public JsonResult InviteUsers(string email, string roles)
{
Ctx ct = Session["ctx"] as Ctx;
CreateUser model = new CreateUser(ct);
List <RolesInfo> infos = JsonConvert.DeserializeObject <List <RolesInfo> >(roles);
return(Json(JsonConvert.SerializeObject(model.InviteUsers(email, infos)), JsonRequestBehavior.AllowGet));
}