用Js代码代替点击按钮操作来Post数据到服务器端

JS:
__doPostBack('btnSearch','');

HTML:
<input type="button" id="btnSearch" runat="server" style="visibility:hidden; position: absolute;" onserverclick="btnSearch_Click" />   

如果加入Ajax功能：
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <ContentTemplate>
            //HTML代码......
        </ContentTemplate>
                <Triggers>
                    <asp:AsyncPostBackTrigger ControlID="btnSearch" EventName="ServerClick" />
                </Triggers>
            </asp:UpdatePanel>

可以处理Ajax提示效果：
<script language="javascript" type="text/javascript">
        <!--
            var prm = Sys.WebForms.PageRequestManager.getInstance();
            prm.add_initializeRequest(InitializeRequest);
            prm.add_endRequest(EndRequest);
            var postBackElement;
            function InitializeRequest(sender, args) {
                postBackElement = args.get_postBackElement();
            }
            function EndRequest(sender, args) {
                if( postBackElement.id == "btnSearch")
                {                  
                    $("divWait").style.visibility = "hidden";
                    $("btnSave").disabled = "";
                    $("btnHidden").disabled = "";                                                       
                }
            }
        // -->
        </script>