This is an Integration Services sample to show how you can automatically increment values in a column, in the middle of a data flow (when ROW_NUMBER() cannot be used from Transact-SQL). C# and VB.NET code included.
This script is tested on these platforms by the author. It is likely to work on other platforms as well. If you try it and find that it works on another platform, please add a note to the script discussion to let others know.