| 对象
There isn''''t anything special about instantiating a DataSet. You just create a new instance, just like any other object:
实例化DataSet没有任何特别的内容，你应该创建一个新的实例，就像其它对象一样：
DataSet dsCustomers = new DataSet();
The DataSet constructor doesn''''t require parameters. However there is one overload that accepts a string for the name of the DataSet, which is used if you were to serialize the data to XML. Since that isn''''t a requirement for this example, I left it out. Right now, the DataSet is empty and you need a SqlDataAdapter to load it.
DataSet构造函数并不需要参数。然而当你将数据序列化为XML的时候为了得到DataSet的名字却有额外的负担。因为在这个例子中并不需要，我就不提了。现在数据集为空并且你需要SqlDataAdapter来装载它。
Creating A SqlDataAdapter
创建SqlDataAdapter
The SqlDataAdapter holds the SQL commands and connection object for reading and writing data. You initialize it with a SQL select statement and connection object:
SqlDataAdapter使用SQL命令和连接对象来读写数据。对它进行初始化使用SQL选择语句和连接对象。
SqlDataAdapter daCustomers = new SqlDataAdapter(
"select CustomerID, CompanyName from Customers", conn);
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