asp.net - Can a page have multiple ScriptManagers? If yes then under what condition will it be required? -

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Is there a single page manager in a page? If so, in what situation would it be needed?

No, you can not be more than one (emphasis my):

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One page can contain only one script manager control in its hierarchy. To register services and scripts for nested pages, user controls or components, there is already a ScriptManager control on the parent page, use ScriptManagerProxy control for more information, ASP.NET UpdatePanel with the master page See Using Control


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