By default, a business item of type Text is added to the connection to indicate a data flow.
缺省情况下，将向连接添加text类型的业务项以指示数据流。
Data Sources window, there is a default control that is created when you drag the item to the designer.
资料来源视窗中的每个资料型别都有一个预设的控制项，这个控制项是在您将项目拖曳到设计工具时建立的。
Data Sources window onto a design surface without selecting a control, the default control for the data type of the selected item is added to the design surface.
“数据源”窗口拖至设计图面上，则会将选定项的数据类型对应的默认控件添加到设计图面中。
Data Sources window onto a design surface without selecting a control, the default control for the data type of the selected item is added to the design surface.
“数据源”窗口拖至设计图面上，则会将选定项的数据类型对应的默认控件添加到设计图面中。
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