C# WinApp ช่วยดู datagrid ให้หน่อยครับ อยากให้รหัสเดียวกันเป็น สีเดียวกัน

         void RefreshData()
        {

            Cursor = Cursors.WaitCursor;
            textBox1.Text = "";
            comboBox1.Text = "แสดงทั้งหมด";
            System.Text.RegularExpressions.Regex rgx = new System.Text.RegularExpressions.Regex(@"(?:([A-Za-z]+).*?([0-9]+))");
            if (System.IO.Directory.GetFiles(TORServices.PathFile.PathData.Path_AllReport, "*.Report", System.IO.SearchOption.AllDirectories).Length <= 0) { Cursor = Cursors.Default; return; }
            if (dt != null) { dt = null; }
            dt = new DataTable();
            dt.Columns.Add(new DataColumn("SampleID", typeof(string)));
            dt.Columns.Add(new DataColumn("Parameter", typeof(string)));
            dt.Columns.Add(new DataColumn("Value", typeof(string)));
            dt.Columns.Add(new DataColumn("Date", typeof(string)));
            dt.Columns.Add(new DataColumn("ผู้วิเคราะห์", typeof(string)));
            dt.Columns.Add(new DataColumn("ผู้ตรวจสอบ", typeof(string)));
            dt.Columns.Add(new DataColumn("Seleced", typeof(Boolean)));
            string FileExcel,sampleID;
            int _i;
            foreach (string _f in System.IO.Directory.GetFiles(TORServices.PathFile.PathData.Path_AllReport, "*.Report",System.IO.SearchOption.AllDirectories))
            {
                //เช็คการเปิดไฟล์ถ้าเปิดให้ก๊อบไปวางที่ Temp
                if (System.IO.File.GetCreationTime(_f) >= dateTimePicker1.Value && System.IO.File.GetCreationTime(_f) <= dateTimePicker2.Value.AddDays(1))
                {
                    FileExcel = pathTemp + "\\" +  String.Format("{0:ddMMyyyy HHmmss}", DateTime.Now) +  System.IO.Path.GetExtension(_f);
                        System.IO.File.Copy(_f, FileExcel);
                        try
                        {
                            OfficeOpenXml.ExcelPackage package = new OfficeOpenXml.ExcelPackage(new System.IO.FileInfo(FileExcel));
                            OfficeOpenXml.ExcelWorksheet sheet = package.Workbook.Worksheets[1];

                            int item;
                            if (sheet.Cells[2, 3].Value != null)
                            {
                                DateTime dd = (DateTime)sheet.Cells[2, 3].Value;
                                for (int i = 1; i < sheet.Dimension.End.Row; i++)
                                {
                                    item = 15;
                                    if (sheet.Cells[i, item].Value != null)
                                    {

                                        if (sheet.Cells[i, item].Value.ToString() != "" && rgx.IsMatch(sheet.Cells[i, item].Value.ToString()))
                                        {
                                            DataRow dr = dt.NewRow();
                                            sampleID =  sheet.Cells[i, item].Value.ToString();
                                            dr["SampleID"] =rgx.Match(sampleID).Groups[1].Value.ToUpper() + " " +string.Format("{0:0000}",  int.Parse(rgx.Match(sampleID).Groups[2].Value));
                                            dr["Parameter"] = sheet.Cells[i, item + 1].Value;
                                            dr["Value"] = sheet.Cells[i, item + 2].Value.ToString();
                                            dr["Date"] = dd;
                                            dr["ผู้วิเคราะห์"] = sheet.Cells[i, item + 4].Value;
                                            dr["ผู้ตรวจสอบ"] = sheet.Cells[i, item + 5].Value;
                                            dr["Seleced"] = false;
                                            dt.Rows.Add(dr);
                                        }
                                    }
                                }
                                sheet = package.Workbook.Worksheets[2];
                                for (int i = 1; i < sheet.Dimension.End.Row; i++)
                                {
                                    item = 18;
                                    if (sheet.Cells[i, item].Value != null)
                                    {
                                        if (sheet.Cells[i, item].Value.ToString() != "" && rgx.IsMatch(sheet.Cells[i, item].Value.ToString()))
                                        {
                                            DataRow dr = dt.NewRow();
                                            sampleID = sheet.Cells[i, item].Value.ToString();
                                            dr["SampleID"] = rgx.Match(sampleID).Groups[1].Value.ToUpper() + " " + string.Format("{0:0000}", int.Parse(rgx.Match(sampleID).Groups[2].Value));
                                            dr["Parameter"] = sheet.Cells[i, item + 1].Value;
                                            dr["Value"] = sheet.Cells[i, item + 2].Value.ToString();
                                            dr["Date"] = dd;
                                            dr["ผู้วิเคราะห์"] = sheet.Cells[i, item + 4].Value;
                                            dr["ผู้ตรวจสอบ"] = sheet.Cells[i, item + 5].Value;
                                            dr["Seleced"] = false;
                                            dt.Rows.Add(dr);
                                        }
                                    }
                                }
                            }
                            package = null;
                        }
                        catch { }
                        finally { System.IO.File.Delete(FileExcel); }
                    }
                try
                {
                    dataGridView1.Invoke(new Action(() =>
                    {
                        dataGridView1.DataSource = dt;
                        dataGridView1.Columns[2].Width = 120;
                        dataGridView1.Columns[3].Width = 150;
                        dataGridView1.Columns[4].Width = 180;
                        dataGridView1.Columns[5].Width = 180;
                        dataGridView1.Columns[6].Width = 80;
                        dataGridView1.Sort(dataGridView1.Columns[0], ListSortDirection.Ascending);
                    }));
                }
                catch { }
                }
            Cursor = Cursors.Default;

            }

private void dataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
        {
            //Color cl1 = Color.Beige;
            //Color cl2 = Color.LightGreen;
            Color cl = Color.Beige;
            for (int i = 1; i < dataGridView1.Rows.Count - 1; i++)
            {
                cl = (dataGridView1[0, i].Value.ToString() == dataGridView1[0, i - 1].Value.ToString()) ? cl : (cl != Color.Beige) ? Color.Beige : Color.LightGreen;
                dataGridView1.Rows[i].DefaultCellStyle.BackColor = cl;
                dataGridView1[0, i].Style.ForeColor = (dataGridView1[0, i].Value.ToString() == dataGridView1[0, i - 1].Value.ToString()) ? cl : dataGridView1[0, i].Style.ForeColor;
            }
        }