i have a radgrid and an asp button which loads the data to the radgrid from the database, i want to display a waiting icon until the server response with the data to fill the grid, i am trying this and it doesn't display anything:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="testloadingpage.aspx.cs" Inherits="testloadingpage" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<
html
xmlns
=
"http://www.w3.org/1999/xhtml"
dir
=
"rtl"
>
<
head
id
=
"Head1"
runat
=
"server"
>
<
link
rel
=
"stylesheet"
type
=
"text/css"
href
=
"css/Style.css"
media
=
"screen"
/>
<
title
>mailing lists</
title
>
</
head
>
<
body
>
<
form
id
=
"form1"
runat
=
"server"
>
<
telerik:RadScriptManager
ID
=
"RadScriptManager1"
runat
=
"server"
>
</
telerik:RadScriptManager
>
<
telerik:RadAjaxManager
ID
=
"RadAjaxManager1"
runat
=
"server"
>
<
AjaxSettings
>
<
telerik:AjaxSetting
AjaxControlID
=
"Button1"
>
<
UpdatedControls
>
<
telerik:AjaxUpdatedControl
ControlID
=
"RadGridMailingList"
LoadingPanelID
=
"RadAjaxLoadingPanel1"
/>
</
UpdatedControls
>
</
telerik:AjaxSetting
>
<
telerik:AjaxSetting
AjaxControlID
=
"RadGridMailingList"
>
<
UpdatedControls
>
<
telerik:AjaxUpdatedControl
ControlID
=
"RadGridMailingList"
UpdatePanelHeight
=
""
LoadingPanelID
=
"RadAjaxLoadingPanel1"
/>
</
UpdatedControls
>
</
telerik:AjaxSetting
>
</
AjaxSettings
>
</
telerik:RadAjaxManager
>
<
div
id
=
"mailingList"
class
=
"contentBlock"
>
<
div
class
=
"submitButton"
>
<
asp:Button
ID
=
"Button1"
runat
=
"server"
Text
=
"run query"
OnClick
=
"Button1_Click"
/>
</
div
>
<!-- content start -->
<
telerik:RadAjaxLoadingPanel
ID
=
"RadAjaxLoadingPanel1"
runat
=
"server"
/>
<
telerik:RadGrid
ID
=
"RadGridMailingList"
Width
=
"97%"
AllowSorting
=
"True"
PageSize
=
"15"
AllowPaging
=
"True"
runat
=
"server"
ShowStatusBar
=
"True"
GridLines
=
"Vertical"
OnNeedDataSource
=
"RadGrid1_NeedDataSource"
>
<
MasterTableView
CommandItemDisplay
=
"Top"
>
</
MasterTableView
>
</
telerik:RadGrid
>
</
div
>
<!-- content end -->
</
form
>
</
body
>
</
html
>