ASP.NET AJAX PageRequestManager EndRequestHandler pass argument from server

I'm wondering if there is a way to modify th开发者_JS百科e arguments retrieved by the EndRequestHandler to include a boolean flag (set on the server side during a partial update).

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Try this:

"ScriptManager instance".RegisterDataItem(this, "value");

http://msdn.microsoft.com/en-us/library/bb301423.aspx