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if there is validation error in input box, then how to change its parent

tag background Posted By:      Posted Date: September 19, 2010    Points: 0   Category :ASP.Net 

If there is validation error in input box, then how to change its parent <td> tag background-color?

<td id="td1">
                                    <asp:RequiredFieldValidator ID="rfvtxtName" runat="server" ErrorMessage="Specify your Name."
                                        ControlToValidate="txtName" Display="Dynamic" ValidationGroup="vgSubmit" 
                                        CssClass="fieldError" SetFocusOnError="True"></

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