查询显示进度条

1、代码如下：
 1 <asp:UpdatePanel ID="up001" runat="server">
 2     <ContentTemplate>
 3         <table>
 4             <tr>
 5                 <td>
 6                     <asp:Button ID="btnOK" runat="server" Text="查询" OnClick="btnOK_Click" OnClientClick="document.getElementById('dialogBox').style.display='block';" />
 7                 </td>
 8                 <td>
 9                     <asp:UpdateProgress ID="prog" runat="server">
10                         <ProgressTemplate>
11                             </div>
12                             <div id="dialogBox" style="display: none;">
13                                 <div style="z-index: 999;  300px; position: absolute; left: 300px; top: 80px;
14                                     background: #FFFFFF; padding: 5px; border: 3px solid #999999;" id="dialogBoxBG">
15                                     <div style="cursor: pointer; float: right; background: #666666; color: #ffffff; padding: 2px;"
16                                         onclick="document.getElementById('dialogBox').style.display='none';">
17                                         Close</div>
18                                     <div>
19                                         <img src="http://www.cnblogs.com/../App_Themes/image/blue/loading.gif" />
20                                         请稍候，正在查询中
21                                     </div>
22                                 </div>
23                                 <div id="dialogBack" style="background: #000000 none repeat scroll 0% 0%; z-index: 998;
24                                     position: absolute; top: 0px; left: 0px; filter: alpha(opacity=20); opacity: 0.2;
25                                      100%; height: 100%;">
26                                 </div>
27                             </div>
28                         </ProgressTemplate>
29                     </asp:UpdateProgress>
30                 </td>
31                 <td>
32                     <asp:Label ID="lblTime" runat="server"></asp:Label>
33                 </td>
34             </tr>
35         </table>
36         <asp:GridView ID="gvShow" runat="server">
37         </asp:GridView>
38     </ContentTemplate>
39 </asp:UpdatePanel>
2、运行效果，如下：