It sounds like you want to know the row in the database that corresponds to the first line in the file, and the second, and so on. To do that the only way is to set the batch size to 1. Here is a thread with a demo:
http://www.sqlservercentral.com/Forums/FindPost1127805.aspx
It makes use of an identity column to know to which line in the file each row corresponds.
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