C#数据库升序、降序排列数据，对联合查询后的结果进行排序，在SQL语句中经常用到对读取到的数据集进行排序的问题，本例是在联合查询后进行的数据库升序排列和降序排列，有兴趣的可一看。-C# database Ascending, Descending data, to sort the results in the union query, sort of read data set is often used in SQL statements, this case is the union q