ASP. NET Ajax has two types of triggers

In ASP. net Ajax has two types of triggers: asyncpostbacktrigger and postbacktrigger. asyncpostbacktrigge is used to specify a server-side control and use the triggered server-side events as the asynchronous update trigger of the updatepanel, the property that needs to be set includes the Control ID and the event of the server control. postbacktrigger is used to specify a Server Control in updatepanel. asynchronous sending is not used for the return, it is still a traditional whole-page delivery. This is very different from Atlas. Let's look at a small example. Although both buttons are placed in updatepanel, button2 is still used because it is specified in postbacktrigger.