referencing controls inside a repeater

I have this generating my asp:repeater controls...

protected void repOrderLines_ItemDataBound(Object Sender, RepeaterItemEventArgs e) {
        Label olblProdID;
        OrderLine oOrderLine;

        olblProdID = (Label)(e.Item.FindControl("lblProductIDValue"));

        //Update product information
        oOrderLine = (OrderLine)e.Item.DataItem;
        olblProdID.Text = oOrderLine.ProductCode;

        //Add Order Quantity
        Label lblqty = new Label();
        lblqty.Width = new Unit("150px");
        lblqty.Text = oOrderLine.QtyOrdered.ToString();
        lblqty.ID = oOrderLine.ProductCode + "qty"; ;
        repOrderLines.Controls.Add(lblqty);

        //Add Quantity Filled
        Label lblqtyF = new Label();
        lblqtyF.Text = "0.00";
        lblqtyF.Width = new Unit("150px");
        lblqtyF.ID = oOrderLine.ProductCode + "qtf"; ;
        repOrderLines.Controls.Add(lblqtyF);


        //Add Image
        Image greenok = new Image();
        greenok.ID = oOrderLine.ProductCode + "img"; ;
        greenok.Visible = false;
        greenok.ImageUrl = "~/images/greencheck.gif";
        repOrderLines.Controls.Add(greenok);
    }

this is the aspx

<asp:Repeater ID="repOrderLines" runat="server"
                    OnItemDataBound="repOrderLines_ItemDataBound">
                    <ItemTemplate>
                        <asp:Label ID="lblProductIDValue" width="150px" runat="server"></asp:Label>
                    </ItemTemplate>
</asp:Repeater>

I want to be able to reference the labels inside the repeater like this:

protected void btnAddProd_Click(object sender, EventArgs e) {
        bool found = false;
        lblError.Visible = false;
        foreach (RepeaterItem i in repOrderLines.Items) {
            try {
                Label labelTest = (Label)i.FindControl(txtProductID.Text + "qtf");
                labelTest.Text = (Double.Parse(labelTest.Text) + 1).ToString();
                found = true;
                matchAmounts();

            }
            catch { }
        }
}
               

It doesn't seem to be working...

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