复制表的行数据 DataSet DataTable

DataSet ds = new DataSet();
ds.ReadXml(Application.StartupPath.ToString() + "\\SystemConfig.xml");

DataTable dtt = new DataTable();
dtt=ds.Tables[0].Clone();
DataRow[] drs = ds.Tables[0].Select("Level='网络'");

foreach(DataRow dr in drs)
{
dtt.ImportRow(dr);
}
this.dataGrid1.DataSource =dtt;