public void Refuse(int id)
        {
            Convention convention = ConventionContext.GetOneById(id);

            convention.Status = "refused";

            ConventionContext.Update(convention);

            EmailController.Refuse(id);
        }
        public void Accept(int id)
        {
            Convention convention = ConventionContext.GetOneById(id);

            convention.Status = "accept";

            ConventionContext.Update(convention);

            EmailController.Accept(id);
        }