Postback Events Sample The C1Accordion inside an UpdatePanel: Step 1 Step 1 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ac lacus ac nibh viverra faucibus. Mauris non vestibulum dui Step 2 Step 2 Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Vestibulum ante ipsum primis in faucibus. Step 3 Step 3 Sed facilisis placerat commodo. Nam odio dolor, viverra eu blandit in, hendrerit eu arcu. In hac habitasse platea dictumst. Step 4 Step 4 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ac lacus ac nibh viverra faucibus. Mauris non vestibulum dui. Server-side events: The C1Accordion outside of the UpdatePanel: Step 1 Step 1 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ac lacus ac nibh viverra faucibus. Mauris non vestibulum dui Step 2 Step 2 Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Vestibulum ante ipsum primis in faucibus. Step 3 Step 3 Sed facilisis placerat commodo. Nam odio dolor, viverra eu blandit in, hendrerit eu arcu. In hac habitasse platea dictumst. Step 4 Step 4 Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin ac lacus ac nibh viverra faucibus. Mauris non vestibulum dui. Server-side events: Description This sample demonstrates behavior of the C1Accordion control during full and partial page postback. The sample page consists of two accordion controls. The first accordion control is located inside an UpdatePanel, and its server-side SelectedIndexChanged event is set to "C1Accordion1_OnSelectedIndexChanged". The second accordion control is located outside of the UpdatePanel, and its server-side SelectedIndexChanged event is set to "C1Accordion2_OnSelectedIndexChanged". When the SelectedIndexChanged event handler is added, the C1Accordion posts back to the server each time the currently selected pane is changed. Note that if you wish execute post back without using the SelectedIndexChanged event, you can set the AutoPostBack property to True. Documentation