Viewing source for recipe0106vb.aspx
<%@ Page %>
<script runat="server" language="VB">
Sub btnToggle_Click(sender as object, e as EventArgs)
pnlSample.Visible = Not pnlSample.Visible
End Sub
</script>
<html>
<body>
<form runat="server">
<asp:panel id="pnlSample" runat="server">
<asp:Label id="lblSample" runat="server" Text="Sample Text" />
</asp:panel>
<asp:button runat="server" id="btnToggle" Text="Toggle Panel Visibility" OnClick="btnToggle_Click" />
</form>
</body>
</html>