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Editorial Team
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Asked: 2026-05-14T15:16:42+00:00

I have created the TextBox and CompareValidator below which I thought would allow input

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I have created the TextBox and CompareValidator below which I thought would allow input in the following forms:

  • 5
  • 5.00
  • $5.00

Unfortunately it’s not allowing the version with the dollar sign in it. What is the point of doing a type check against currency if you don’t allow the dollar sign? Is there a way to allow this symbol?

            <asp:TextBox ID="tb_CostShare" runat="server" Text='<%# Eval("CostShare", "{0:$0.00}")%>' CausesValidation="true" />
            <asp:CompareValidator   ID="vld_CostShare" 
                                    runat="server" 
                                    ControlToValidate="tb_CostShare" 
                                    Operator="DataTypeCheck" 
                                    Type="Currency" 
                                    ValidationGroup="vld" 
                                    ErrorMessage="You must enter a dollar amount for 'Cost Share'." />
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1 Answer

  1. Editorial Team

    The CompareValidator doesn’t support currency symbols. You can prefix your input control with the $ or use a regular expression validator, this page has an example.

    The following pattern will match your examples (courtesy of http://www.regexlib.com):

    ^\$?([0-9]{1,3},([0-9]{3},)*[0-9]{3}|[0-9]+)(.[0-9][0-9])?$
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