Setting width and Height in percent(%)

Question

Hi,

I have a Project in Asp.net which have approximate 120 forms. Each of them have multiple controls as Table, Textbox, Dropdown,ListBox,Gridview..nd so on with different different name. I have set the width and Height of all controls as Pixel(px). But now i want to change width and Height in percent(%) of all controls. So there is any quick solution for it or i will have to change one by one controls.

If there is any solution so please help me.

Thanks
 
Pankaj