PoolManager.cs

public static class PoolManager
    {
        private const int initialItems = 10;

        private static Dictionary<Type, Queue<object>> pools;
        public static T Get<T>() where T : class, new()
        {
            if (!pools.ContainsKey(typeof(T)))
            {
                pools[typeof(T)] = new Queue<T>() as Queue<object>;
                for (int i = 0; i < initialItems; i++)
                {
                    pools[typeof(T)].Enqueue(new T());
                }
            }
            return pools[typeof(T)].Dequeue() as T;
        }

        public static void ReEnqueue(object item)
        {
            pools[item.GetType()].Enqueue(item);
        }
    }