i am using 3 dropdownlists namely state, city,zip. Once we select "state" dropdown list ,that state contained "cityes" are displayed.and "cityes" dropdown list selected that city contained "zip" values are displayed.Once we selected state in state dropdownlist,that state contained cyties are displayed at cities dropdownlist. then we want to select another state again we select another state at that time state dropdown box display doplicate values. The duplicate values are comming in run time. how will over come from this duplicated values in drop down list. please help me...
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