Setting More than 1 DataKeys In GridView

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<asp:GridView ID="gvwSiteVisitDetails" runat="server" Width="100%" AllowPaging="True" DataKeyNames="GATExecutionDepartmentSiteVisitID,GATSiteVisitID" onrowdatabound="gvwSiteVisitDetails_RowDataBound" onpageindexchanging="gvwSiteVisitDetails_PageIndexChanging" > <Columns> <asp:BoundField HeaderText="GATExecutionDepartmentSiteVisitID" Visible="False" DataField="GATExecutionDepartmentSiteVisitID" /> <asp:BoundField HeaderText="GATSiteVisitID" Visible="False" DataField="GATSiteVisitID" /> </Columns> <EmptyDataTemplate> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td style="text-align: center; height: 16px;"> <asp:Label ID="lblSiteVisit" runat="server" Font-Bold="False" SkinID="NoRecords" Text="No site visit details are loaded" Width="100%"></asp:Label> </td> </tr> </table> </EmptyDataTemplate> </asp:GridView>