How to do Page Validation?

Hi Experts!

I think this is a fairly simple question but I am not sure of the best way to do it.  I have required field and expression validators on all of my user input text boxes on a form.  The validators fire upon clicking a SUBMIT button which has "causes validation"  set to true.  I currently display a * next to any required field that was missed by using the required field validators but I would also like to display a label or message box if any of the validators fire that tells the user to re-check the form for missed fields.

my thoughts were something like this:

Private Sub btnSubmit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSubmit.Click
        If Page.IsValid Then
'Insert data
else
lblError.visible = true
end Sub

I may not understand the correct way to use Page.IsValid or if anyone has a better way to do this please let me know..
Thanks!!
jcraunAsked:
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thrill_houseCommented:
You can actually do it rather easy by adding a Validation Summary control.

Just add this to your html side: <asp:ValidationSummary id="ValidationSummary1" runat="server" ShowSummary="False" ShowMessageBox="True"></asp:ValidationSummary>

Now the error messages will show up in a message box as well as put the * next to the problem.
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