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Following error I'm getting:

Uncaught Sys.WebForms.PageRequestManagerParserErrorException: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
Posted

The action that causes this code to execute MUST be a postback event, and not an AJAX call. This is due to the nature of the way AJAX requests are processed.
Check Sys.WebForms.PageRequestManagerParserErrorException - what it is and how to avoid it[^]

Hope it helps!

--Amit
 
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I added
C#
if (Session.SessionID == "")
        {
            Page.Session.Add("SessionID", Session.SessionID);
        }


in Page Load.
 
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