内容页控制母版页按钮的显示与否

母版页前台：

<asp:Button ID="btnRegistor" runat="server" Text="去注册" />

内容页前台：

 <asp:Button ID="Button1" runat="server" Text="变"
         Xonclick="Button1_Click" /></p>

内容页后台：

protected void Button1_Click(object sender, EventArgs e)
        {
           Button btn= this.Master.FindControl("btnRegistor") as Button;
           btn.Visible = false;
        }