private void btnGroup_Click(object sender, EventArgs e)
        {
            FolderBrowserDialog Folder = new FolderBrowserDialog();

            Folder.SelectedPath = this.lastPath;

            if (Folder.ShowDialog() == DialogResult.OK)
            {
                this.lastPath = Folder.SelectedPath;
                List <string> FILEs = ShiftFileNames(Directory.GetFiles(lastPath).ToList());
                if (FILEs.Count > 0)
                {
                    TransCoordinateSystem TCS = new TransCoordinateSystem();
                    foreach (string file in FILEs)
                    {
                        string SaveFileName = Path.GetFileNameWithoutExtension(file) + "_圖號座標轉換.xlsx";
                        TCS.Main_start(file, lastPath, SaveFileName);
                    }
                    MessageBox.Show("檔案處理完成!");
                    this.Saveing();
                    return;
                }

                MessageBox.Show("無excel檔案!");
            }
            ;
        }
        private void btnSingle_Click(object sender, EventArgs e)
        {
            OpenFileDialog dialog = new OpenFileDialog();

            dialog.Title  = "選擇excel檔案";
            dialog.Filter = "xlsx files (*.*)|*.xlsx";
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                string SavePath     = Path.GetDirectoryName(dialog.FileName);
                string SaveFileName = this.txtSingleFileName.Text.Trim() == "" ?
                                      (Path.GetFileNameWithoutExtension(dialog.FileName) + "_圖號座標轉換.xlsx") :
                                      this.txtSingleFileName.Text + "_圖號座標轉換.xlsx";
                TransCoordinateSystem TCS = new TransCoordinateSystem();
                TCS.Main_start(dialog.FileName, SavePath, SaveFileName);
                MessageBox.Show("檔案處理完成!");
            }
        }