In repeater, pay attention to the PostBack issue when you click the cursor to press the cursor event.

For repeater events, it is ineffective to deal with the time-based event in its iItem.
The onitemcommand event needs to be used.
However, there is a problem:
We usually set the repeater in the page_load event,
This is the first time the repeater will not be interrupted, but it is time-based.
The reason is that the cursor is refreshed after the cursor, And the repeater is modified again.
If the previous record does not exist, it cannot handle its events.
The solution is to leave the repeater undefined after the response surface is PostBack:
If (! Ispostback)
{
// Put the sequence set here
}

This problem is very important, but we often ignore it. >_<