Getting a value from checked Datagrid cell

[alan]

Hello,
I have got a datagrid with first column as a checkbox. I'm trying to
retrieve values from rows with checkbox checked.
For one column I'm doing something like:

<asp:datagrid id="Grid1" runat="server" DataKeyField="serial"
AutoGenerateColumns="True">
<ItemStyle></ItemStyle>
<HeaderStyle></HeaderStyle>
<Columns>
<asp:TemplateColumn HeaderText="First">
<ItemStyle HorizontalAlign="Center"></ItemStyle>
<ItemTemplate>
<asp:CheckBox ID="chkSelection" Runat="server" Checked="true"
AutoPostBack="true"></asp:CheckBox>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:datagrid>

That's the code behind:

Private Sub btnGenerate_Click(ByVal sender As System.Object, ByVal e As
System.Web.UI.ImageClickEventArgs) Handles btnGenerate.Click
Dim arrSerial As New ArrayList
Dim dgi As DataGridItem

For Each dgi In Grid1.Items
Dim chkbox As CheckBox
chkbox = CType(dgi.FindControl("chkSelection"), CheckBox)
If chkbox.Checked Then
Grid1.Data()
arrSerial.Add(Grid1.DataKeys(dgi.ItemIndex).ToStri ng())
End If
Next
End Sub

The above code works perfectly for the column serial (DataKeyField =
"serial"), what should I do to get checked values from other column?
Any help would be appreciated