C# winApp ต้องการให้โค้ดทำงาน ถึงแม้จะปิดหน้าฟอร์มนั้นๆ ไป ครับ

private class F_717_Lot
        {
            public int ID;
            public int Digit;
            public double Down3SD;
            public double Up3SD;
            public F_717_Lot(int id, int dg, double d, double u)
            {
                ID = id;
                Digit = dg;
                Down3SD = d;
                Up3SD = u;
            }
        }
        List<string> sqls;

        void SaveData(DateTime dateTime1, DateTime dateTime2, List<F_717_Lot> _LotIDs)
        {
            DateTime dt01 = dateTime1, dt02 = dateTime2, dt_value;
            double[] v = new double[10];
            List<F_717_Lot> LotIDs = _LotIDs;
            dt_value = dllExtension.ExtenedDatetime.RandomTodayTime(dt01, 8, 10);
            Action<F_717_Lot,int ,int> getSQL = (l,start,final) =>
            {
                dt_value = dllExtension.ExtenedDatetime.RandomTodayTime(dt_value, start, final);

                lblAddDataStatus.Invoke(new Action(() => lblAddDataStatus.Text = "Adding date.." + dt_value));
                for (int a = 0; a < 10; a++)
                    v[a] = ExtenedDataGridView.rnd.NextDouble(l.Down3SD, l.Up3SD, l.Digit);
                string name = ExtForm.RandomName(Names);
                sqls.Add( "INSERT [dbo].[ALS_F_717] VALUES('" + l.ID + "','" +
                dt_value + "','" +r.NextDouble(24.5, 28.5, 2)  + "','" + r.Next(48, 60) + "','" +
                v[0] + "','" + v[1] + "','" + v[2] + "','" + v[3] + "','" + v[4] + "','" + v[5] + "','" +
                v[6] + "','" + v[7] + "','" + v[8] + "','" + v[9] + "','" + v.Average() + "','" + true +
                "','" + name + "','' )");

            };
            while (dt_value < dt02)
            {
               
                System.Threading.Thread.Sleep(200);
                if (dt_value.DayOfWeek != DayOfWeek.Sunday)
                {
                    LotIDs.ForEach(lotid =>
                    {
                        getSQL(lotid,8,10);
                        getSQL(lotid, 13, 15);
                    });
                }

                dt_value = dt_value.AddDays(1);

            };

        }
        string FolTemp;
        List<string> Names;
        private void cmdSave6021_Click(object sender, EventArgs e)
        {
            FolTemp = Path.GetTempPath() + $@"DATA_LAB";
            sqls = new List<string>();
            List<F_717_Lot> LotIDs = new List<F_717_Lot>();

            for (int i = 0; i < aLS_F_717_Lot_AVGDataGridView.RowCount - 1; i++)
            {
                if (aLS_F_717_Lot_AVGDataGridView[1, i].Value != null)
                {
                    if (Convert.ToBoolean(aLS_F_717_Lot_AVGDataGridView[0, i].Value))
                    {

                        LotIDs.Add(new F_717_Lot((int)aLS_F_717_Lot_AVGDataGridView[1, i].Value,
                            Convert.ToInt32(aLS_F_717_Lot_AVGDataGridView[3, i].Value.ToString().Trim()),
                            Convert.ToDouble(aLS_F_717_Lot_AVGDataGridView[4, i].Value.ToString().Trim()) - 2.9 * Convert.ToDouble(aLS_F_717_Lot_AVGDataGridView[5, i].Value.ToString().Trim()),
                            Convert.ToDouble(aLS_F_717_Lot_AVGDataGridView[4, i].Value.ToString().Trim()) + 2.9 * Convert.ToDouble(aLS_F_717_Lot_AVGDataGridView[5, i].Value.ToString().Trim())));
                    }

                }
            }
            string combinedFilePath = "";// = FolTemp + $@"\AutoSave ALS717 {DateTime.Now.ToString("yyyyMMdd hhmmss ffff")}.sql";
            using (SaveFileDialog SaveFileDialog1 = new SaveFileDialog())
            {
                SaveFileDialog1.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
                SaveFileDialog1.Title = "Save sql Files";
                SaveFileDialog1.DefaultExt = "sql";
                SaveFileDialog1.Filter = "sql files (*.sql)|*.sql";
                SaveFileDialog1.FileName = $@"Save ALSF717 {DateTime.Now.ToString("yyyyMMdd hhmmss ffff")}.sql";
                if (SaveFileDialog1.ShowDialog() == DialogResult.OK)
                {
                    combinedFilePath = SaveFileDialog1.FileName;
                }
            }
            using (WaitFormDialog f = new WaitFormDialog(new Action(() =>
            {

                using (frmEmpSelect ff = new frmEmpSelect())
                {
                    ff.ShowDialog();
                    if (ff.Names.Count > 0)
                    {
                        Names = ff.Names;
                        DateTime dt01 = dtpStart.Value;
                        DateTime dt02;

                        List<Task> tasks = new List<Task>();

                        while (dt01 < dtpFinal.Value)
                        {
                            System.Threading.Thread.Sleep(200);
                            DateTime date = dt01.AddDays(15);
                            dt02 = date >= dtpFinal.Value ? dtpFinal.Value : date;
                            tasks.Add(Task.Factory.StartNew(() => SaveData(dt01.ToDatetimeThai(), dt02.ToDatetimeThai(), LotIDs)));
                            System.Threading.Thread.Sleep(5000);
                            dt01 = dt02;
                        }
                        // Wait for the tasks to complete before displaying a completion message.
                        Task.WaitAll(tasks.ToArray());

                        System.Threading.Thread.Sleep(1000);

                        // string[] sqlFiles = Directory.GetFiles(FolTemp, "*.sql");
                        StringBuilder combinedSql = new StringBuilder();
                        int countSave = 0;
                        combinedSql.Append("USE [DATALAB] \r\nGO\r\n");
                        foreach (string sql in sqls)
                        {
                            combinedSql.AppendLine(sql);
                            countSave++;
                            if (countSave >= 300)
                            {
                                combinedSql.AppendLine("\nGO\n");

                                countSave = 0;
                            }
                        }
                        Directory.CreateDirectory(Path.GetDirectoryName(combinedFilePath));
                        using (StreamWriter writer = File.CreateText(combinedFilePath))
                        {
                            writer.Write(combinedSql.ToString());
                        }
                    }
                }


                // File.WriteAllText(combinedFilePath, combinedSql.ToString());

                MessageBox.Show("Compete");
            })))
            {
                f.ShowDialog(this);
                grpAutoSaveData.Visible = false;
                this.aLS_F_717TableAdapter.FillByLotID(aLS_F_717DataSet.ALS_F_717, LotID);
                //dgv.Sort(dgv.Columns[2], ListSortDirection.Ascending);
                aLS_F_717DataGridView.Sort(aLS_F_717DataGridView.Columns[2], ListSortDirection.Ascending);
                if (aLS_F_717DataGridView.Rows != null && aLS_F_717DataGridView.Rows.Count > 0)
                {
                    int lastRowIndex = aLS_F_717DataGridView.Rows.Count - 1;
                    aLS_F_717DataGridView.CurrentCell = aLS_F_717DataGridView.Rows[lastRowIndex].Cells[2]; 
                }
            }
        }

List<Task> tasks = new List<Task>();

tasks.Add(Task.Factory.StartNew(() => SaveData(dt01.ToDatetimeThai(), dt02.ToDatetimeThai(), LotIDs)));

 LotIDs.ForEach(lotid =>
                    {
                        getSQL(lotid,8,10);
                        getSQL(lotid, 13, 15);
                    });

sqls.Add( "INSERT [dbo].[ALS_F_717] VALUES('" + l.ID + "','" +
                dt_value + "','" +r.NextDouble(24.5, 28.5, 2)  + "','" + r.Next(48, 60) + "','" +
                v[0] + "','" + v[1] + "','" + v[2] + "','" + v[3] + "','" + v[4] + "','" + v[5] + "','" +
                v[6] + "','" + v[7] + "','" + v[8] + "','" + v[9] + "','" + v.Average() + "','" + true +
                "','" + name + "','' )");

 Task.WaitAll(tasks.ToArray());

$@"Save ALSF717 {DateTime.Now.ToString("yyyyMMdd hhmmss ffff")}.sql";

StringBuilder combinedSql = new StringBuilder();
                        int countSave = 0;
                        combinedSql.Append("USE [DATALAB] \r\nGO\r\n");
                        foreach (string sql in sqls)
                        {
                            combinedSql.AppendLine(sql);
                            countSave++;
                            if (countSave >= 300)
                            {
                                combinedSql.AppendLine("\nGO\n");

                                countSave = 0;
                            }
                        }
                        Directory.CreateDirectory(Path.GetDirectoryName(combinedFilePath));
                        using (StreamWriter writer = File.CreateText(combinedFilePath))
                        {
                            writer.Write(combinedSql.ToString());
                        }