Gets a value that indicates whether the asynchronous operation has completed.
Assembly: mscorlib (in mscorlib.dll)
When this property is true, you can assume that it is safe to discard any resources you allocated for use by the asynchronous operation.Notes to Implementers
Implementers will typically return the value of a private field or internal test as the value of this property.Notes to Callers
Clients that poll for operation status (instead of waiting on a synchronization object) use this property to determine the status of the operation.