Thank you for the detailed explanation.
In order to achieve the required functionality, you could use the RadAjaxSeviceManager control. Please review the following help topic
, which describes the control and its functionality. Also you could refer to these
online examples, showing some implementation of the ServiceManager control.
Please note that, if you decide to use the RadAjaxServiceManager and need to initiate synchronous Service Call, you should set the control "PerformAsyncronousRequests" property to "false", as it is set to "true" by default.
Let us know if the provided information is helpful.
the Telerik team