Assembly: mscorlib (in mscorlib.dll)
If it is detected that the BeginInvoke call completed synchronously in the AsyncCallback delegate, it is probable that the thread that called BeginInvoke is the current thread. Most providers of the IAsyncResult interface will not use the capability and will return a default false.
Current implementation of CompletedSynchronously always returns false.
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.