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Unable to access the gridview present inside the RadMultiPage

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Rajesh asked on 10 Jan 2013, 03:31 PM

Hi There,
I am unable to access the gridview present inside the RadMultiPage control in my C# code.I am having this issue in PageIndexChanging event.I have attached my code for your reference.

ASPX:

<div>

<div class="text">

<img alt="Dashboard" class="text" src="images/module/iReport.png" width="30" height="30" />Special

Reports

</div>

<telerik:RadWindowManager ID="RadWindowManager1" Modal="true" runat="server" Behaviors="Close,Maximize"

Skin="Vista" IconUrl="./images/module/PopUp_iCon.png" Height="500px" Width="600px">

</telerik:RadWindowManager>

<div class="pageContent">

<table border="0" cellpadding="0" cellspacing="5" width="100%">

<tr>

<td align="left" valign="middle">

<div>

<uc1:SpecialReportsMenu ID="SpecialReportsMenu1" runat="server" />

</div>

<table width="80%" border="0" cellspacing="0" cellpadding="0">

<tr>

<td width="13%" style="height:20px;">

</td>

<td width="50%">

</td>

<td width="17%">

</td>

</tr>

<tr>

<td class="formLeft" style="height:20px;">

Choose project :

</td>

<td class="formLeft">

<asp:DropDownList ID="ddlProjectID" runat="server" OnSelectedIndexChanged="ddlProjectID_SelectedIndexChanged"

CssClass="selectboxsize" AutoPostBack="True" class="selectboxsize" Width="250px">

</asp:DropDownList>

</td>

<td class="formRight">

<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="ddlProjectID"

SetFocusOnError="true" ErrorMessage="Please select Project ID" InitialValue="0"

ValidationGroup="VGRespondentData"></asp:RequiredFieldValidator>

</td>

</tr>

<tr>

<td class="formLeft" style="height:20px;">

Choose question :

</td>

<td class="formLeft">

<asp:DropDownList ID="ddlQuestion" runat="server" Width="250px" AutoPostBack="true"

OnSelectedIndexChanged="ddlQuestion_SelectedIndexChanged" CssClass="selectboxsize">

<asp:ListItem Value="-1">Choose</asp:ListItem>

</asp:DropDownList>

</td>

<td>

</td>

</tr>

<tr>

<td class="formLeft" style="height:20px;">

Selected question :

</td>

<td class="formLeft">

<asp:Label runat="server" ID="lblFulltxtquest" Text="" Width="100%"></asp:Label>

</td>

<td>

</td>

</tr>

<tr>

<td class="formLeft" style="height:20px;">

No.of responses :

</td>

<td class="formLeft">

<asp:Label runat="server" ID="lblResponse"></asp:Label>

</td>

<td>

</td>

</tr>

<tr id="tr1" runat="server">

<td>

</td>

<td align="center" style="padding-top: 5px">

<asp:Label ID="lblerror" runat="server" ForeColor="Red" CssClass="labeltext" Font-Bold="True"></asp:Label>

</td>

<td>

</td>

</tr>

</table>

</td>

</tr>

<tr>

<td>

<table id="tblRespData" runat="server" width="100%" border="0" cellspacing="0" cellpadding="0">

<tr>

<td align="center">

<asp:Label ID="lblMsgResData" runat="server" CssClass="labeltext" Text="Label" Visible="false"></asp:Label>

</td>

</tr>

<tr>

<td>

<table width="100%" border="0" cellpadding="0" cellspacing="0">

<tr id="trComFilter" runat="server">

<td align="left">

<table width="100%" id="tblMapView" runat="server">

<tr>

<td align="right">

<asp:UpdateProgress ID="updProgress" AssociatedUpdatePanelID="" runat="server">

<ProgressTemplate>

<table>

<tr>

<td style="width: 50px; background-color: Red;">

<asp:Label ID="lblProcessResp" ForeColor="White" BorderColor="red" Text="Loading..."

runat="server"></asp:Label>

</td>

</tr>

</table>

</ProgressTemplate>

</asp:UpdateProgress>

</td>

</tr>

<tr>

<td>

<table width="100%" border="0" cellpadding="0" cellspacing="0">

<tr style="width: 40px">

<td>

<telerik:RadTabStrip ID="rtabstripChart" runat="server" MultiPageID="radMultiPg"

SelectedIndex="0" Width="227px">

<Tabs>

<telerik:RadTab Text="Heat Map" CssClass="labeltext">

</telerik:RadTab>

<telerik:RadTab Text="Individual Images" CssClass="labeltext">

</telerik:RadTab>

</Tabs>

</telerik:RadTabStrip>

<telerik:RadMultiPage ID="radMultiPg" runat="server" SelectedIndex="0">

<telerik:RadPageView ID="radHeatMap" runat="server">

<div>

<table width="100%" border="0">

<tr>

<td width="50%" align="left" class="formLeft" style="padding-left: 100px; padding-top: 10px">

Heat map of Green selection

</td>

<td width="50%" align="left" class="formLeft" style="padding-left: 100px; padding-top: 10px">

Heat map of Red selection

</td>

</tr>

<tr style="height: 100px;">

<td align="left" runat="server" id="tdDispArea" valign="top" width="60%">

<table><tr><td class="ImageFix">

<div id="divBackCombinedfront" runat="server" class="Redtransparent">

</div>

<asp:Image runat="server" ID="divBackCombinedbottom" class="Redtransparent" />

<div id="divBackCombinedtop" runat="server" class="OriginalImage">

</div>

</td></tr></table>

</td>

<td align="left" runat="server" id="tdDispArea_Red" valign="top" width="40%">

<table><tr><td class="ImageFix">

<div id="divBackCombinedtop_Red" runat="server" class="Redtransparent">

</div>

<asp:Image runat="server" ID="divBackCombinedbottom_Red" class="Redtransparent" />

<div id="divBackCombinedfront_Red" runat="server" class="OriginalImage">

</div>

</td></tr></table>

</td>

</tr>

<tr>

<td style="height: 5px;">

</td>

</tr>

<tr>

<td colspan="2" valign="bottom">

<div style="width: 280px; height: 38px; text-align: center; vertical-align: middle;

padding-left: 13px;">

<div style="width: 280px; float: left" runat="server" id="divCommonPalete">

<div style="width: 280px; padding-top: 3px">

<span style="width: 85px; display: block; float: left; text-align: left" class="formLeft">

high</span> <span style="width: 85px; display: block; float: left; text-align: center;

font-family: Arial, Helvetica, sans-serif; font-size: 12px" class="formCenter">medium</span>

<span style="width: 80px; display: block; float: left; text-align: right" class="formRight">

low</span>

</div>

<div style="height: 20px">

</div>

<div style="width: 256px">

<asp:Image ID="imgPallete3" runat="server" ImageUrl="~/images/module/pallete.bmp" Height="5px"

Width="256px" />

</div>

</td>

</tr>

</table>

</div>

</telerik:RadPageView>

<telerik:RadPageView ID="radIndividuals" runat="server">

<div>

<asp:Panel ID="pnlGV" runat="server" ScrollBars="Auto">

<asp:Repeater ID="rptrQuestion" runat="server" OnItemDataBound="rptrQuestion_ItemDataBound">

<ItemTemplate>

<table width="100%" border="0">

<tr>

<td class="formLeft">

<asp:Label ID="lblQuesttxt" runat="server" Visible="false"></asp:Label>

</td>

<td align="right" style="width: 80px; padding-right: 15px" valign="top" class="labeltext">

<asp:LinkButton ID="lnkBtnViewFile" Text="View file" CssClass="labeltext" runat="server"

Visible="false" CommandArgument='<%#Eval("Path")%>' CommandName="View file"></asp:LinkButton>

</td>

</tr>

<tr>

<td colspan="2">

</td>

</tr>

<tr>

<td colspan="2" align="left">

<table width="390px" border="0" cellpadding="0" cellspacing="0" class="tablebg">

<tr>

<td align="center">

<table width="390px" cellpadding="0" cellspacing="0" border="0" class="tablemain">

<td>

<asp:GridView ID="GVRespondentData" runat="server" EnableViewState="true" Width="390px"

AutoGenerateColumns="False" GridLines="None" OnRowDataBound="GVRespondentData_RowDataBound" AllowPaging="True" PageSize="2" OnPageIndexChanging="GVRespondentData_PageIndexChanging" >

<Columns>

<asp:BoundField DataField="PaM_Id" HeaderText="RespondentID" HeaderStyle-Width="130px"

ItemStyle-Width="120px">

<ItemStyle Font-Bold="True" Font-Size="8pt" HorizontalAlign="Center" />

</asp:BoundField>

<asp:BoundField DataField="Response_ID" HeaderText="ResponseID" HeaderStyle-Width="130px"

ItemStyle-Width="120px">

<ItemStyle Font-Bold="True" Font-Size="8pt" HorizontalAlign="Center" />

</asp:BoundField>

<asp:BoundField DataField="WebApp_Id" HeaderText="WebAppID" Visible="false">

<ItemStyle Font-Bold="True" Font-Size="8pt" HorizontalAlign="Center" />

</asp:BoundField>

<asp:TemplateField HeaderText="View map" HeaderStyle-Width="130px" ItemStyle-Width="130px">

<ItemTemplate>

<asp:LinkButton ID="lnkBtnViewMap" CssClass="labeltext" Text="View map" runat="server"

CommandArgument='<%#Eval("Ans_Id")%>' ></asp:LinkButton>

</ItemTemplate>

<ItemStyle HorizontalAlign="Center" />

</asp:TemplateField>

<asp:BoundField DataField="Ans_Id" />

</Columns>

<PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />

<SelectedRowStyle />

<HeaderStyle CssClass="tdheader" HorizontalAlign="Center" Height="30px" />

<RowStyle CssClass="tdfirst" />

<AlternatingRowStyle CssClass="tdsecond" />

<EmptyDataTemplate>

No response found.

</EmptyDataTemplate>

</asp:GridView>

</td>

</table>

</td>

</tr>

</table>

</td>

</tr>

</table>

</ItemTemplate>

</asp:Repeater>

</asp:Panel>

<asp:Label ID="lblNoData" Text="No data found." runat="server" Visible="False" Font-Size="9pt"

ForeColor="#FF3300"></asp:Label></div>

</telerik:RadPageView>

</telerik:RadMultiPage>

</td>

</tr>

</table>

</td>

</tr>

<tr>

<td>

<table width="100%" border="0" cellpadding="0" cellspacing="0">

<tr style="width: 40px">

<td>

</td>

</tr>

<tr id="trRespData" runat="server">

<td align="center" style="padding-top: 20px">

</td>

</tr>

</table>

</td>

</tr>

</table>

</td>

</tr>

</table>

</td>

</tr>

<tr>

<td style="height: 5px">

</td>

</tr>

</table>

</td>

</tr>

</table>

</div>

<div runat="server" id="divContainer" style="position: absolute; display: none;">

<div style="color: Red; float: right; font-size: 9pt; cursor: hand;" onclick="hideViewFile();">

[X]</div>

<img runat="server" id="imgViewFile" src="" alt="Background Image" />

</div>

CS:

protected void GVRespondentData_PageIndexChanging(object sender, GridViewPageEventArgs e)

{

GridView GVRespondentData = radMultiPg.FindControl("radIndividuals").FindControl("pnlGV").FindControl("rptrQuestion").FindControl("GVRespondentData") as GridView;

//GridView GVRespondentData = pnlGV.FindControl("ctl00_ContentPlaceHolder1_rptrQuestion_ctl00_GVRespondentData") as GridView;

GVRespondentData.PageIndex = e.NewPageIndex;

GVRespondentData.DataBind();

}

i am unable to access the gridview "GVRespondentData" directly and also using find control.I am getting the issue when i click on the page number of the grid.I am getting null when i did quick watch for the variable GVRespondentData.

Error Message:
"Object reference not set to an instance of an object."
Stack Trace:

" at iPinion.ControlPanel.Web.iPi_HeatMapRespondentData.GVRespondentData_PageIndexChanging(Object sender, GridViewPageEventArgs e) in E:\\WorkArea.Rajesh\\Projects\\Source\\Ipinion_New\\Source\\iPinion\\Ipinion_IAIntegration_Final\\iPinion.ControlPanel.Web\\iPi_HeatMapRespondentData.aspx.cs:line 229\r\n at System.Web.UI.WebControls.GridView.OnPageIndexChanging(GridViewPageEventArgs e)\r\n at System.Web.UI.WebControls.GridView.HandlePage(Int32 newPage)\r\n at System.Web.UI.WebControls.GridView.HandleEvent(EventArgs e, Boolean causesValidation, String validationGroup)\r\n at System.Web.UI.WebControls.GridView.RaisePostBackEvent(String eventArgument)\r\n at System.Web.UI.WebControls.GridView.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)\r\n at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)\r\n at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)\r\n at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)"

Please reply me ASAP.
Regards,
Rajesh D

Unable to access the gridview present inside the RadMultiPage

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