单选题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？（）Aprotected void Page_Load（object sender， EventArgs e） { Control userControl=Page.LoadControl（TestUserControl.ascx）； Page.Form.Controls.Add（userControl）； }Bprotected void Page_Load（object sender， EventArgs e） { Control userControl = Page.FindControl（TestUserControl.ascx）； Page.Form.Controls.Load（userControl）； }Cprotected void Page_PreInit（object sender， EventArgs e） { Control userControl =Page.LoadControl（TestUserControl.ascx）；Page.Form.Controls.Add（userControl）； }Dprotected void Page_PreInit（object sender， EventArgs e） { Control userControl = Page.FindControl（TestUserControl.ascx）； Page.Form.Controls.Load（userControl）； }
单选题
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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