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ASPxTextBox - How to implement custom validation and change error text based on a certain condition

created 7 years ago

How show/activate the dx:ASPxTextBox ValidationSettings ErrorText frome Code Behind?

I use dx:ASPxTextBox to check if email exist before input and i want to show the ErrorText frome Code Behind and different ErrorText if  Email address already exists

This work fine: tbEmail.BackColor = Color.LightYellow

ASPx
<dx:ASPxTextBox ID="tbEmail" MaxLength="50" Width="240px" Caption=" " EnableClientSideAPI="True" ClientInstanceName="Email" NullText="E-mail" HelpText="E-mail" HelpTextSettings-DisplayMode="Popup" ValidationSettings-ErrorTextPosition="Right" runat="server">  
    <ValidationSettings ErrorDisplayMode="ImageWithText" Display="Dynamic" ErrorFrameStyle-ImageSpacing="0">  
        <ErrorImage Url="../images/thumb/varning_red.png" />  
        <RegularExpression ErrorText="Incorrect email address" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" />  
        <RequiredField IsRequired="True" ErrorText="E-mail is required" />  
    </ValidationSettings>  
    <InvalidStyle BackColor="LightYellow" />  
    <CaptionSettings Position="right" />  
</dx:ASPxTextBox>
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Answers approved by DevExpress Support

created 7 years ago

Hello,

You can implement custom validation using the approach described in the How to: Implement a Custom Validation article. To display custom error text, use the client-side ASPxClientTextBox.SetErrorText method.
Let us know if you have any further questions.

Best regards,
Stanley

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