Add new city onselect of 'Other' option in dropdown in asp.net
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i am implementing geo-location table using sql server, i have added major country, states and city in database, but want to give provision to add new country or city or state on select og OTHER option in drop down, and if i selected other in country, then same option should be selected in state and city dropdown and it should enable  textbox against that particular dropdown. I am using asp.net 3.5, database is sql server 2008 using linq. Please help!! 