C#.net ขอคำแนะนำการแสดงข้อมูลของแบบเรียวไทม์ datagridview ด้วยครับ

private void showdata()
        {
            var qt = from md in tsm.MD16ALERs
                     where md.FCOMCODE == "cc" || md.FCOMCODE == "cb"
                     orderby md.FNEXTALTTM ascending
                     select new
                     {
                         md.FALERTNO,
                         md.FCOMCODE,
                         md.FLASTALERT,                         
                         nexttime = md.FNEXTALTDT.Value.Day + "/" +
                         md.FNEXTALTDT.Value.Month + "/" +
                         md.FNEXTALTDT.Value.Year + "    เวลา " + md.FNEXTALTTM,
                     };
            
            dataGridView1.DataSource = qt.ToList();
            setImage2Column();
            dataGridView1.Refresh();
        }
        private void setImage2Column()
        {
            
            for (int i = 0; i <= dataGridView1.RowCount - 1; i++)
            {                
                string Lasttime = Convert.ToString(dataGridView1.Rows[i].Cells[3].Value);
                var today = DateTime.Today.ToString();
                                
                if (today == Lasttime)
                {
                    dataGridView1.Rows[i].Cells["Status"].Value = Properties.Resources.check_marks;
                    dataGridView1.Rows[i].Cells["Status"].ToolTipText = "Pass";
                    dataGridView1.Rows[i].ReadOnly = false;
                }
                else
                {
                    dataGridView1.Rows[i].Cells[2].Style.ForeColor = Color.Red;
                    dataGridView1.Rows[i].Cells[2].Style.BackColor = Color.Yellow;
                    dataGridView1.Rows[i].Cells[2].ReadOnly = false;

                    dataGridView1.Rows[i].Cells["Status"].Value = Properties.Resources.coming;
                    dataGridView1.Rows[i].Cells["Status"].ToolTipText = "Faliure";
                }
            }
        }