Effects of Asynchronous Postback Requests

Listing 1. Here are the effects of an asynchronous postback request on multiple UpdatePanel controls.

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        UpdatePanel 1
        <br />
        <%= DateTime.Now %>
        <br />
        <asp:Button ID="Button1" runat="server" Text="Refresh" />
    </ContentTemplate>
</asp:UpdatePanel>

<asp:UpdatePanel ID="UpdatePanel2" runat="server">
    <ContentTemplate>
        UpdatePanel 2
        <br />
        <%= DateTime.Now %>
        <br />
        <asp:Button ID="Button2" runat="server" Text="Refresh" />
    </ContentTemplate>
</asp:UpdatePanel>