[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Gets a user-defined object that qualifies or contains information about an asynchronous operation.
Assembly: mscorlib (in mscorlib.dll)
This property returns the object that is the last parameter of the method that initiates an asynchronous operation.Notes to Implementers
Implement this property to allow the caller of an asynchronous operation to obtain an application-defined object that is specified at the start of the operation.Notes to Callers
This object can be used to pass state information for the asynchronous operation to an AsyncCallback that you provide.