How to not list users which have Admin role - Asp.Net MVC 5

Question

In my table i have two columns Email_ID & Role , for example (Email_ID : [email protected] & Role : Admin) and what I'am trying to do is avoid or not showing the users or those have Role as Admin , but the code i have now is showing all users. 

 

 My Code look like this : 

public ActionResult AllEmails(string searching, int? pageNumber)
       {

return View(db.PX.Where(x => x.Email_ID.Contains(searching) ||
searching == null).ToList().OrderBy(t => t.Role).ToPagedList(pageNumber ?? 1, 5));



   }