please kindly help

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I designed an expert which will execute up to some dozens of orders at the same time, all of which are the same type, same price, etc.. and all these orders are sent in ONE while statement. I wonder what will happen if the price changes during the iteration in the while statement. Will the OrderSend() fail? Or will the order be succeessfully executed by the server at the new price, given that I set up a slippage value of 99 or sth big enough. And what kind of relation between all this and the concept of Price Thread? Thank you so much.
 
May this article will help you - "MQL4: Considering Orders in a Large Program"
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