how to position controls absolutely in asp.net 2.0

Question

Hi All

I have designed a website using Master pages.When i include other pages I am not able to position  controls like text,label,gridview in absolute place inside content placeholder.The problem is when i place contols in a place at runtime it is positioned to another place at runtime.This makes my page look very odd.I have also included fieldset tag.I also tried aligning it using dreamweaver but it doesnot work.If anyone knows the solutuion for this kindly help.