Checkboxes in Gridview using IE - asp.net

Question

I'm running into a strange issue. I'm trying to see what checkboxes are selected within the gridview. My code looks like it follows the examples I found on the internet, and works in FF & Chrome, but fails in IE9.
In IE9, the checked property never returns true. I've stepped through the code, and have verified that it's looking at the correct checkbox, but IE will always return false.
Does anyone have any ideas? Below is my markup & codebehind.
<asp:GridView ID="gvParts" runat="server"
AllowSorting="True" AutoGenerateColumns="False"
CellPadding="5" DataKeyNames="Rec_ID" DataSourceID="dsParts"
PageSize="50" Width="100%">
<Columns>
<asp:TemplateField HeaderText="Select">
<HeaderTemplate>
Select
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server"/>
</ItemTemplate>
<ItemStyle HorizontalAlign="Center" Width="75px" />
</asp:TemplateField>
<asp:BoundField DataField="Arcft_Make" HeaderText="Make"
SortExpression="Arcft_Make" >
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Arcft_Model" HeaderText="Model"
SortExpression="Arcft_Model" >
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Source_Name"
HeaderText="Source_Name"
SortExpression="Source_Name"
DataFormatString="{0:d}"
HtmlEncode="false">
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Part_Number"
HeaderText="Part Number"
SortExpression="Part_Number" >
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Vendor_Part_Number"
HeaderText="Vendor Number"
SortExpression="Vendor_Part_Number" >
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Vendor_Name"
HeaderText="Vendor Name"
SortExpression="Vendor_Name" >
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Descr"
HeaderText="Description"
SortExpression="Descr">
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle Width="300px" HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Date_Added"
HeaderText="Date_Added"
SortExpression="Date_Added">
<HeaderStyle HorizontalAlign="Left" />
<ItemStyle HorizontalAlign="Left" />
</asp:BoundField>
<asp:BoundField DataField="Rec_ID"
ReadOnly="True" Visible="False">
<ItemStyle Width="0px" />
</asp:BoundField>
<asp:CommandField ShowEditButton="True" />
</Columns>
<SelectedRowStyle BackColor="#FFFFCC" />
<AlternatingRowStyle BackColor="#CCFFFF" />
</asp:GridView>
`
And
Protected Sub btnAdd_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Handles btnAdd.Click
Dim Rec_IDs As New List(Of String)
Dim Rec_ID As Int32
Rec_IDs = Session("Rec_IDs")
For Each Row As GridViewRow In gvParts.Rows
If CType(Row.FindControl("chkSelect"), CheckBox).Checked Then
Rec_ID = gvParts.DataKeys(Row.RowIndex).Value
If Not Rec_IDs.Contains(Rec_ID) Then
Rec_IDs.Add(Rec_ID)
End If
CType(Row.FindControl("chkSelect"), CheckBox).Checked = False
End If
Next
Session("Rec_IDs") = Rec_IDs
lblCount.Text = String.Format("You have {0} records selected",
Rec_IDs.Count.ToString)
End Sub

Answer 1

OK, solved. My gridview wasn't inside my form tags. I guess IE didn't like that.