I've done this exact thing just recently in an application that I've been refactoring, to make explicit the actual meaning of the code sans comments:

<!-- language: c# -->

 protected void PaymentButton_Click(object sender, EventArgs e)
 Func<bool> HaveError = () => lblCreditCardError.Text == string.Empty && lblDisclaimer.Text == string.Empty;

 CheckInputs();

 if(HaveError())
 return;

 ...
 }