How does Ajax refresh another updatepanel (Asp.net C #) in one updatepanel #)

On the page (. aspx)
<Asp: updatepanel id = "myid1" runat = "server" childrenastriggers = "false" updatemode = "Conditional">
<Contenttemplate>
// HTML content
</Contenttemplate>
</ASP: updatepanel>
<Asp: updatepanel id = "myid1" runat = "server">
<Contenttemplate>
<Asp: button id = "aaaa" runat = "server" onclick = "aaaa_click"/>
</Contenttemplate>
</ASP: updatepanel>

In the background (. CS)
Write in aaaa_click () event
{
Myid. Update (); // when you click the button (aaaa), the HTML content in myid is refreshed in the background.
}

Similarly, the button in myid1 can refresh the HTML in myid2. You only need to add childrenastriggers = "false" updatemode = "Conditional" to myid2"