How to adjust auto height in my receipt

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C#4.0

I am creating windows application using c# 2010, my application connect a thermal printer but print receipt came good, but here i want how to control height auto adjust in my receipt. it means first receipt i am enter 10 rows take a print out and second receipt i am enter only one row - how to adjust paper height automatically.

Any one please guide me.

What I have tried:

How to adjust auto height in my receipt