public static SqlDataReader ExecuteReader(string connString, CommandType cmdType, string cmdText, params SqlParameter[] cmdParms)        {            SqlCommand cmd = new SqlCommand();            SqlConnection conn = new SqlConnection(connString);            try            {                PrepareCommand(cmd, conn, null, cmdType, cmdText, cmdParms);                SqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection);                cmd.Parameters.Clear();                return rdr;             }            catch (Exception ex)            {                conn.Close();                throw ex;            }        }  怎樣修改好呢，現(xiàn)在發(fā)現(xiàn)經(jīng)常有超時(shí)的現(xiàn)象，數(shù)據(jù)庫(kù)連接池已滿的現(xiàn)象