Get Value of gridview field that is set to visible false

I have a Primary key that is invisible in the gridview. When the row is selected in the gridview i would like to get the value of this field.

I tried datakeynames with no luck so far
techpr0Asked:
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techpr0Author Commented:
using vb.net
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nepaluzCommented:
some code?
invisible key....? datasource ....?
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techpr0Author Commented:
this is the first few lines of the gridview
             <asp:GridView ID="GridView1" runat="server" DataSourceID="SqlDataSource2" 
                    AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False" 
                    BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" 
                    CellPadding="4" ForeColor="Black" GridLines="Vertical" 
        Width="720px" PageSize="25" DataKeyNames="CertID">
          <RowStyle BackColor="#F7F7DE" />
          <Columns>
              <asp:CommandField ShowSelectButton="True" ButtonType="Image" 
                  SelectImageUrl="images/clean.png" />
             <asp:BoundField DataField="CertID" HeaderText="CertID" 
                InsertVisible="False" ReadOnly="True" SortExpression="CertID" Visible=false />
             <asp:BoundField DataField="Invoice Authorization" HeaderText="Invoice Authorization" 
                SortExpression="Invoice Authorization" >
              <HeaderStyle Font-Size="Small" />                
              <ItemStyle HorizontalAlign="Center" Width="30px" />
            </asp:BoundField>
             <asp:BoundField DataField="Serial Number" HeaderText="Serial Number" 
                SortExpression="Serial Number" >
              <HeaderStyle Font-Size="Small" HorizontalAlign="Center" />                
              <ItemStyle HorizontalAlign="Center" />
            </asp:BoundField>
            <asp:BoundField DataField="Name" HeaderText="Customer Name" SortExpression="Name">
              <HeaderStyle Font-Size="Small" HorizontalAlign="Center" />                
              <ItemStyle HorizontalAlign="Center" Width="170px" />
            </asp:BoundField>

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