Question : access gridview checkbox and rotate though rows to save

Finally upgrading to 3.5 but things are little different, what I am doing is using a updatepannel for ajax functionality and trying to access the checkbox to see if checked and then save data to a db but I get an error on this.

in the javascript error it tell me that
sys.webforms.pagerequestmanagerservererrorexception: unable to cast direct of type "System.ui.webcontrols.gridviewRow to type system.web.ui.webcontols.gridview.

Belwo is how I used to access a chcekbox in 1.1 but I think i am doing something wrong.
 
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<asp:UpdatePanel ID="UpdatePanel1" runat="server">
                <ContentTemplate>
                    <table width="100%" id="tblGrid" style="display:none">
                        <tr>
                            <td align="center">
                                <asp:GridView ID="myGridView" runat="server" AutoGenerateColumns="false" HorizontalAlign="Center" HeaderStyle-HorizontalAlign="Center" CellSpacing="5" BorderStyle="Solid" BorderWidth="1" BorderColor="blue">
                                    <Columns>
                                        <asp:TemplateField HeaderText="Delete">
                                            <ItemTemplate>
                                                <asp:CheckBox ID="cbDelete" runat="server" AutoPostBack="false" CausesValidation="false" />
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:BoundField DataField="intBenchMark" HeaderText="SID" />
                                        <asp:BoundField DataField="strBenchMarkname" HeaderText="Name" />
                                    </Columns>
                                </asp:GridView>
                            </td>
                        </tr>
                        <tr>
                            <td align="center">
                                <a onclick="javascript:cancelBenchMarks();" style="cursor:hand;color:Blue;text-decoration:underline;">cancel</a>
                                 &nbsp;&nbsp;&nbsp;<asp:LinkButton ID="lnkSave" runat="server">submit</asp:LinkButton>
                           </td>
                        </tr>
                    </table>
                </ContentTemplate>
            </asp:UpdatePanel>

Protected Sub lnkSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles lnkSave.Click
        For Each dgi As GridView In myGridView.Rows
            Dim Sid As Integer = Convert.ToInt32(dgi.Columns(1).ToString)
            Dim cb As CheckBox = DirectCast(dgi.FindControl("cbDelete"), CheckBox)

            If cb.Checked = True Then
                sql = "Delete from tblBenchMarkname where intSid = " & Sid
                Response.Write(sql)
                Response.End()
                insertUpdateDelete(sql)
            End If

        Next

    End Sub

Answer : access gridview checkbox and rotate though rows to save

This should be as

For Each dgi As GridView In myGridView.Rows

Correct
For Each dgi As GridViewRow In myGridView.Rows
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