Problem with creating looping table rows in

I need to create a form that has a dropdownlist as one of the components on it.  

If a user selects something from this dropdownlist however, I need to create a new row with another identical dropdownlist.  If the user then selects something from this one, then a third identical drop down should be displayed on the screen.  The user should theoretically have the option of displaying an infinate number of dropdownlists if they so choose.

How would I go about doing this?

Thanks in advance.

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I'd use a repeater, bound to an array, or any other datasource of your choosing.  When they add a new row you rebind the repeater, which will display a dropdownlist for each row of the datasource.

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