DataTable快速添加行
如題所描述的，能快點添加一行DataRow
------最佳解决方案--------------------
 dtSearch = dt.Clone();
  foreach (DataRow item in dr)
                {
                    DataRow newdr = dtSearch.NewRow();
                    newdr.ItemArray = item.ItemArray;
                    dtSearch.Rows.Add(newdr);
                }