Transferring DropDownList values from one page to the next

Question

I have 2 pages, both with 3 similar DropDownLists. The first DropDownList needs to be populated before selecting the second, and the second before the third (which then populate

Answer 1

If you have the form where the button that the users click post to the second page, the second page can look for the values of the DDL and set them on page load.