VS 2010 Calculate no. of columns and rows that can be drawn on an PrintDocument

Hello!

I need to print barcode labels, and for the same i need to calculate the max no. of columns and rows that would fit within the MarginBounds of the PrintDocument.

Yes i could simply divide the PageWidth with the width of the Label, but after every column(and row) i need to give an margin of 0.15 inches (my PageUnits are Inches).

How should i include this margin in the calculation to get the max no. of rows and columns that would fit in the page.

Thanks
Regards
Aashish Agarwal