public IAsyncResult BeginReceiveFrom(byte[] buffer, int offset, int size, SocketFlags socketFlags, ref EndPoint remoteEP, AsyncCallback callback, object state)

{

...

this.DoBeginReceiveFrom(buffer, offset, size, socketFlags, endPoint, socketAddress, overlappedAsyncResult);

overlappedAsyncResult.FinishPostingAsyncOp(ref this.Caches.ReceiveClosureCache);

if (overlappedAsyncResult.CompletedSynchronously && !overlappedAsyncResult.SocketAddressOriginal.Equals(overlappedAsyncResult.SocketAddress))

{

    try

    {

        remoteEP = endPoint.Create(overlappedAsyncResult.SocketAddress);

    }

    catch

    {

    }

}

...

}