Nulll in GridView EVAL Calling ServerSide Method In Item Template

<asp:GridView ID="GridView1" runat="server" 
              DataSourceID="SqlDataSource1" 
              AutoGenerateColumns="false">

<Columns>
<asp:BoundField ShowHeader="true" DataField="ID" 
                              HeaderText="ID" />
<asp:TemplateField HeaderText="Name">

<ItemTemplate>
<asp:Label ID="Label1" runat="server" 
           Text='<%# CheckNull(Eval("Name")) %>'>
</asp:Label>

</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Location">
<ItemTemplate>
<asp:Label ID="Label1" runat="server" 
           Text='<%# CheckNull(Eval("Location")) %>'>

</asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView> 

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.CS PAGE 

protected string CheckNull(object objGrid)
    {
        if (object.ReferenceEquals(objGrid, DBNull.Value))
        {
            return "No Record Found";
        }
        else
        {
            return objGrid.ToString();
        }
}