动态调用用户控件

aspx页中

    <form id="form1" runat="server">
        <asp:PlaceHolder ID="place" runat="server"></asp:PlaceHolder>
    </form>

aspx.cs文件中

    protected void Page_Load(object sender, EventArgs e)
    {
        int i = 9;
        if (i > 0)
        {
            Response.Write("哈哈哈哈哈哈。。。。。成功喽！");
        }
        else
        {
            Control myControl = Page.LoadControl("City_CommentOpe.ascx");
            place.Controls.Add(myControl);
        }
    }