private void ByDay()
        {
            try
            {
                double day;

                if (EMP_ID != "")
                {
                    day = T_String.DT_GetDays(dt1, dt2, EMP_ID);
                    //txt_h.Text = T_String.Shift_WorkHour(EMP_ID, dt1.Value) + "";

                    if (day >= 1 && txt_h == "0")
                    {
                        txt_h = "8";
                    }
                }
                else
                {
                    day = T_String.DT_GetDays(dt1, dt2, EMP_ID);
                }

                txt_day = day + "";

                //NhuY: 2015/11/27
                //txt_hr.Text = T_String.IsNullTo00(day*T_String.IsNullTo00(txt_h.Text)+"").ToString("#,##0.##");
                txt_hr = txt_hr = T_String.IsNullTo00(day * 8.0 + "") + "";
                //				if (T_String.IsNullTo00(txt_h.Text) > T_String.IsNullTo00(txt_hr.Text))
                //					txt_h.Text = txt_hr.Text;
            }
            catch (Exception ex) { };
        }