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Editorial Team
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Asked: 2026-05-28T01:14:42+00:00

I have a basic form on my page with the following textbox and validator.

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I have a basic form on my page with the following textbox and validator. When the validator is visible, there is a background image that is displayed. I would also like to be able to change the border of the textbox. Is that possible? If not in the ascx file, would it be possible in Javascript?

<tr>
  <td class="FormLabel">First name*</td>
  <td class="FormInput">
    <asp:TextBox ID="txtFirstname" runat="server" Width="180" MaxLength="30" fieldname="FIRSTNAME" tablename="TblName"></asp:TextBox></td>
  <td class="FormValidation">
    <asp:RequiredFieldValidator ID="valFirstname" runat="server" ControlToValidate="txtFirstname" CssClass="ValidatorError">&nbsp;</asp:RequiredFieldValidator></td>
</tr>

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1 Answer

  1. Editorial Team

    If you would use a ValidatorCalloutExtender of the ASP.NET-Ajax-Control-Toolkit, this would be simple by applying an appropriate HighlightCssClass.

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