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    <p>The <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.validationsummary.showmessagebox.aspx" rel="nofollow noreferrer">ShowMessageBox</a> option is fully client-side, so it will only evaluate if you have set the <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.customvalidator.clientvalidationfunction.aspx" rel="nofollow noreferrer">ClientValidationFunction</a> on the <a href="http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.customvalidator.aspx" rel="nofollow noreferrer">CustomValidator</a>.</p> <p>You can also fake it by registering a script that makes an alert, so when you get back from the server's validation, it'll prompt with the error message. This can either be registered in the ServerValidate method (per <a href="https://stackoverflow.com/questions/811734/elegant-way-to-make-customvalidator-work-with-validationsummary-messagebox/811761#811761">@Jose Basilio</a>), or you can call the following method during the PreRender event to register a popup with all invalid validators on the page: </p> <pre><code> /// &lt;summary&gt; /// Registers a script to display error messages from server-side validation as the specified &lt;see cref="UserControl"/&gt; or &lt;see cref="Page"/&gt; loads from a postback. /// &lt;/summary&gt; /// &lt;remarks&gt; /// Must be called in the PreRender if used to validate against the Text property of DNNTextEditor controls, otherwise Text will not be populated. /// Must set the ErrorMessage manually if using a resourcekey, otherwise the resourcekey will not have overridden the ErrorMessage property. /// &lt;/remarks&gt; /// &lt;param name="ctrl"&gt;The &lt;see cref="UserControl"/&gt; or &lt;see cref="Page"/&gt; which is being posted back.&lt;/param&gt; /// &lt;param name="validationGroup"&gt;The validation group against which to validate.&lt;/param&gt; public static void RegisterServerValidationMessageScript(TemplateControl ctrl, string validationGroup) { if (ctrl != null &amp;&amp; ctrl.Page.IsPostBack) { ctrl.Page.Validate(validationGroup); if (!ctrl.Page.IsValid) { StringBuilder errorMessage = new StringBuilder("&lt;script language='javascript'&gt;alert('"); for (int i = 0; i &lt; ctrl.Page.Validators.Count; i++) { IValidator validator = ctrl.Page.Validators[i]; if (!validator.IsValid) { errorMessage.Append("- " + validator.ErrorMessage); if (i &lt; ctrl.Page.Validators.Count - 1) { errorMessage.Append(@"\r\n"); } } } errorMessage.Append("');&lt;/script&gt;"); ctrl.Page.ClientScript.RegisterStartupScript(typeof(IValidator), "validationAlert", errorMessage.ToString(), false); } } } </code></pre>
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    1. POElegant way to make CustomValidator work with ValidationSummary messagebox
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    1. COThanks A LOT! Works like a charm!
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    2. COonly problem is at the moment, I'm not allowed to render custom js.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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