DataTable.Select 返回DataTable

/// <summary>
/// 返回新的DataTable
/// </summary>
/// <param name="dt">源数据DataTable</param>
/// <param name="condition">查询条件</param>
/// <returns></returns>
private DataTable GetNewDataTable(DataTable dt,string condition)
{
DataTable newdt = new DataTable();
newdt=dt.Clone();

方法一：
DataRow[] dr = dt.Select(condition);
for(int i=0;i<dr.Length;i++)
{
newdt.ImportRow((DataRow)dr[i]);
}
return newdt;//返回的查询结果
}

方法二：
DataRow[] rows = dt.Select(conditions);
foreach(DataRow row in rows)
{
newdt.Rows.Add(row.ItemArray);
}
return newdt;