I want to show only that items from list in dropdown2 which is assigned in data base if i select any list item from dropdown1
for example
if i have car and bus in dropdown1
and car category have ferrari, bmw,etc and bus have volvo , tata etc
then when i select car in dropdown1 it should show only ferrari, bmw etc item not bus items.
hope u got my problem.
plz help me to solve the problem

use the selectedindexchanged event of the first ddl. Grab the value, and use that as a paramether for a sql statment that you execute and retrieve the rows in the related table and bind to your second ddl.