未能加载用户控件“<var>X</var>”。确保已生成包含该控件的库并已创建对包含该控件的库的项目引用。如果更改了用户控件的名称，请关闭并重新打开控件的设计器以更新工具箱项。

Message in Chinese (Simplified) (中文(简体))

Unlocalized message

The user control '<var>X</var>' could not be loaded. Ensure that the library containing the control has been built and a project reference has been made to the library containing the control. If you have changed the name of the user control, close and re-open the control's designer to update the toolbox item.

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