I need to show a screen or something, saying \'Loading\' or whatever while long process are working.
I am creating a application with the Windows Media Encoder SDK and i
There are many ways you could do this. The most simple might be to show a modal dialog, then kick off the other process, once it is completed you an then close the displayed dialog. You will need to handle the display of the standard X to close though. However, doing that all in the standard UI thread would lock the UI until the operation is complete.
Another option might be to have a "loading" screen that fills your default form, bring it to the front, then trigger the long running process on a secondary thread, once it is completed you can notify the UI thread and remove the loading screen.
Those are just a few ideas, and it really depends on what you are doing.