public T GetNewValidObject()
        {
            if (numberOfInvalidObjects > 0)
            {
                return objects[--numberOfInvalidObjects];
            }
            else if (isWrappable)
            {
                numberOfInvalidObjects = objects.Length;
                return objects[--numberOfInvalidObjects];
            }

            return null;
        }

Decal decal = Game1.Instance.pool_Decal.GetNewValidObject();
                    int index = decals.IndexOf(decal);

                    if (index == -1)
                    {
                        decals.Add(decal);
                    }
                    else
                    {
                        decals[index] = decal;
                    }

        /// <summary>        /// Creates a new valid object to fill the spot of an invalidated        /// object if possible. Returns null if all objects are valid.        /// </summary>        /// <returns>A reference to the next valid object, or null if all space is being used.</returns>        public T GetNewValidObject()        {            if (numberOfInvalidObjects > 0)            {                // Reset the wrap index to oldest object when there are invalid (unused) objects                wrapIndex = objects.Length;                return objects[--numberOfInvalidObjects];            }            else if (isWrappable)            {                if (wrapIndex == 0)                {                    wrapIndex = objects.Length;                }                // Overwrite the oldest object in the pool if there are no free objects                return objects[--wrapIndex];            }            return null;        }