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The OnClientResponseError event is fired when a server error occurs during the request. It allows the developer to choose the behavior if this happens. The event receives the following parameters:

  1. The RadToolTipManager instance that fired the event. Note that this is not the tooltip that is being shown, this reference should be obtained via the static getCurrent() method of the class

  2. Event arguments - this object exposes the set_cancelErrorAlert() method that can be used to prevent the alert with the error thrown from the server. It also has the get_errorMessage() method which holds only the message itself. This allows you to formulate a user friendly response or take an action accordingly without interrupting the workflow.

<script type="text/javascript">
    function OnClientResponseError(sender, args)
        alert("There was an error while retrieving the data: " + args.get_errorMessage() + " . Please try again later.");
        var current = Telerik.Web.UI.RadToolTip.getCurrent();
        if (current)
<telerik:RadToolTipManager RenderMode="Lightweight" ID="RadToolTipManager1" OnClientResponseError="OnClientResponseError">
    <WebServiceSettings Method="GetToolTipData" Path="ToolTipWebService.asmx" />
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