Can you clarify whether you are using the Classic RadAjax or RadAjax for ASP.NET AJAX? If the Classic one, you can pass an argument depending on whether there is new data or not and cancel the ajax request if there is no data (help article here
). Another option would be using the ResolveUpdatedControls eventhandler
and clear the updated controls collection on your condition.
If you are using RadAjax for ASP.NET AJAX, you can hook up to AjaxSettingCreating and cancel the creation of the updatePanels for the grids based on your condition.
the Telerik team