Print to Printer From Crystal Report

Hi 2 all.

Can you help me resolve some problem.
I want to print report to my printer from Crystal Reports.
I generating reports pragmaticaly from C# program.
And I want to set a position of text object before it will been printed.

For example - i want to print on ticket template my FirstName and Lastname. And i want to set text object LastName pragmaticaly to position 10mm from top, and 50 mm from left.

But text object postiton can be sets by pixels (IMHO).
Can you help me to convert this position. To set = textObject.X = 10mm (for example)

P.S.
Sorry please for my bad English