Event Validation

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Please disregard the previous question of the same name. It got sent before I
was able to finish the question.

I'm developing a website using VS 2008. I've added a button from the toolbox
to one of my pages. The button should execute C# behind code when the user
clicks it. But when this action takes place I get the error message below.
The method UpdateUserAccount_Click (see code below) is never entered (didn't
hit a breakpoint). It doesn't seem advisable to disable event validation.
This is a common thing to do. So how did I get intangled with the event
validation issue???

Thanks, Neil

<asp:Button ID="UpdateUserAccount" runat="server" BorderStyle="Outset"
onclick="UpdateUserAccount_Click" Text="Update User Account"
ToolTip="Click this button to update your user account." />

protected void UpdateUserAccount_Click(object sender, EventArgs e)
{