Forces any pending segments to be written to the output stream without closing it.
The Flush method forces the component to write the last created segment to the output stream and then flush the output stream.
This method returns a result code; 0 indicates success, while a non-zero error code indicates that this method encountered an error during its execution. If an error occurs, the GetLastError() method can be called to retrieve the associated error message. (Note: This method's result code can also be obtained by calling the GetLastErrorCode() method after it returns.)