asp.net-mvc

Can not connect to Sql database in C# asp mvc application with Entity Framework BUT the same code works with Winform application

by

First of all, please excuse me if it sounds too rooky. I consider myself novice in MVC applications.
I have ran into a strange problem and there does not seem to be any way out of this, at least so far..I have looked everywhere and left no stone unturned to get it worked. Finally I turned to this forum.
This is my first post, so any mistakes please overlook and guide me.

IIS 8.5 overriding custom JSON error response, instead returns the default 500 error response page. How can I get IIS 8.5 to return my custom error?

by

I’ve come across an annoying issue, which I think is being caused by IIS 8.5. With a web app that I’m creating, I have created a custom JSON HttpStatusResult class (which was an idea from this stackoverflow post), which enables me to return JSON along side a 500, 400 or other types of HTTP response status codes. Here is that code: