| raction by using the DataSet and SqlDataAdapter objects.
在第三课中，我们讨论了使用Sqlcommand对象的与数据源的完全连接操作模型。在第四课，我们学习了如何通过连接使用SqlDataReader快速的读取数据。这节课介绍如何通过使用DataSet和SqlDataAdapter来实现SqlConnection和SqlDataReader交互之间的事情。
A DataSet is an in-memory data store that can hold numerous tables. DataSets only hold data and do not interact with a data source. It is the SqlDataAdapter that manages connections with the data source and gives us disconnected behavior. The SqlDataAdapter opens a connection only when required and closes it as soon as it has performed its task. For example, the SqlDataAdapter performs the following tasks when filling a DataSet with data:
DataSet是存储在内存中的数据，它保存了大量的表。DataSet只存储数据而并不与数据源发生交互。它通过SqlDataAdapter来管理与数据源的连接并给予我们非连接的行为。只有当需要的时候，SqlDataAdapter打开连接并在完成任务后关闭它。比如，当Data填充数据的时候SqlDataAdapter执行以下的操作：
- Open connection
- Retrieve data into DataSet
- Close connection
1． 打开连接
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