If I want to convert that into VB.NET:

void CopyStream(Stream destination, Stream source) {
   int count;
   byte[] buffer = new byte[BUFFER_SIZE];
   while( (count = source.Read(buffer, 0, buffer.Length)) > 0)
       destination.Write(buffer, 0, count);
}

It gives:

Private Sub CopyStream(destination As Stream, source As Stream)
	Dim count As Integer
	Dim buffer As Byte() = New Byte(BUFFER_SIZE - 1) {}
	While (InlineAssignHelper(count, source.Read(buffer, 0, buffer.Length))) > 0
		destination.Write(buffer, 0, count)
	End While
End Sub

Can someone explain me what is this InlineAssignHelper syntax and where does it come from?