One approach I can think of is,
you create
public class RoleManagerFilter : ActionFilterAttribute
and in this class you add, following function
void IActionFilter.OnActionExecuting(ActionExecutingContext filterContext)
the above function will check the role from session(assuming its in session) and then accordingly filter the data for Employee Type
here is the msdn link for the theory behind it.
http://msdn.microsoft.com/en-us/library/dd410056%28v=vs.100%29.aspx