problem with maintaining data in dynamically created table with controls

I have a table that is being populated on the click of a button.

My problem is that when there is a postback, the data from this table disappears, the table itself however is still visible.

 The data in the table consists of: each row has a cell with a lbl and a cell with a dropdownlist

 

Any ideas how i can keep the dynamic data after postback.

 

thank you
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