asp.net AJAX 代码实例。
<asp:UpdateProgress ID="UpdateProgress1" runat="server">
<ProgressTemplate>
<div id="PrograssGIF" style="position:absolute; z-index:1000;top:0px; right:158px">
<img src="Images/fire1.gif" />
</div>
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel ID="DetailUpdatePanel" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:GridView ID="GridView1" runat="server" OnSelectedIndexChanged="GridView1_SelectedIndexChanged" OnRowDataBound="GridView1_RowDataBound" CellPadding="3" ForeColor="#333333" GridLines="None" AutoGenerateColumns="False">
<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
<HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<AlternatingRowStyle BackColor="White" />
<Columns>
<asp:CommandField ButtonType="Button" ShowSelectButton="True"/>
<asp:BoundField DataField="Quarter" />
<asp:BoundField DataField="PC" />
<asp:BoundField DataField="Notebook" />
<asp:BoundField DataField="Software" />
<asp:BoundField DataField="Service" />
</Columns>
<FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
<RowStyle BackColor="#EFF3FB" HorizontalAlign="Center" />
<EditRowStyle BackColor="#2461BF" />
<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
</asp:GridView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="dpYear" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel3" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:CheckBoxList ID="cbCompareYear" runat="server" BackColor="#507CD1" RepeatLayout="Flow" Width="100%" RepeatDirection="Horizontal" Font-Bold="True" ForeColor="White">
</asp:CheckBoxList>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="dpYear" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
相关：http://www.cnblogs.com/gentlewolf/archive/2007/08/01/839333.html
http://blog.csdn.net/ccaakkee/archive/2007/12/07/1921751.aspx