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A class of the System.Web.UI namespace, the UpdatePanel Enables sections of a page to be partially rendered without a postback.

1 vote

Uncaught Sys.ArgumentNullException: Sys.ArgumentNullException: Value cannot be null. Paramet...

This is because of the post-back events, one of the validation seems to be failed on your page before the event happens, i recommend to identify it and try fixing it.
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