Question

I have a simple ASP.NET (VB) page with a CompareValidator. I can check to ensure the value is numeric, but I have no idea how to check for the length (business rules require a 7 digit number). Existing code is below:

<asp:TextBox ID="txtPolicyNo" runat="server" 
                    BorderStyle="Ridge"></asp:TextBox>

<asp:CompareValidator ID="cvCheckPolicy" runat="server" 
                    ErrorMessage="Must be a valid policy number" ControlToValidate="txtPolicyNo" 
                    Type="Integer" Operator="DataTypeCheck">
</asp:CompareValidator>

How can I accomplish this?

Thanks,

Jason

Answer 1

Use a RangeValidator or RegularExpressionValidator

<asp:RangeValidator id="rvCheckPolicy"
   ControlToValidate="txtPolicyNo" 
   MinimumValue="1000000"
   MaximumValue="9999999"
   Type="Integer"
   EnableClientScript="false"
   ErrorMessage="Must be a valid policy number" 
   runat="server"/>

<asp:RegularExpressionValidator id="revCheckPolicy" 
    ControlToValidate="txtPolicyNo" 
    ValidationExpression="\d{7}"
    ErrorMessage="Must be a valid policy number" 
    runat="server"/>