在2.0版本中，所有控件无论有什么样的实际实现过程和用户界面特点，均从同一个基类(basedataboundcontrol类)派生。

In version 2.0, all controls derive from the same base class (the BaseDataBoundControl class), regardless of the actual implementation or user interface characteristics.

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该库还提供基客户端对象类型 组件、 控件和 行为类，可以从这些类进行派生以提供丰富的客户端功能。

The library also provides the base client object types Component, Control, and Behavior classes from which you can derive to provide rich client functionality.

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