如果你用google搜索它而不是张贴你就会很容易找到它。

试试这个链接 b $ b

基于其他下拉列表绑定下拉列表 [ ^ ]

i am asking a very basic question. i have a 1 dropdownlist for country name, 2nd dropdownlist for state will be visible only after selection of 1st drop down list and 2nd list show the state list based on country name according to 1st list as example
country name list having India, USA, nepal etc . if i select india than 2nd dropdown list display indian state, if select USA than display USA state name and so on. i hope question is clear.

If you have googled it rather posting you would have find it easily :)
Try this link

Bind dropdown based on other drop down[^]