Grid Control has null value when firing event

[Qiang]

Hello guys,

This is my first post on this forum. I got a null GridControl value when I fire a event.

I have a RadGrid and a button control on a page. When I click the button I want a event to be fired in order to bring up export method to export the grid contents into a Excel file. But when I click the button, I always get null value for the GridControl property of Sender.

Here is the code:

	<%@ Page Language="C#" MasterPageFile="~/Templates/Site.master" AutoEventWireup="true" CodeFile="SupplierSearch.aspx.cs" Inherits="ApprovedSupplier_SupplierSearch" Title="Global Quality Web" %>
	<%@ Register TagPrefix="uc" TagName="DatePicker" Src="~/UserControls/Common/DatePicker.ascx" %>
	<%@ Register TagPrefix="uc" TagName="Attachments" Src="~/UserControls/Common/AttachmentControl.ascx" %>
	<%@ Register TagPrefix="uc" TagName="LookupBase" Src="~/UserControls/Common/LookupBase.ascx" %>
	<%@ Register TagPrefix="uc" TagName="DateTimePicker" Src="~/UserControls/Common/DatePicker.ascx" %>
	<%@ Register TagPrefix="uc" TagName="SnapControl" Src="~/UserControls/Common/SnapControl.ascx" %>
	<%@ Register TagPrefix="uc" TagName="ExportPanel" Src="~/UserControls/Common/ExportPanel.ascx" %>
	<asp:Content ID="Content1" ContentPlaceHolderID="SiteContentHolder" Runat="Server">
	<script type="text/javascript">
	function onClickSupplierId(id) {
	var url = 'SuppAppReq.aspx?id=' + id;
	if(window.parent) {
	window.parent.location.href = url;
	}
	else {
	window.location.href = url;
	}
	}
	function onClickDeleteSupplier(id) {
	if(confirm("Do you really want to delete record " + id + " ?")) {
	var url = 'SupplierSearch.aspx?isDeleted=true&id=' + id;
	if(window.parent) {
	window.parent.location.href = url;
	}
	else {
	window.location.href = url;
	}
	}
	}
	</script>
	<div id="qsButtons" runat="server" visible="false">
	<asp:ImageButton ID="btnNewSupplier" OnClientClick="ShowProgressBar();" OnClick="btnNewSupplier_OnClick"  Runat="Server" ImageUrl="~/Images/NOV/Menu/NOVaddNewSupplier.gif" AlternateText="New Location" ImageAlign="AbsMiddle"/>
	<asp:ImageButton ID="btnAdvancedSearch" OnClientClick="ShowProgressBar();" OnClick="btnAdvancedSearch_OnClick"  Runat="Server" ImageUrl="~/Images/NOV/Menu/NOVadvSch.gif" AlternateText="Advanced Search" ImageAlign="AbsMiddle"/>
	</div>
	<div id="Filters" class="IFrameFilters"></div>
	<uc:SnapControl ID="SnapControl" DivID="Filters" Text="Supplier Filters" runat="server">
	<Content>
	<table border="0" cellpadding="4" cellspacing="2">
	<tr>
	<td>Legal Name:</td>
	<td><asp:TextBox ID="txtLegalName" runat="server"></asp:TextBox></td>
	<td>Supplier Title:</td>
	<td><asp:TextBox ID="txtSupplierTitle" runat="server"></asp:TextBox></td>
	<td>Supplier Email:</td>
	<td><asp:TextBox ID="txtSupplierEmail" runat="server"></asp:TextBox></td>
	</tr>
	<tr>
	<td>ERP Supplier No:</td>
	<td><asp:TextBox ID="txtERPSupplierNumber" runat="server"></asp:TextBox></td>
	<td>Business Unit:</td>
	<td><asp:TextBox ID="txtBusinessUnit" runat="server"></asp:TextBox></td>
	<td>Number Machinists:</td>
	<td><asp:TextBox ID="txtNumMachinists" runat="server"></asp:TextBox></td>
	</tr>
	<tr>
	<td>Manual Machines:</td>
	<td><asp:TextBox ID="txtManualMachines" runat="server"></asp:TextBox></td>
	<td>Number Shifts:</td>
	<td><asp:TextBox ID="txtNumShifts" runat="server"></asp:TextBox></td>
	<td>Number CNC:</td>
	<td><asp:TextBox ID="txtNumCNC" runat="server"></asp:TextBox></td>
	</tr>
	<tr>
	<td>Type of service:</td>
	<td><asp:TextBox ID="txtTypeSvc" runat="server" /></td>
	<td>Date Cap Update:</td>
	<td><uc:DatePicker ID="txtDateCapUdate" runat="server" AllowClear="true" /></td>
	<td>Supplier Category:</td>
	<td><asp:TextBox ID="txtSupplierCategory" runat="server"></asp:TextBox></td>
	</tr>
	<tr>
	<td>Approval Status:</td>
	<td>
	<asp:DropDownList ID="ddlApprovalStatus" runat="server" >
	<asp:ListItem Value="" Text="[All]" />
	<asp:ListItem Value="0" Text="Being Reviewed" />
	<asp:ListItem Value="1" Text="Approved" />
	<asp:ListItem Value="2" Text="Suspended" />
	</asp:DropDownList>
	</td>
	<td>Approval Method:</td>
	<td><asp:TextBox ID="txtApprovalMethod" runat="server" /></td>
	</tr>
	<tr>
	<td colspan="6">
	<asp:ImageButton ID="btnFilter" OnClientClick="ShowProgressBar();" Runat="Server" ImageUrl="~/Images/NOV/Menu/NOVfilter.gif" AlternateText="Filter" ImageAlign="AbsMiddle"/>
	<asp:ImageButton ID="btnAddNew" OnClick="btnNewSupplier_OnClick" OnClientClick="ShowProgressBar();" Runat="Server" ImageUrl="~/Images/NOV/Menu/NOVaddNewSupplier.gif" AlternateText="Add Location" ImageAlign="AbsMiddle"/>
	</td>
	</tr>
	<tr>
	<td colspan="6">
	<asp:Label ID="Label1" Text="To perform a search with wildcards use a *. For example, to search for everything that starts with B, use B*.<br/><br/>To search for an exact string, surround the string in quotes.  For example, to search for Asia Pacific, use &quot;Asia Pacific&quot;." ForeColor="red" runat="server"></asp:Label>
	</td>
	</tr>
	</table>
	</Content>
	</uc:SnapControl>
	<br />
	<rad:RadGrid ID="grdSupplier" runat="server" DataSourceID="dsSupplier"
	AutoGenerateColumns="false" AllowPaging="true" AllowSorting="true"
	PageSize="50" Width="99.8%" OnDataBound="RadGrid_DataBound" OnItemCreated="RadGrid_Setup">
	<MasterTableView>
	<Columns>
	<rad:GridHyperLinkColumn DataTextField="SupplierName" HeaderText="Supplier Name" SortExpression="SupplierName" DataNavigateUrlFormatString="javascript:onClickSupplierId('{0}');" DataNavigateUrlFields="SupplierId"></rad:GridHyperLinkColumn>
	<rad:GridBoundColumn DataField="BusinessUnit" HeaderText="Business Unit" SortExpression="BusinessUnit"></rad:GridBoundColumn>
	<rad:GridBoundColumn DataField="ERPSupplierNum" HeaderText="ERP Supplier No" SortExpression="ERPSupplierNum"></rad:GridBoundColumn>
	<rad:GridBoundColumn DataField="DateCapUpdate" HeaderText="Date Cap Update" SortExpression="DateCapUpdate"></rad:GridBoundColumn>
	<rad:GridBoundColumn DataField="ApprovalMethod" HeaderText="ApprovalMethod" SortExpression="ApprovalMethod"></rad:GridBoundColumn>
	<rad:GridBoundColumn DataField="Notes" HeaderText="Notes" SortExpression="Notes"></rad:GridBoundColumn>
	<rad:GridHyperLinkColumn Text="delete" HeaderText="delete" DataNavigateUrlFormatString="javascript:onClickDeleteSupplier('{0}');" DataNavigateUrlFields="SupplierId" ItemStyle-Width="50"></rad:GridHyperLinkColumn>
	</Columns>
	</MasterTableView>
	</rad:RadGrid>
	<uc:ExportPanel ID="ExportPanel" OnExcelExportClick="Click_ExcelExport" runat="server" />
	<c:SupplierDataSource ID="dsSupplier" runat="server" Sort="SupplierName" SelectMethod="GetPaged">
	<Parameters>
	<asp:ControlParameter Name="WhereClause" ControlID="__Page" PropertyName="WhereClause" />
	</Parameters>
	</c:SupplierDataSource>
	</asp:Content>

The code capturing the event is like this:

	public virtual void Click_ExcelExport(object sender, EventArgs e)
	{
	ExportGrid(sender, e, true);
	}

When I debug, the sender contains a null value in GridControl property.

Regards,

Qiang

[Yavor]

Hello Qiang,

You can call the grdSupplier.MasterTableView.ExportToExcel(); method directly to export the control's data.

Kind regards,
Yavor
the Telerik team

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