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Grid Control has null value when firing event

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Qiang
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Qiang asked on 31 Oct 2008, 09:52 PM
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




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Yavor
Telerik team
answered on 04 Nov 2008, 07:20 AM
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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