<%@ Control %>
<script language="VB" runat="server">

Dim m_Secure As Boolean = False
Public WelcomeMessage As String = "Welcome"

Sub Login_Click(ByVal sender As Object, ByVal e As EventArgs)
    If UsernameValidator.IsValid And PasswordValidator.IsValid Then
        UnsecurePanel.Visible = False
        Message.Text = WelcomeMessage & ", " & UserName.Text
        SecurePanel.Visible = True
        m_Secure = True
    End If
End Sub

Sub Logout_Click(ByVal sender As Object, ByVal e As EventArgs)
    If UsernameValidator.IsValid And PasswordValidator.IsValid Then
            UnsecurePanel.Visible = True
            UserName.Text = ""
            Password.Text = ""
            SecurePanel.Visible = False
            m_Secure = False
    End If
End Sub  

Public Property Secure() As Boolean
        Get
            Return m_Secure
        End Get
        Set (ByVal Value As Boolean)
            m_Secure = Value
        End Set
End Property    
</script>
<asp:panel id="UnsecurePanel" runat="Server">
    <asp:label runat="server" font-size="9pt">Username: </asp:label>
    <br>
    <asp:textbox id="UserName" runat="server" />
    <br>
    <asp:requiredfieldvalidator id="UsernameValidator"
         runat="server"  controltovalidate="UserName"
         errormessage="Please enter a username" style="color: red; font-size: 8pt"  />
   <br>
    <asp:label runat="server" font-size="9pt">Password: </asp:label>
    <br>
    <asp:textbox id="Password" runat="server" textmode="Password" />
    <br>
    <asp:requiredfieldvalidator id="PasswordValidator" runat="server" 
         controltovalidate="Password"
         errormessage="Please enter a password"
         style="color: red; font-size: 8pt" />
    <br>
    <asp:button id="Login" text="Login" runat="server" onclick="Login_Click"/>
</asp:panel>
<asp:panel id="SecurePanel" runat="Server" visible="false"> 
    <asp:label id="Message" runat="server"/><br>
    <asp:linkbutton id="Logout" runat="server" onclick="Logout_Click" text="Logout" style="font-size: 8pt; color: blue;"/>
</asp:panel>