ASP.NET MVC: Action Filter to set up controller variables?

Question

I have a scenario whereby with every page request I must check the session of the presence of a particular ID. If this is found I must grab a related object from the database an

Answer 1

Create a base controller like this

   public class MyContollerController : Controller
    {
        public DataEntity userData;
        protected override void Initialize(System.Web.Routing.RequestContext requestContext)
        {            
            base.Initialize(requestContext);
            var customId = requestContext.HttpContext.Session["key"];
            if(customId!=null)
            {
                 userData=getDataGromDataBase(customId);
            }   
            else
            {
               //redirect User
            }     
        }
    }

Now Create ur controllers like this

public class MyDemoController : MyContollerController
{
        public ActionResult Action1()
        { 
             //access your data
             this.userData

        }
        public ActionResult Action2()
        { 
             //access your data
             this.userData

        }
}