Cancel check and withdraw petition at same time?

I have filed a B2 petition several days ago. In order to withdraw the petition, I cancelled the check before USCIS cash it. Now I received the receipt notice. My questions is whether I need to write a withdrawal letter to USCIS? If I do, is there any harm/confliction(since I have cancelled the check).

Thanks.

所有跟帖： 

• 回复：Cancel check and withdraw petition at same time? -doshexh- ♀ (67 bytes) () 07/14/2006 postreply 06:56:33

• 回复：回复：Cancel check and withdraw petition at same time? -msnbc- ♀ (321 bytes) () 07/14/2006 postreply 07:40:46