The Web service is called when a selection is made in the DropDownList control.

在 DropDownList 控件中执行选择的时候，调用 Web 服务。

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Calls the databind method of the DropDownList control to bind the data to the control.

调用DropDownList控件的databind方法把数据绑定到控件中。

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Other controls, such as the DropDownList, can also be bound to the data source controls.

其他控件(例如，DropDownList)也可以绑定到数据源控件。

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