOperationException&#39; occurred in mscorlib.dll

Additional information: The service &#39;`Microsoft.Internal.VisualStudio.Shell.Interop.SVsUIThreadInvokerPrivate`&#39; must be installed for this feature to work.  Ensure that this service is available. HRESULT = 0x80004002



An exception was encountered while constructing the content of this frame.  This information is also logged in &quot;C:\Users\admin\AppData\Roaming\Microsoft\VisualStudio\14.0\ActivityLog.xml&quot;.

    Exception details:
    System.ArgumentException: Parametr is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))
       at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
       at Microsoft.VisualStudio.Shell.Package.CreateToolWindow(Type toolWindowType, Int32 id, UInt32 flags)
       at Microsoft.VisualStudio.Shell.Package.CreateToolWindow(Type toolWindowType, Int32 id, ProvideToolWindowAttribute tool)
       at Microsoft.VisualStudio.Shell.Package.FindToolWindow(Type toolWindowType, Int32 id, Boolean create, ProvideToolWindowAttribute tool)
       at Microsoft.VisualStudio.Shell.Package.CreateToolWindow(Guid&amp; toolWindowType, Int32 id)
       at Microsoft.VisualStudio.Shell.Package.Microsoft.VisualStudio.Shell.Interop.IVsToolWindowFactory.CreateToolWindow(Guid&amp; toolWindowType, UInt32 id)
       at Microsoft.VisualStudio.Platform.WindowManagement.WindowFrame.ConstructContent()

**But still nothing I was able to find has worked.**

I reinstalled VS and repaired it - still nothing.
Then I have downloaded some .dlls, microsoft visual c++ redistributable packages and used Ccleaner to clean registry.
I think it&#39;s a very strange error; if you could advise me on a fix please? 


   

Visual Studio 2015 crashes

I&#39;m working with ASP.NET Core application. I&#39;m trying to implement Token Based Authentication but can not figure out how to use new [Security System][1].

**My scenario:**
A client requests a token. My server should authorize the user and return access_token which will be used by the client in following requests.

Here are two great articles about implementing exactly what I need:

  - [Token Based Authentication using ASP.NET Web API 2, Owin, and Identity][2]
  - [Using JSON Web tokens][3]

The problem is - it is not obvious for me how to do the same thing in ASP.NET Core.

**My question is:** how to configure ASP.NET Core Web Api application to work with token based authentication? What direction should I pursue? Have you written any articles about the newest version, or know where I could find ones?

Thank you!

  [1]: https://github.com/aspnet/Security
  [2]: http://bitoftech.net/2014/06/01/token-based-authentication-asp-net-web-api-2-owin-asp-net-identity/
  [3]: http://odetocode.com/blogs/scott/archive/2015/01/15/using-json-web-tokens-with-katana-and-webapi.aspx

Token Based Authentication in ASP.NET Core (refreshed)

In MVC 5, I had the following extension methods to generate absolute URLs, instead of relative ones:

    public static class UrlHelperExtensions
    {
        public static string AbsoluteAction(
            this UrlHelper url,
            string actionName, 
            string controllerName, 
            object routeValues = null)
        {
            string scheme = url.RequestContext.HttpContext.Request.Url.Scheme;
            return url.Action(actionName, controllerName, routeValues, scheme);
        }
    
        public static string AbsoluteContent(
            this UrlHelper url,
            string contentPath)
        {
            return new Uri(url.RequestContext.HttpContext.Request.Url, url.Content(contentPath)).ToString();
        }
    
        public static string AbsoluteRouteUrl(
            this UrlHelper url,
            string routeName,
            object routeValues = null)
        {
            string scheme = url.RequestContext.HttpContext.Request.Url.Scheme;
            return url.RouteUrl(routeName, routeValues, scheme);
        }
    }

What would the equivalent be in ASP.NET Core?

 - `UrlHelper.RequestContext` no longer exists.
 - You can&#39;t get hold of the `HttpContext` as there is no longer a static `HttpContext.Current` property.

As far as I can see, you would now require the `HttpContext` or `HttpRequest` objects to be passed in also. Am I right? Is there some way to get hold of the current request?

Am I even on the right track, should the domain now be an environment variable, which is simple appended to the relative URL? Would this be a better approach?

Getting absolute URLs using ASP.NET Core

I have seen various frameworks targeted in *project.json* files, using names such as `netcore50`, `dotnet`, `dnx451`, `net45`, and others. The [documentation for the &quot;framework&quot; section project.json](https://github.com/aspnet/home/wiki/Project.json-file#frameworks) does not (yet) specify how to use this section for different frameworks.

What frameworks are available and what name should be used in *project.json* to target each?

What frameworks are available in ASP.NET Core (ASP.NET 5) applications?

I&#39;m looking at asp.net vnext [engineering guideline](https://github.com/aspnet/Home/wiki/Engineering-guidelines) and have noticed that they recommend to use `NotNull` attribute instead of explicit checking of input argument for null and throwing `ArgumentNullException`. The thing that confused me is that base on this guideline it is just enough to declare this attribute and the checking code will be generated at compile time into the method body. I&#39;ve tried to do this in my test project however the magic didn&#39;t happen i.e. it threw the exception `System.NullReferenceException` instead of `System.ArgumentNullException`. How this is supposed to work? Are they going to use some AOP library to inject the checking code at compile time?

NotNull attribute

This is running on Windows Server 2008 and used to work several months ago.  I am just now using this server again for some dev work with VS.

This is live web server used to serve up a few test sites as well.

This came up when running Visual Studio, then launching my projects for debugging.

Trying to launch any site through `localhost:xxxx` when IISExpress has been launched (using actual port #&#39;s in the config to access different sites):

    This webpage is not available
    
    ERR_CONNECTION_REFUSED


I have been at this for a few days already, as I have read others have had similar issues, tried [most things][1] I have read including changing the `managedruntimeversion` from &quot;v4.0&quot; to &quot;v4.0.30319&quot; for .net 4.5 (I have never had to do this before) and disabling the logging module (all suggestions found [here][1]).

There are only two entries in my `hosts` file that point to internal server IP addresses.  No `localhost` related IP&#39;s or references.

I have gone as far as re-installing IIS Express, and Visual Studio 2013. I also created a brand new `WebApplication` site to try to resolve this (simple and no other complicated bindings).

When I spin up Fiddler, I see the following on the page:

    [Fiddler] The socket connection to localhost failed. 
    ErrorCode: 10061. 
    No connection could be made because the target machine actively refused it 127.0.0.1:23162

[![Fiddler capture][2]][2]

I have removed all proxy settings from IE&#39;s LAN connection section, where before I was getting a *red-x* popup in VS indicating something like *IISExpress could not launch*.

This is not a matter of SSL vs non SSL.

I had TFS Server installed - uninstalled that in case there were some odd bindings that were interfering.

I tried deleting the IISExpress config/settings folder several times.

Current *applicationhost.config* contains:


    &lt;site name=&quot;WebApplication1&quot; id=&quot;4&quot;&gt;
                    &lt;application path=&quot;/&quot; applicationPool=&quot;Clr4IntegratedAppPool&quot;&gt;
                        &lt;virtualDirectory path=&quot;/&quot; physicalPath=&quot;C:\TFS-WorkRepository\Sandbox\WebApplication1\WebApplication1&quot; /&gt;
                    &lt;/application&gt;
                    &lt;bindings&gt;
                        &lt;binding protocol=&quot;http&quot; bindingInformation=&quot;*:23162:localhost&quot; /&gt;
                    &lt;/bindings&gt;
                &lt;/site&gt;
                &lt;siteDefaults&gt;
                    &lt;logFile logFormat=&quot;W3C&quot; directory=&quot;%IIS_USER_HOME%\Logs&quot; /&gt;
                    &lt;traceFailedRequestsLogging directory=&quot;%IIS_USER_HOME%\TraceLogFiles&quot; enabled=&quot;true&quot; maxLogFileSizeKB=&quot;1024&quot; /&gt;
                &lt;/siteDefaults&gt;
                &lt;applicationDefaults applicationPool=&quot;Clr4IntegratedAppPool&quot; /&gt;


I wish there was a tag for `really-stuck`.

Please suggest away, as I don&#39;t want to go as far as spinning up a new server.


**-- UPDATE --**

In the URL bar, when I enter the computer name or IP address :xxxx I get the `ERR_CONNECTION_TIMED_OUT` rather than `ERR_CONNECTION_REFUSED`.




  [1]: https://stackoverflow.com/questions/15584862/iis-express-not-working-in-visual-studio-2012
  [2]: http://i.stack.imgur.com/5JEJu.png

How to solve ERR_CONNECTION_REFUSED when trying to connect to localhost running IISExpress - Error 502 (Cannot debug from Visual Studio)?

I recently renamed my root TFS folder from `D:\TFS\systemstfs` to `D:\TFS\sys` because one of the project&#39;s paths was too long for Windows. Now, when I attempt to run a different project (D:\TFS\sys\companydomain.com\Dev\Flowers\wsBusinessLayer) in VS2013 using IIS Express (Project URL http://localhost:59729/Flowers/wsBusinessLayer/) I get the following error message in the browser:

&gt; HTTP Error 500.19 - Internal Server Error  
The requested page cannot be accessed because the related configuration data for the page is invalid.

&gt; Module - IIS Web Core  
Notification - BeginRequest  
Error Code - 0x80070003  
Config Error - Cannot read configuration file  
Config File - \\?\D:\TFS\\**systemstfs**\companydomain.com\Dev\Flowers\web.config  
Requested URL - http://localhost:59729/Flowers/wsBusinessLayer/InformationServices.asmx  
Physical Path - D:\TFS\\**sys**\companydomain.com\Dev\Flowers\wsBusinessLayer\InformationServices.asmx

(emphasis mine, D: is the second HDD on my machine, not a network share)

It&#39;s clear to me what the problem is (the config file path is wrong) but I have no idea how to fix it. I have tried:

- Enabling &quot;break on CLR exceptions when thrown&quot;
- Re-getting the solution from TFS
- Rebooting
- Switching to use IIS and then back to Express
- Googling 500.19, 0x80070003, wrong path, cannot read configuration file, and various combinations of those terms

But have had no luck. Has anyone come across this before?

IIS Express - 500.19 Cannot read configuration file - because it&#39;s looking at the wrong path

I have copied my solution file from another system and tried to run it on my machine:
For this, I have gone to the project folder and deleted the previous solution file and copied the new one.

Now, it started giving me error. connection refused etc. So, I got one solution from here: https://stackoverflow.com/questions/32190881/how-to-solve-err-connection-refused-when-trying-to-connect-to-localhost-running

According to it, I changed the port number from 1049 to 1052. It loaded and one of the pages gets loaded.
But when I entered the desired login credentials then it redirected to the older port again, like this:

    http://localhost:1049/Home/SearchFlight

and the error is:

     This site can’t be reached

     localhost refused to connect.
     Search Google for localhost 1049 Home Search Flight
     ERR_CONNECTION_REFUSED

Now, I don&#39;t know what to do from here. I have changed the port number to 1052 but still its pointing to 1049. What should i do now?

localhost refused to connect Error in visual studio

If I attempt to launch my .net core app I get this message. I realize there are many posts out there claiming to fix this but I have tried every method they suggest and none are working. 

If I go into the project properties under debug and change the port, then it will connect 1 time. Then if I attempt to connect again, it will give me the same error again. I can then switch the port back to the original and it will load one time, then it will fail any time beyond that, until I switch it again. Anyone have any ideas or fixes they used?

Thanks!

Content Type	Original Author	Original Content on Stackoverflow
Question	David Gardiner	View Question on Stackoverflow
Solution 1 - asp.net	tugberk	View Answer on Stackoverflow
Solution 2 - asp.net	Edward Brey	View Answer on Stackoverflow

.vs\config\applicationhost.config in source control

asp.net Problem Overview

asp.net Solutions

Solution 1 - asp.net

Solution 2 - asp.net

App not setup: This app is still in development mode

How do Express and hapi compare to each other?

Attributions