private void DBInsert(object sender, RoutedEventArgs e)
        {
            if (mysqlDataSet == null)
            {
                return;
            }
            var dlg = new InsertDlg(mysqlDataSet.Tables[0].Columns);

            if (dlg.ShowDialog() == true)
            {
                var row   = mysqlDataSet.Tables[0].NewRow();
                int colId = 0;
                foreach (var itm in dlg.Items)
                {
                    if (itm.Value == null)
                    {
                        row[colId] = DBNull.Value;
                    }
                    else
                    {
                        row[colId] = itm.Value;
                    }
                    colId++;
                }
                mysqlDataSet.Tables[0].Rows.Add(row);
                mysqlAdapter.Update(mysqlDataSet);
                MessageBox.Show("Inserted!");
            }
        }
        private void ExcelAddNew(object sender, RoutedEventArgs e)
        {
            if (excelView == null)
            {
                return;
            }
            var dlg = new InsertDlg(excelView.Table.Columns);

            if (dlg.ShowDialog() == true)
            {
                var row   = excelView.Table.NewRow();
                int colId = 0;
                foreach (var itm in dlg.Items)
                {
                    if (itm.Value == null)
                    {
                        if (excelView.Table.Columns[colId].DataType == typeof(string))
                        {
                            row[colId] = "";
                        }
                        else
                        {
                            row[colId] = Activator.CreateInstance(excelView.Table.Columns[colId].DataType);
                        }
                    }
                    else
                    {
                        row[colId] = itm.Value;
                    }
                    colId++;
                }
                excelView.Table.Rows.Add(row);
                excelAdapter.Update(excelDataSet);
                MessageBox.Show("Finished!");
            }
        }