Windows Authentication and add Authorization Roles through database – MVC asp.net

I am new to mvc4 asp .net and confused with the authentication and authorization. Our’s is an internal website that takes username(HttpContext.Current.User.Identity.Name) from windows authentication and check against database if the username exists and what roles the user has. I want to use the global [Authorize] attribute and roles, to give access to controllers. Can anyone help me on how to start with.

Dealing with large file uploads on ASP.NET Core 1.0

When I’m uploading large files to my web api in ASP.NET Core, the runtime will load the file into memory before my function for processing and storing the upload is fired. With large uploads this becomes an issue as it is both slow and requires more memory. For previous versions of ASP.NET there are some articles on how to disable the buffering of requests, but I’m not able to find any information on how to do this with ASP.NET Core. Is it possible to disable the buffering of requests so I don’t run out of memory on my server all the time?

ASP.NET MVC – Alternative to Role Provider?

I’m trying to avoid the use of the Role Provider and Membership Provider since its way too clumsy in my opinion, and therefore I’m trying to making my own “version” which is less clumsy and more manageable/flexible. Now is my question.. is there an alternative to the Role Provider which is decent? (I know that I can do custom Role provier, membership provider etc.)

How to simplify my statefull interlaced modal dialogs in ASP.NET MVC

I need keep state on many-to-many modal dialogs in a progressive enhancement way in ASP.NET MVC project.
In my code when javascript is disabled modal dialog turn in navigation to another page and return, but when javascript is enabled the dialog open as a jquery modal dialog, its OK.
Im using this method to select action from click on view.
The code below show one master page calling detail page, there is the view and the controller. There is only one master calling one detail dialog but i have another views/controllers where one master can call many different detail dialog and sometimes one dialog can behave like a master page and call another dialog nested. Everything must keep state between calls.