Draw a precision line...

Question

Does anyone know how to draw a line with decimal values?

This is what I am using to draw a line (snippet):

formGraphics.DrawLine(integer,integer,integer,integer) 

...which works just fine however, I need to use a decimal value but it will not take it only integer or Single type values.

I am trying to make my own Coordinate System, where the user enters two points and it draws a line.  I'm sure I can do this but this snippet I'm using will not allow decimal values.

-robert