Can a page have multiple ScriptManager? If so, under what conditions will it be required?
MSDN says no, you cannot have more than one (emphasized by me):
A page can contain only one ScriptManager control in its hierarchy. To register services and scripts for subpages, controls, or components when the parent page already has a ScriptManager control, use the ScriptManagerProxy control. For more information, see Using the ASP.NET UpdatePanel Control with Master Pages
ASP ScriptManager.
ASP ScriptManager ScriptManager ... "" , , ASP ScriptManager. .. Telerik RadScriptManager.
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