Could not find an event named XYZ on associated control ABC for the trigger in Update Panel

PROBLEM

Could not find an event named <XYZ> on associated control <ABC> for the trigger in UpdatePanel

DESCRIPTION

"We have a button with ID “btnUpdateTitle” and in the AjaxSettings we have defined the Event for the button as “UpdateTitleButton_Click”. And the same Event is present in Code behind file as well.

But when we try to open the page in browser we are getting the error saying “Could not find an event on associated control for the trigger in UpdatePanel”.

<asp:Button ID="btnUpdateTitle" runat="server" CssClass="tab" OnClick="UpdateTitleButton_Click" Text="Update Title" />

<telerik:RadAjaxManager ID="RadAjaxManager1" EnableAJAX="true" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="btnUpdateTitle" EventName="UpdateTitleButton_Click">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="btnUpdateTitle" />
            </UpdatedControls>
    </AjaxSettings>
</telerik:RadAjaxManager>

  

SOLUTION

The EventName property accepts the exact server event name, but not the server event handler name.
In order to solve the error replace the event handler name with the server event name:

<asp:Button ID="btnUpdateTitle" runat="server" CssClass="tab" OnClick="UpdateTitleButton_Click" Text="Update Title" />
<telerik:RadAjaxManager ID="RadAjaxManager1" EnableAJAX="true" runat="server">
    <AjaxSettings>
        <telerik:AjaxSetting AjaxControlID="btnUpdateTitle" EventName="Click">
            <UpdatedControls>
                <telerik:AjaxUpdatedControl ControlID="btnUpdateTitle" />
            </UpdatedControls>
    </AjaxSettings>
</telerik:RadAjaxManager>

You may experience the same error with the asp:UpdatePanel control. In this case, you can apply again the same solution for it. The following table lists the default event names for some common ASP.NET components:
 

Control	Event Name
Button	Click
Calendar	SelectionChanged
CheckBox	CheckedChanged
GridView	SelectedIndexChanged
TextBox	TextChanged

Note: The EventName is an optional property and if it is not specified, all events of the control are AJAX-enabled.