Need help in printing values from database

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C#

PostgreSQL

Hi all

I have to print data from database.
now i have to create a field called "printed" which is a Boolean value.like which ever line is printed it will change the status to "yes".

So once it is done printing first time, when we go for printing 2nd time, idea is it will check the "printed" column's last yes value, take the ID for that and start printing after giving that many line feeds.

e.g
First time i printed 3 lines, then next time while printing first it should give 3 line feeds and start printing from the 4th line.

Please tell me how to do this or if you have any other idea of doing this the tell me.

Thank you