Creating Dynamic control in oninit method

Hi All,
 
I have user registration form which is created dynamically depending upon id comming from previous page.
 
I have to store this id somewhere and want to retrive it in oninit method while postback.
 
I dont want to use Session or static veriable to store this id, so where should i stored it.
 
can any one help me out.

thanks in advance.