I am developing a web application in which i m facing problem of dropdown residing inside user control is not updated. Overview of Entire Problem. As per my and client's requirement: I've created two user control. One user control having a drop down. Another user control having few no of controls and its event. Both user control i've used in my one web page twice. For partial postback use following AjaxSettings. <telerik:RadAjaxManager ID="RadAjaxManager1" DefaultLoadingPanelID="RadAjaxLoadingPanel1" runat="server"> <AjaxSettings> <telerik:AjaxSetting AjaxControlID="btnSave"> <UpdatedControls> <telerik:AjaxUpdatedControl ControlID="FilterDropDown" /> <telerik:AjaxUpdatedControl ControlID="FilterDropDownGridContact" /> </UpdatedControls> </telerik:AjaxSetting> </AjaxSettings> </telerik:RadAjaxManager> <telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server"> </telerik:RadAjaxLoadingPanel> Now concentrate here, btnSave is asp server side button residing inside in second user control. And as I told both user control i've used in my same page twice. FilterDropDown and FilterDropDownGridContact is two user control.(having only a drop down) Now when I click on btnSave of first user control event fires and as per ajax setting dropdown user control updates. But, when I click on btnSave of second user control events fires but user control is not updated. So, Whats issue?? Is there any way, so that i can update ajax setting such as update first user control when respective user control's btnSave fires and so on.