Session management in global.asax (custom session check)

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C#5.0

ASP.NET4

MVC5

I need to manage session through global.asax file because I dont want to write a session check method for every page, I want all the request by default should be validated from global.asax. I need to check my custom session in session_start to see valid user. I am using outproc (state server) for storing session.

I tried the code but after checking the session it doent check the session for the next load, I have below scenario.

1) Open any URL (If session fails it should redirect to login page)
2) After landing on Login page I change the URL in address bar and for this time code doesnt come to session_start to check valid session.

What I have tried:

protected void Session_Start(object sender, EventArgs e)
        {
            try
            {
                if (HttpContext.Current.Session["clientinfo]!=null))
                {

                }
                else
                {
                    //FormsAuthentication.SignOut();
                    //HttpContext.Current.Session.Abandon();
                    Response.Redirect("some page");
                }

            }
            catch
            {
            }
        }