Drawing in inches and feet

[davco1]

I am trying to make a drawing program that you can draw floor plans and the like with vb .net 2010.I know how to use gdi but I need to know how to draw lines that are scaled in inches and feet.Can anyone out there help me out with this problem?
I have tried the dpi x and y but it only gives me the resolution which is 96 dpi.
I seem to have gone brain dead trying to figure this out and it is probably as simple as can be.

[jmcilhinney]

Resolution and DPI are two different things. If the DPI is 96 then drawing 96 dots means that you've drawn an inch.

[davco1]

then inches would = line length /96?

[davco1]

Will this work to Scale this down to 1/4 inch = 1 foot
dim length as integer
length = dpix/48
I forgot to tell you that I am using vb .net 2010.