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Hello I am trying to show a Loading Image before loading a Report Viewer in a button click . But Its not working . Please help .
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
<AjaxSettings>
<telerik:AjaxSetting AjaxControlID="rcbSearchHierarchy">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="pnlAssetHierarchy" LoadingPanelID="Loadingpnl"></telerik:AjaxUpdatedControl>
</UpdatedControls>
</telerik:AjaxSetting>
<telerik:AjaxSetting AjaxControlID="btnViewReport">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="rptVr" LoadingPanelID="Loadingpnl"></telerik:AjaxUpdatedControl>
</UpdatedControls>
</telerik:AjaxSetting>
</AjaxSettings>
</telerik:RadAjaxManager>
<telerik:RadDockLayout runat="server" ID="RadDockLayout1">
<telerik:RadDockZone runat="server" ID="RadDockZone1" Width="99%" Skin="Vista"
FitDocks="false" BorderWidth="0px">
<telerik:RadDock runat="server" ID="RadDock1" Title="Report Criteria"
DefaultCommands="ExpandCollapse" Width="100%" EnableDrag="False" Skin="Vista"
DockMode="Docked" EnableRoundedCorners="false">
<ContentTemplate>
<telerik:RadAjaxLoadingPanel ID="Loadingpnl" runat="server" Transparency="1">
<asp:Image ID="LoadingImage" runat="server" ImageUrl="~/Images/Loading.gif"></asp:Image>
</telerik:RadAjaxLoadingPanel>
<%-- <asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>--%>
<table width="100%">
<tr>
<td>
<asp:Panel ID="pnlAssetHierarchy" runat="server">
<%--<ContentTemplate>--%>
<uc1:AssetHierarchy runat="server" ID="AssetHierarchy" prmpage="4"/>
<%--</ContentTemplate>--%>
</asp:Panel>
</td>
</tr>
<tr>
<td>
<table cellpadding="0" cellspacing="0" width="100%">
<tr class="TableCont">
<th align="left"></th>
</tr>
<tr>
<td style="height: 24px">
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:RadioButtonList ID="rblDataRange" runat="server" onClick="DateRangeOptionSelection();"
RepeatDirection="Horizontal" TabIndex="8" CssClass="rbl" OnSelectedIndexChanged="rblDataRange_SelectedIndexChanged">
<asp:ListItem Selected="True" Value="1">YTD </asp:ListItem>
<asp:ListItem Value="2">Today</asp:ListItem>
<asp:ListItem Value="3">Date Range</asp:ListItem>
</asp:RadioButtonList>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td id="tdDateRange">
<asp:Panel ID="pnlDateRange" runat="server">
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<uc1:DatePicker runat="server" ID="DatePicker" />
</ContentTemplate>
</asp:UpdatePanel>
</asp:Panel>
</tr>
<tr>
<td>
<table style="width: 90px; font-family: sans-serif; font-size: small">
<tr>
<td>
<asp:Button ID="btnViewReport" runat="server" Text=" View Report " Width="85px" OnClick="btnViewReport_Click" />
</td>
<td></td>
<td>
<telerik:RadButton ID="btnReset" runat="server" Text=" Reset " Width="85px" OnClick="btnReset_Click"></telerik:RadButton>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
<%-- </ContentTemplate>
</asp:UpdatePanel>--%>
</ContentTemplate>
</telerik:RadDock>
</telerik:RadDockZone>
</telerik:RadDockLayout>
</td>
</tr>
<tr style="height:95%">
<td>
<%-- <asp:UpdatePanel runat="server">
<ContentTemplate>--%>
<rsweb:ReportViewer ID="rptVr" runat="server" Width="100%" Visible="False" ></rsweb:ReportViewer>
<%-- </ContentTemplate>
</asp:UpdatePanel>--%>
</td>
</tr>
</table>
</asp:Content>
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
<AjaxSettings>
<telerik:AjaxSetting AjaxControlID="rcbSearchHierarchy">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="pnlAssetHierarchy" LoadingPanelID="Loadingpnl"></telerik:AjaxUpdatedControl>
</UpdatedControls>
</telerik:AjaxSetting>
<telerik:AjaxSetting AjaxControlID="btnViewReport">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="rptVr" LoadingPanelID="Loadingpnl"></telerik:AjaxUpdatedControl>
</UpdatedControls>
</telerik:AjaxSetting>
</AjaxSettings>
</telerik:RadAjaxManager>
<telerik:RadDockLayout runat="server" ID="RadDockLayout1">
<telerik:RadDockZone runat="server" ID="RadDockZone1" Width="99%" Skin="Vista"
FitDocks="false" BorderWidth="0px">
<telerik:RadDock runat="server" ID="RadDock1" Title="Report Criteria"
DefaultCommands="ExpandCollapse" Width="100%" EnableDrag="False" Skin="Vista"
DockMode="Docked" EnableRoundedCorners="false">
<ContentTemplate>
<telerik:RadAjaxLoadingPanel ID="Loadingpnl" runat="server" Transparency="1">
<asp:Image ID="LoadingImage" runat="server" ImageUrl="~/Images/Loading.gif"></asp:Image>
</telerik:RadAjaxLoadingPanel>
<%-- <asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>--%>
<table width="100%">
<tr>
<td>
<asp:Panel ID="pnlAssetHierarchy" runat="server">
<%--<ContentTemplate>--%>
<uc1:AssetHierarchy runat="server" ID="AssetHierarchy" prmpage="4"/>
<%--</ContentTemplate>--%>
</asp:Panel>
</td>
</tr>
<tr>
<td>
<table cellpadding="0" cellspacing="0" width="100%">
<tr class="TableCont">
<th align="left"></th>
</tr>
<tr>
<td style="height: 24px">
<asp:UpdatePanel ID="UpdatePanel2" runat="server">
<ContentTemplate>
<asp:RadioButtonList ID="rblDataRange" runat="server" onClick="DateRangeOptionSelection();"
RepeatDirection="Horizontal" TabIndex="8" CssClass="rbl" OnSelectedIndexChanged="rblDataRange_SelectedIndexChanged">
<asp:ListItem Selected="True" Value="1">YTD </asp:ListItem>
<asp:ListItem Value="2">Today</asp:ListItem>
<asp:ListItem Value="3">Date Range</asp:ListItem>
</asp:RadioButtonList>
</ContentTemplate>
</asp:UpdatePanel>
</td>
</tr>
<tr>
<td id="tdDateRange">
<asp:Panel ID="pnlDateRange" runat="server">
<asp:UpdatePanel ID="UpdatePanel3" runat="server">
<ContentTemplate>
<uc1:DatePicker runat="server" ID="DatePicker" />
</ContentTemplate>
</asp:UpdatePanel>
</asp:Panel>
</tr>
<tr>
<td>
<table style="width: 90px; font-family: sans-serif; font-size: small">
<tr>
<td>
<asp:Button ID="btnViewReport" runat="server" Text=" View Report " Width="85px" OnClick="btnViewReport_Click" />
</td>
<td></td>
<td>
<telerik:RadButton ID="btnReset" runat="server" Text=" Reset " Width="85px" OnClick="btnReset_Click"></telerik:RadButton>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
<%-- </ContentTemplate>
</asp:UpdatePanel>--%>
</ContentTemplate>
</telerik:RadDock>
</telerik:RadDockZone>
</telerik:RadDockLayout>
</td>
</tr>
<tr style="height:95%">
<td>
<%-- <asp:UpdatePanel runat="server">
<ContentTemplate>--%>
<rsweb:ReportViewer ID="rptVr" runat="server" Width="100%" Visible="False" ></rsweb:ReportViewer>
<%-- </ContentTemplate>
</asp:UpdatePanel>--%>
</td>
</tr>
</table>
</asp:Content>