是的，我们可以.要进行访问，您需要使用FindControl()方法.
即

yes we can. for accessing you need to use the FindControl() method.
i.e.

CType(ucTest.FindControl("txt_Test"),TextBox).Text = "Text Set from parent Control"

希望这能帮助您理解.

hope this will help you understanding.

您好

这可以帮助您

http://www.codeproject.com/Answers/268500/how-to-find-event-source-in-Page-load#answer1

Hi

This May help you

http://www.codeproject.com/Answers/268500/how-to-find-event-source-in-Page-load#answer1