This method adds the provided
ThumbnailItem to the end of the collection. The display is updated if appropriate. This method throws an exception if item is not a directory and item.Filename specifies an invalid, unsupported, or non-existent file.
Parameters
- item
- The thumbnail to add.
- verify
- Validate the file name specified in item.FileName if the item is not a directory. This method throws an exception if item.Filename specifies an invalid, unsupported, or non-existent file.
Return Value
Returns the new count of total thumbnails.