private void BtnImportExelClick(object sender, EventArgs e)
        {
            if(_frmNhapExcel == null || _frmNhapExcel.IsDisposed)
            {
                _frmNhapExcel = new frmNhapExcel();
            }
            else
            {
                _frmNhapExcel.OnImportFinish -= FrmNhapExcelOnOnImportFinish;
                _frmNhapExcel.OnImportProcess -= FrmNhapExcelOnOnImportProcess;

                _frmNhapExcel.Dispose();
                _frmNhapExcel = null;
                _frmNhapExcel = new frmNhapExcel();
            }

            ErrLst.Clear();
            _frmNhapExcel.OnImportFinish += FrmNhapExcelOnOnImportFinish;
            _frmNhapExcel.OnImportProcess += FrmNhapExcelOnOnImportProcess;
            _frmNhapExcel.Show();
        }
        private void BtnImportExelClick(object sender, EventArgs e)
        {
            if (_frmNhapExcel == null || _frmNhapExcel.IsDisposed)
            {
                _frmNhapExcel = new frmNhapExcel();
            }
            else
            {
                _frmNhapExcel.OnImportFinish  -= FrmNhapExcelOnOnImportFinish;
                _frmNhapExcel.OnImportProcess -= FrmNhapExcelOnOnImportProcess;

                _frmNhapExcel.Dispose();
                _frmNhapExcel = null;
                _frmNhapExcel = new frmNhapExcel();
            }

            ErrLst.Clear();
            _frmNhapExcel.OnImportFinish  += FrmNhapExcelOnOnImportFinish;
            _frmNhapExcel.OnImportProcess += FrmNhapExcelOnOnImportProcess;
            _frmNhapExcel.Show();
        }
        /// <summary>
        /// Hàm xử lý nút nhập dữ liệu từ file excel
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnBtnImportExcelMouseClick(object sender, EventArgs e)
        {
            if (_frmNhapExcel == null || _frmNhapExcel.IsDisposed)
            {
                _frmNhapExcel = new frmNhapExcel();
            }
            else
            {
                _frmNhapExcel.OnImportProcess -= OnImportProcess;
                _frmNhapExcel.OnImportFinish  -= OnImportFinish;

                _frmNhapExcel.Dispose();
                _frmNhapExcel = null;
                _frmNhapExcel = new frmNhapExcel();
            }

            _lstErr.Clear();
            _frmNhapExcel.OnImportProcess += OnImportProcess;
            _frmNhapExcel.OnImportFinish  += OnImportFinish;

            //_frmNhapExcel.ShowInTaskbar = false;
            _frmNhapExcel.ShowDialog();
        }
        /// <summary>
        /// Hàm xử lý nút nhập dữ liệu từ file excel
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void OnBtnImportExcelMouseClick(object sender, EventArgs e)
        {
            if (_frmNhapExcel == null || _frmNhapExcel.IsDisposed)
            {
                _frmNhapExcel = new frmNhapExcel();
            }
            else
            {
                _frmNhapExcel.OnImportProcess -= OnImportProcess;
                _frmNhapExcel.OnImportFinish -= OnImportFinish;

                _frmNhapExcel.Dispose();
                _frmNhapExcel = null;
                _frmNhapExcel = new frmNhapExcel();
            }

            _lstErr.Clear();
            _frmNhapExcel.OnImportProcess += OnImportProcess;
            _frmNhapExcel.OnImportFinish += OnImportFinish;

            //_frmNhapExcel.ShowInTaskbar = false;
            _frmNhapExcel.ShowDialog();
        }