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Represents the status of an asynchronous operation.
Assembly: mscorlib (in mscorlib.dll)
The interface is implemented by classes containing methods that can operate asynchronously. It is the return type of methods that initiate an asynchronous operation, and it is passed to methods that conclude an asynchronous operation.
An object that supports the interface stores state information for an asynchronous operation and provides a synchronization object to allow threads to be signaled when the operation completes.