Brother in ASP. NET wants to drop down the list box and want to raise an event when clicking on an option, please give p

1区卡扎克lm

Brother in ASP. NET wants to drop down the list box and want to raise an event when clicking on an option, please give pointers, thank you!

疾风劲草

AutoPostBack = true;
Isn't it possible to raise an event in the SelectedIndexChanged event?

1区卡扎克lm

AutoPostBack = true
I forgot to use this property, I will try again, thanks

水蓝的牧师

Right-click on the drop-down list box and hook AutoPostBack
Double click on the drop-down list box to write the code in the event it is OK to pull.
The code is to connect to the corresponding database and you can pull

1区卡扎克lm

Why is it only the first time, the next time, it will not work

zhouyin1981

Nope? Has your drop-down option not changed?

3521565

Why is it only the first time, the next time, it will not work

will not,
Look at the code

hope1226

Set AutoPostBack = true

saintfrosty

Q: Why is it only the first time, and the next time, it will not work

A: Because it is SelectedIndexChanged.

水蓝的牧师

You bind what you previously bound here once