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This has not happened to me before, but for some reason both the client and server side validation events are not being triggered: <asp:TextBox ID="TextBoxDTownCity" runat="server" CssClass="contactfield" /> <asp:CustomValidator ID="CustomValidator2" runat="server" EnableClientScript="true" ErrorMessage="Delivery Town or City required" ClientValidationFunction="TextBoxDTownCityClient" ControlToValidate="TextBoxDTownCity" OnServerValidate="TextBoxDTownCity_Validate" Display="Dynamic" > </asp:CustomValidator> Server-side validation event: protected void TextBoxDTownCity_Validate(object source, ServerValidateEventArgs args) { args.IsValid = false; } Client-side validation event: function TextBoxDCountyClient(sender, args) { args.IsValid = false; alert("test"); } I thought at the least the Server Side validation would fire but no. this has never happened to me before. This has really got me stumped. I looked at the output and ASP.NET is recognizing the client side function: ASP.NET JavaScript output: var ctl00_ctl00_content_content_CustomValidator2 = document.all ? document.all["ctl00_ctl00_content_content_CustomValidator2"] : document.getElementById("ctl00_ctl00_content_content_CustomValidator2"); ctl00_ctl00_content_content_CustomValidator2.controltovalidate = "ctl00_ctl00_content_content_TextBoxDTownCity"; ctl00_ctl00_content_content_CustomValidator2.errormessage = "Delivery Town or City required"; ctl00_ctl00_content_content_CustomValidator2.display = "Dynamic"; ctl00_ctl00_content_content_CustomValidator2.evaluationfunction = "CustomValidatorEvaluateIsValid"; ctl00_ctl00_content_content_CustomValidator2.clientvalidationfunction = "TextBoxDTownCityClient"; Rendered custom validator: <span id="ctl00_ctl00_content_content_CustomValidator2" styl

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