Use of Microsoft's built-in Ajax

First downloadAspajaxextsetup,TheAjaxcontroltoolkit. dllPut inUIInBinFolder.Now you can use.

Asp : scriptmanager id =" scriptmanageruser " enablepagemethods =" true " runat =" server " />

<ASP:Updatepanel ID= "Updatepanel1" Runat= "Server"> <Contenttemplate>

Asynchronous refresh content

</Contenttemplate>

<Triggers>

< ASP : Asyncpostbacktrigger controlid =" button1 " eventname =" click " /> Asp : asyncpostbacktrigger controlid =" dropdownlist1 " eventname =" selectedindexchanged " />

<ASP:Asyncpostbacktrigger Controlid= "Checkbox1" Eventname= "Checkedchanged" />

</Triggers>

</ASP:Updatepanel>

//Note that the controlid is the ID of the trigger control, while the dropdownlist1 trigger is onselectedindexchanged = "dropdistrict_selectedindexchanged", and the trigger is the dropdistrict_selectedindexchanged segment in the running CS.

Oncheckedchanged = "checkbox#checkedchanged"After triggering, It is the checkbox‑checkedchanged block in the running CS.

Summary:EventnameYescontrolsClickPart,For exampleClick (Onclick);

Selectedindexchanged (Onselectedindexchanged);

Checkedchanged (Oncheckedchanged).