จะส่งค่าจาก Gridview ที่มีชนิดเป็น real ไปเก็บในตัวแปร Session อย่างไรครับ

protected void btnEditEmployee_Click(object sender, EventArgs e)
    {
        GridViewRow row = ((Button)sender).Parent.Parent as GridViewRow;

        Session["employee_id"] = row.Cells[1].Text;
        Session["employee_code"] = row.Cells[2].Text;
        Session["first_name"] = row.Cells[3].Text;
        Session["last_name"] = row.Cells[4].Text;
        Session["department"] = row.Cells[5].Text;
        Session["division"] = row.Cells[6].Text;
        Session["position"] = row.Cells[7].Text;
        Session["birthday"] = row.Cells[8].Text;
        Session["salary"] = row.Cells[9].Text;
        Session["type"] = row.Cells[10].Text;
        Session["active"] = row.Cells[11].Text;

        Response.Redirect("EditEmployee.aspx");
    }