Comments by CyrusT (Top 2 by date)

@Mehdi: I did what you said 100,000 times( in a for loop)
and yet the result had no difference :(

besides I tested a Queue<int>'s Enqueue() and Dequeue() methods too,and I noticed that the running time of these methods are even worse! (about 0.2 ms! ,again in a 100,000 times loop )