Validation of currency amount enetred in a textbot in windows application

I have a textbox in Windows application in which the user enters a dollar amount. How can I make sure that it is a valid amount.  I am wondering that the user may enter  a decimal with comma, period or $ in it. So how can I validate that it iis a valid dollar amount. Any regex for this? Please help. Thanks
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Carl TawnConnect With a Mentor Systems and Integration DeveloperCommented:
You could use something like the following (note i'm only using a CultureInfo to force it to validate as US):
            string dollarAmount = "$123,456.99";

            System.Globalization.NumberStyles styles = System.Globalization.NumberStyles.AllowCurrencySymbol | System.Globalization.NumberStyles.AllowDecimalPoint | System.Globalization.NumberStyles.AllowThousands;
            decimal decAmount = decimal.Parse(dollarAmount, styles, new System.Globalization.CultureInfo("en-US"));

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Carl TawnSystems and Integration DeveloperCommented:
Or, in VB:
        Dim dollarAmount As String = "$123,456.99"

        Dim styles As System.Globalization.NumberStyles = Globalization.NumberStyles.AllowCurrencySymbol Or Globalization.NumberStyles.AllowDecimalPoint Or Globalization.NumberStyles.AllowThousands
        Dim decAmount As Decimal = Decimal.Parse(dollarAmount, styles, New System.Globalization.CultureInfo("en-US"))

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Éric MoreauSenior .Net ConsultantCommented:
TrialUserAuthor Commented:
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