DataTable 轉List
List<DataRow > RtimeList;
DataTable dt= db.ExecuteDataSet(dbCommand).Tables[0];
//資料表取得的內容
ColumnName ColumnName1
1 A
2 B
3 C
RtimeList =dt.AsEnumerable().ToList();
//從List取得欄位值
string strRTime = RtimeList.Find(dr => dr["ColumnName"].ToString() ==@Value )["ColumnName1"].ToString();