Message in Spanish (Español)

Se ha devuelto un valor null de un método 'Begin' asincrónico o se ha pasado a un AsyncCallback. Las implementaciones de 'Begin' asincrónicas deben devolver un IAsyncResult que no sea null y pasar el mismo objeto IAsyncResult que el parámetro a AsyncCallback.

Unlocalized message

A null value was returned from an async 'Begin' method or passed to an AsyncCallback. Async 'Begin' implementations must return a non-null IAsyncResult and pass the same IAsyncResult object as the parameter to the AsyncCallback.

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