Calculate sum of each column of GridView using jQuery in ASP.Net

Here I have created sample that calculates both quantity and price total.

HTML

<div>
    <div>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
        <script type="text/javascript">
            $(function () {
                $("[id*=txtQuantity]").val("0");
            });
            $("[id*=txtQuantity]").live("keyup", function () {
                if (isNaN(parseInt($(this).val()))) {
                    $(this).val('0');
                } else {
                    $(this).val(parseInt($(this).val()).toString());
                }
            });
            $("[id*=txtQuantity]").live("keyup", function () {
                if (!jQuery.trim($(this).val()) == '') {
                    if (!isNaN(parseFloat($(this).val()))) {
                        var row = $(this).closest("tr");
                        $("[id*=lblTotal]", row).html(parseFloat($(".price", row).html()) * parseFloat($(this).val()));
                    }
                } else {
                    $(this).val('');
                }

                var totalQuantity = 0;

                $("[id*=txtQuantity]").each(function () {
                    totalQuantity = totalQuantity + parseInt($(this).val());
                });
                $("[id*=lblTotalQuantity]").html(totalQuantity.toString());

                var grandTotal = 0;
                $("[id*=lblTotal]").each(function () {
                    grandTotal = grandTotal + parseFloat($(this).html());
                });
                $("[id*=lblGrandTotal]").html(grandTotal.toString());
            });
        </script>
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
            <Columns>
                <asp:BoundField DataField="Item" HeaderText="Item" />
                <asp:BoundField DataField="Price" HeaderText="Price" ItemStyle-CssClass="price" />
                <asp:TemplateField HeaderText="Quantity">
                    <ItemTemplate>
                        <asp:TextBox ID="txtQuantity" runat="server"></asp:TextBox>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Total">
                    <ItemTemplate>
                        <asp:Label ID="lblTotal" runat="server" Text="0"></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>
    </div>
    <div>
        Total Quantity :
        <asp:Label ID="lblTotalQuantity" Text="0" runat="server" />
        Grand Total :
        <asp:Label ID="lblGrandTotal" Text="0" runat="server" />
    </div>
</div>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[2] { new DataColumn("Item"), new DataColumn("Price", typeof(decimal)) });
        dt.Rows.Add("Shirt", 145.25);
        dt.Rows.Add("Jeans", 400.50);
        dt.Rows.Add("Trousers", 190.0);
        dt.Rows.Add("Tie", 300.75);
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }
}

Screenshot