Calculate Sum of TextBoxes in each Column and Display in Footer Row of GridView

This way

    <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false" ShowFooter="true">
        <Columns>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("Col1") %>' />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:TextBox ID="TextBox2" runat="server" Text='<%# Eval("Col2") %>' />
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:TextBox ID="TextBox3" runat="server" Text='<%# Eval("Col3") %>' />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
        <FooterStyle BackColor="Aquamarine" />
    </asp:GridView>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
    <script type="text/javascript">
        $("[id*=GridView1] input[type=text]").live("blur", function () {
            Calculate(this);
        });
        $("[id*=GridView1] input[type=text]").live("keyup", function () {
            Calculate(this);
        });
        function Calculate(t) {
            if (!jQuery.trim($(t).val()) == '') {
                if (!isNaN(parseFloat($(t).val()))) {
                    var row = $("tr:last-child", $(t).closest("table"));
                    var idx = $(t).closest("td").index();
                }
            } else {
                $(t).val('0');
            }
            var grandTotal = 0;
            $("[id*=GridView1] tr").each(function () {
                if ($(this).index() != $("[id*=GridView1] tr:first-child").index() && $(this).index() != $("[id*=GridView1] tr:last-child").index()) {
                    grandTotal = grandTotal + parseFloat($("input", $("td", this).eq(idx)).val());
                }
            });
            $("td", "[id*=GridView1] tr:last-child").eq(idx).html(grandTotal);
        }
    </script>

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Col1"), new DataColumn("Col2"), new DataColumn("Col3") });
            dt.Rows.Add(221, 12, 78);
            dt.Rows.Add(156, 198, 88);
            dt.Rows.Add(44, 12, 109);
            GridView1.DataSource = dt;
            GridView1.DataBind();

            int sum1, sum2, sum3;
            sum1 = 0;
            sum2 = 0;
            sum3 = 0;
            foreach(GridViewRow row in GridView1.Rows)
            {
                if(row.RowType == DataControlRowType.DataRow)
                {
                    sum1 += int.Parse((row.FindControl("TextBox1") as TextBox).Text);
                    sum2 += int.Parse((row.FindControl("TextBox1") as TextBox).Text);
                    sum3 += int.Parse((row.FindControl("TextBox1") as TextBox).Text);
                }
            }
            GridView1.FooterRow.Cells[0].Text = sum1.ToString();
            GridView1.FooterRow.Cells[1].Text = sum2.ToString();
            GridView1.FooterRow.Cells[2].Text = sum3.ToString();
        }
}