dynamic generate column dropdown problem

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SQL-Server-2005

ASP.NET

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hi friends
i have one dynamic grid view in this grid view two drop down box like state and city and one add button and one delete button when i click add button generate new dynamic column and when i click delete button one column are delete in grid view
and my problem is when i fill up record like state=> gujarat and city=> Ahmedabad and click add button and generate new column but city drop down are blank and i use update panel but thy are not working so nay one please give me a idea