Gets the server reply to a data upload operation started by calling an erload:System.Net.WebClient.UploadDataAsync method.
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You should check the System.ComponentModel.AsyncCompletedEventArgs.Error and System.ComponentModel.AsyncCompletedEventArgs.Cancelled properties before using the data returned by this property. If the System.ComponentModel.AsyncCompletedEventArgs.Error property's value is an Exception object or the System.ComponentModel.AsyncCompletedEventArgs.Cancelled property's value is true, the asynchronous operation did not complete correctly and the UploadDataCompletedEventArgs.Result property's value will not be valid.