How to enable roles in MVC?? my code is given below and I don't know how to create roles and I want to add it to the database..

[AttributeUsage(AttributeTargets.All)]
    public class UserRightAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            //write your user right logic
            //if user has right to do nothig otherwise redirect to error page.
            string message = "It seems You  are not authorize to view this part of the web site!!!.";
            RouteValueDictionary redirectTargetDictionary = new RouteValueDictionary();
            redirectTargetDictionary.Add("area", "");
            redirectTargetDictionary.Add("action", "SaveData");
            redirectTargetDictionary.Add("controller", "Home");
            redirectTargetDictionary.Add("customMessage", message);
            filterContext.Result = new RedirectToRouteResult(redirectTargetDictionary);
        }
    }