You want to open an XML socket with flash which writes a message saying the movie is complete and tell C# to listen for this message so it can handle it and clear XML message.
Hope this helps,
Thank you for your response.
Do you have a code snippet or other example that shows how to do this?
I never tried the previous poster example, but I'll give you an alternative too.
I don't know what you really need it for but I do use C# with Flash (I'm a C# programmer).
I mostly use handlers (.ashx files in C#) in which I pass parameters (http://mysite.com/myHandler.ashx?complete=1). Then the handler can executes commands with the QueryString you just passed.
The handler can also receive XML files, images or such from flash (but I don't think you need that from what I read). This is to pass objects which can't be put into the url (short text).