I managed to do this by running the following code just before setting CancelAction = true string JavaScriptString = ""; HttpContext.Current.Response.Write(String.Format(JavaScriptString, "error message")); /Christoffer

Hi Christoffer! Im afraid that there is no supported way to "send" an error message back to the user, PageEventArgs doesnt contain such a "channel". A somewhat "hacky" (and thus unsupported) way to accomplish this would be to use HttpContext.Current.Handler and register some javascript to be executed when page loads. Something like this: protected static void OnMovingPage(object sender, PageEventArgs e) { e.CancelAction = true; if (null != HttpContext.Current) { Page page = HttpContext.Current.Handler as Page; if (null != page) { page.ClientScript.RegisterClientScriptBlock(typeof(debug), "message", @" <SCRIPT type=text/javascript><![CDATA[ window.attachEvent('onload', function () { alert('Couldnt delete page because....'); }); ]]></SCRIPT> "); } } } Note that you have to check HttpContext.Current.Handler for validity, as the MovingPage event might be triggered from scheduled jobs or other background threads running without user intervention. Best regards, Johan Olofsson EPiServer AB