Make UserControl Visible after Logging In - vb.net

Question

I have a popup login usercontrol in a masterpage, once logged in I want another usercontrol on a content page to appear automatically, currently it only appears if I manually refresh the page. How can this be accomplished. Thanks.
MasterPage - > login usercontrol
View.aspx - > bookmark usercontrol (should appear after logging in)
login usercontrol in Master Page
<asp:UpdatePanel ID="login" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Panel ID="pnlLogin" runat="server">
<asp:TextBox ID="txtpassword" runat="server" TextMode="Password </asp:TextBox>
<asp:Button ID="btbookmark" runat="server" Text="Login" OnClick="btbookmark_Click"/>
</asp:Panel>
<asp:Panel ID="pnlData" runat="server">Placeholder for bookmark data. Bookmark data goes here.
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
Bookmark usercontrol on View.aspx
<asp:TextBox ID="txtbookmark" runat="server"></asp:TextBox><br />
<asp:Button ID="btmark" runat="server" />
After logging in how can the Bookmark usercontrol on View.aspx appear. Do I need to use an updatepanel?

Answer 1

You could either register it and set the Visible property to false in the code behind, until the user has logged in, and then you set the property to true. You will need to add code to prevent a lot of processing if the user session object doesn't exist.
aspx:
<%# Register TagPrefix="control" TagName="UserBookmarks" Src="~UserBookmarks.ascx" %>
<control:UserBookMarks ID="UserBookmarksCtrl" runat="server" Visible="false" />
code behind:
// If user logged in
UserBookmarksCtrl.Visible = True
Or, you can dynamically create the control, and add it to your page once a user has logged in (i.e. something like Session["user"] has been set).