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You create a Web page named TestPage.aspx and a user control named contained in a file named TestUserControl.ascx.You need to dynamically add TestUserControl.ascx to TestPage.aspx. Which code segment should you use?()

A. protected void Page_Load(object sender, EventArgs e) { Control userControl=Page.LoadControl("TestUserControl.ascx"); Page.Form.Controls.Add(userControl); }
B. protected void Page_Load(object sender, EventArgs e) { Control userControl = Page.FindControl("TestUserControl.ascx"); Page.Form.Controls.Load(userControl); }
C. protected void Page_PreInit(object sender, EventArgs e) { Control userControl =Page.LoadControl("TestUserControl.ascx");Page.Form.Controls.Add(userControl); }
D. protected void Page_PreInit(object sender, EventArgs e) { Control userControl = Page.FindControl("TestUserControl.ascx"); Page.Form.Controls.Load(userControl); }

什么情况应重新绘制竣工图?

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