>I have a little question. I create a COM object to process a long time job. During the process, the client didn't have any indication the progress of the process. How can I show the progress bar on the client or some indication to indicate the process in progress?

For maybe the easiest solution, you would have to couple the object and its caller. Have the caller create a progress bar of sometype and pass it to the COM who then updates the progress bat inside its long process.