Why session expired so fast in ASP.NET?

A lot of reasons, check following list for detail:

http://blogs.msdn.com/b/johan/archive/2007/05/16/common-reasons-why-your-application-pool-may-unexpectedly-recycle.aspx

How to update tables by inner join in SQL

update L
set l.Text ='something'
from [aTable] a
inner join [bTable] b on a.Id = b.aId
where a.id = 1

MVC , JsonResult , DateTime and TimeZone

http://msprogrammer.serviciipeweb.ro/2013/03/10/mvc-jsonresult-datetime-and-timezone/

How to read cookie value in ASP.NET MVC razor view?

@Request.Cookies["cookiename"].Value

@Response.Cookies["cookiename"].Value

ASP.NET Web API REST Security Basic

http://www.jamiekurtz.com/2013/01/14/asp-net-web-api-security-basics/