How do I take value from a gridview to a textbox?

See more:

VB

ASP.NET

In my code below I have a gridview that shows in a popup window...when i seleect a row I want i want the first column to show up in textbox1 ..how do i do that?

<asp:ModalPopupExtender ID="mpe" runat="server" BehaviorID="popup1" PopupControlID="pnlPopup" TargetControlID="btnloccode"
            OkControlID="btnOK" CancelControlID="btnCancel" BackgroundCssClass="modalBackground">
        </asp:ModalPopupExtender>
        <asp:Panel ID="pnlPopup" runat="server" CssClass="modalPopup" Style="display: none">
            <div class="header">
                List Selection
            </div>
                <br />
            <asp:UpdatePanel ID="UpdatePanel1" runat="server" align="left">
            <ContentTemplate>
        <asp:Panel runat="server" ID="pnl1" Style="max-height: 300px; overflow-y: scroll;">
    <asp:GridView ID="LocationGridView" HeaderStyle-BackColor="#0066CC" HeaderStyle-ForeColor="White"
        runat="server" AutoGenerateColumns="false" DataSourceID="SQLlistsel" OnDataBound="OnDataBound" Width="580">
        <Columns>
            <asp:BoundField DataField="LOCATIONID" HeaderText="Id" ItemStyle-Width="10">
            <ItemStyle Width="10px"/>
            </asp:BoundField>
            <asp:BoundField DataField="LOCNM" HeaderText="Name" ItemStyle-Width="100" >
            <ItemStyle Width="100px" />
            </asp:BoundField>
            <asp:BoundField DataField="STATUS" HeaderText="Status" ItemStyle-Width="100" >
            <ItemStyle Width="100px" />
            </asp:BoundField>
        </Columns>
        <HeaderStyle BackColor="#0066CC" ForeColor="White" />
    </asp:GridView>
    </asp:Panel>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
    <script src="Scripts/quicksearch.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $('.search_textbox').each(function (i) {
                $(this).quicksearch("[id*=LocationGridView] tr:not(:has(th))", {
                    'testQuery': function (query, txt, row) {
                        return $(row).children(":eq(" + i + ")").text().toLowerCase().indexOf(query[0].toLowerCase()) != -1;
                    }
                });
            });
        });
    </script>