public MemoryCacheInstanceStore(InstanceLifetimeOptions lifetimeOptions)
        {
            if (lifetimeOptions == null)
            {
                throw new ArgumentNullException("lifetimeOptions");
            }

            this.lifetimeOptions = lifetimeOptions;
        }
        public MemoryCacheInstanceStore(InstanceLifetimeOptions lifetimeOptions)
        {
            if (lifetimeOptions == null)
            {
                throw new ArgumentNullException("lifetimeOptions");
            }

            this.lifetimeOptions = lifetimeOptions;
        }