C# เอาโค๊ดค้นหาเพลงซ้ำใน extreme karaoke มาให้ช่วยแก้ครับเหมือนมันยังช้าอยู่

namespace MIDI_System
{
    public static class CheckFileDupSetting
    {
        public static string FolKara = "";
        public static Label labelInvoke;
        public static int sngDel = 0;
        public static string FolDel = "";
        public static DataGridView GridView;
        public static int SongCheck = 0;
public static DataTable GetDataTableDBF(string _Path)
        {
            string PathData = "";
            if (_Path.ToUpper().EndsWith("\\DATA"))
            {
                PathData = _Path.ToUpper();
            }
            else
            {
                PathData = _Path.ToUpper() + "\\DATA";
            }
            string ConnectionString = "Dsn=dBASE Files;dbq=" + PathData.ToUpper() + ";defaultdir=" + PathData.ToUpper() + ";driverid=533;maxbuffersize=2048;pagetimeout=5";

            System.Data.Odbc.OdbcConnection conn = new System.Data.Odbc.OdbcConnection(ConnectionString);
            conn.Open();
            string strQuery = "SELECT CODE,TYPE,SUB_TYPE,ARTIST + TITLE as SongName FROM SONG order by ARTIST + TITLE";
            System.Data.Odbc.OdbcDataAdapter adapter = new System.Data.Odbc.OdbcDataAdapter(strQuery, conn);
            System.Data.DataSet ds = new System.Data.DataSet();
            adapter.Fill(ds);
            return ds.Tables[0];

        }
        public static void DelFile(string _FileName)
        {
            try { System.IO.File.Delete(_FileName); }
            catch
            {
                try
                {
                    System.IO.File.Move(_FileName, FolDel + "\\" + String.Format("{0:ddMMyyyyHHmmss}", DateTime.Now) + System.IO.Path.GetFileName(_FileName));
                }
                catch { }
            }
        }
    }

    public class CheckFileDup
    {
        System.Threading.Thread thd;
        int _Min;
        int _Max;
        public CheckFileDup(int min, int max)
        {
            _Min = min; _Max = max;
        }
        public void RunCheck()
        {
            thd = new System.Threading.Thread(new System.Threading.ThreadStart(CheckFile));
            thd.Start();
        }
        private void CheckFile()
        {
            string cri = "";
            for (int i = _Min; i <= _Max; i++)
            {
                if (CheckFileDupSetting.GridView[3, i].Value.ToString().Trim().Replace(" ", "").ToUpper() != cri)
                {
                    cri = CheckFileDupSetting.GridView[3, i].Value.ToString().Trim().Replace(" ", "").ToUpper();
                }
                else
                {
                    CheckFileDupSetting.sngDel++;

                    if (CheckFileDupSetting.GridView[2, i].Value.ToString() == "EMK")
                    {
                        CheckFileDupSetting.DelFile(CheckFileDupSetting.FolKara + "\\SONGS\\MIDI\\EMK\\" + CheckFileDupSetting.GridView[0, i].Value.ToString().Substring(0, 1) + "\\" + CheckFileDupSetting.GridView[0, i].Value.ToString() + ".emk");
                    }
                    else if (CheckFileDupSetting.GridView[2, i].Value.ToString() == "NCN")
                    {
                        CheckFileDupSetting.DelFile(CheckFileDupSetting.FolKara + "\\SONGS\\MIDI\\NCN\\Lyrics\\" + CheckFileDupSetting.GridView[0, i].Value.ToString().Substring(0, 1) + "\\" + CheckFileDupSetting.GridView[0, i].Value.ToString() + ".lyr");
                        CheckFileDupSetting.DelFile(CheckFileDupSetting.FolKara + "\\SONGS\\MIDI\\NCN\\Cursor\\" + CheckFileDupSetting.GridView[0, i].Value.ToString().Substring(0, 1) + "\\" + CheckFileDupSetting.GridView[0, i].Value.ToString() + ".cur");
                        CheckFileDupSetting.DelFile(CheckFileDupSetting.FolKara + "\\SONGS\\MIDI\\NCN\\Song\\" + CheckFileDupSetting.GridView[0, i].Value.ToString().Substring(0, 1) + "\\" + CheckFileDupSetting.GridView[0, i].Value.ToString() + ".mid");
                    }

                }
                CheckFileDupSetting.SongCheck = CheckFileDupSetting.SongCheck + (i - _Min);
                CheckFileDupSetting.labelInvoke.Invoke(new Action(() => { CheckFileDupSetting.labelInvoke.Text = "Song All:" + (CheckFileDupSetting.GridView.RowCount - 1) + " Song Check:" + CheckFileDupSetting.SongCheck + " Song Delete:" + CheckFileDupSetting.sngDel + " Cri:" + cri; }));
                System.Threading.Thread.Sleep(5);
            }


        }

    }
}