how to dynamically cascading dropdownlist binding to database into gridview

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VB

SQL

hi guys,

i want to know how to dynamically adding cascading dropdownlist binding to database into gridview..the articles i found in internet almost are adding textbox.

for adding textbox i know.but how to adding cascading dropdownlist which is value is bind from database??

and lastly storing them to database.......?

lots of thanks,
musiw