Displaying contents of a folder using ASP

I have coded a simple function to write "Folder Found" if the specified folder sFolderPath = Server.MapPath("bg") exists. However, I want to display the file names of the directory, for example: 2.jpg, 3.jpg and 4.jpg and then tell it if there are no images then to use a folder in the wwwroot called bg.
How would I do this?
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