How to get active users in last 10 minutes in ASP.NET membership database?

select top 300 * from dbo.aspnet_Users u
where u.LastActivityDate > DATEADD(minute, -10, GETUTCDATE())
order by u.LastActivityDate desc

How to fix problem: missing files when publish a website in Visual Studio for ASP.NET?

In Visual Studiio, Content files need to be marked for publishing
Right click on the file missed -> Properties -> Build Action set to Content.

How to find common items in two set of items in C#?

            var list1 = new List() { 1, 3, 4, 5 };
            var list2 = new List() { 2, 3, 4, 5 };
            var commonItems = list1.Intersect(list2);

OAuth with ASP.NET MVC and WorldDomination.Web.Authentication

http://www.philliphaydon.com/2013/02/oauth-with-asp-net-mvc-and-world-domination-authentication/

MVC 4: facebook twitter login with oAuth

http://www.dotnetexpertguide.com/2012/08/facebook-twitter-oauth-openid-login-with-aspnet-mvc-4-application.html