Gets a value indicating whether the BeginInvoke call completed synchronously.
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 always returns false.