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單項選擇題

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); }

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