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I am trying to do this:

<obout:OboutTextBox ID="txtDistributorEmail" runat="server" Width="250" />
    <asp:RegularExpressionValidator ID="revDistributorEmail" runat="server"     
    ErrorMessage="An invalid email address was entered."                                 
    ValidationExpression='<%=Mynamespace.RegEx.EMAIL %>' 
    ControlToValidate="txtDistributorEmail" />

namespace Mynamespace
{
    public class RegEx
    {
        public const string EMAIL = @"^([0-9a-zA-Z]([-\.\w]*[0-9a-zA-Z])*@([0-9a-zA-Z] 
        [-\w]*[0-9a-zA-Z]\.)+[a-zA-Z]{2,9})$";
    }
 }

The validation is failing even when a correct email is entered. But if I replace the ValidationExpression with the regular expression [], it works fine.

Is there anything in-correct I am doing?

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Have a look at how the ValidationExpression is getting rendered in your HTML. That should tell you a lot. –  Ann L. Sep 14 '12 at 20:23

1 Answer

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This goes on top of aspx page

<%@ Import Namespace="Mynamespace" %>  



<asp:RegularExpressionValidator ID="revDistributorEmail" runat="server"     
    ErrorMessage="An invalid email address was entered."                                 
    ValidationExpression="<%# Mynamespace.RegEx.EMAIL %>" 
    Display="Dynamic"
    ControlToValidate="txtDistributorEmail" />
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Ann, i see this in HTML that's rendered: revDistributorEmail.evaluationfunction = "RegularExpressionValidatorEvaluateIsValid"; revDistributorEmail.validationexpression = "<%=RegEx.EMAIL %>"; –  Kiran D Sep 14 '12 at 20:47
 
oh boy - right click on the .aspx page with that code , then click view source , then the page load part goes in there , not in the HTML - or are you using MVC? –  Scott Selby Sep 14 '12 at 20:50
 
that's what I did. right-click and view source and that's the rendered HTML on the web page. –  Kiran D Sep 14 '12 at 20:53
 
Also ur comment earlier doesn't make any sense, the whole idea was not to hard-code the regular expression in the code-behind, but to store them in a class that I can re-use. –  Kiran D Sep 14 '12 at 20:54
 
oohhhhh , I got it , hold on , I thought you wanted to be able to dynamically change - not reuse , I got it now , hold on –  Scott Selby Sep 14 '12 at 20:55
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