Mobile Control ASP.Net

<%@ Page 
    Inherits="System.Web.UI.MobileControls.MobilePage" 
    Language="VB" 
%>
<%@ Register 
    TagPrefix="mobile" 
    Namespace="System.Web.UI.MobileControls" 
    Assembly="System.Web.Mobile" 
%>

Sub OK_OnSubmit(Sender As Object, E As EventArgs)
    If txtAnswer.Text = 35 Then
        ActiveForm = CorrectForm
    Else
        ActiveForm = IncorrectForm
    End If
End Sub

    id="QuestionPage" 
    runat="server">
            runat="server" 
        id="lbl1"
        Text="What is 5 x 7?" 
    />
            runat="server" 
        id="txtAnswer"
    />
            runat="server" 
        id="cmdOK"
        OnClick="OK_OnSubmit" 
        Text="OK" 
    />

    id="CorrectForm" 
    runat="server">
            runat="server" 
        id="lbl2"
        Text="You supplied the correct answer!" 
    />

    id="IncorrectForm" 
    runat="server">
            runat="server" 
        id="lbl3"
        Text="Your answer was not correct." 
    />