how to Manipulate more than one placeholder in Asp.net page

Hi,
I want to manipulate more than one place holder in Asp.net page.
in that place holder i want create noof textboxes, dropdown list dynamicaly and it will get the data & store to different database.
how to create it, help me.
i am using Visual studio-2005, Asp.net with C# coding.
Ms-Access as Database.
--Ursgj.