English version of all error messages you can encounter while programming
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Localized version

Un appel asynchrone est déjà en cours. Il doit être mené à terme ou annulé avant que vous ne puissiez appeler cette méthode.
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English version

An asynchronous call is already in progress. It must be completed or canceled before you can call this method.
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Localized version
 French

Error category
 .Net Framework

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