How to set application/ form size according to resolution of screen

Question

Hi
In my application I have to set Form size 1024*768  if resolution is 1024*768. I did it by setting size property of form.

But if resolution is 2048*768 then i have to show my complete form on 1024*768  left side of screen and form2 on Right half part of screen.

I got system resolution  and tried to set size property of form to show according, but its not working...

Please can anyone help me for this.
Thanks