Occurs when a significant action occurs in Delete(String, TraversalMode) method. Notifies the client about currently processing directory, currently deleting file and progress of the delete.

Occurs when a fingerprint is received from the server and needs to be validated.

Occurs when a file and directory listing item is received by the GetList()()()(), GetRawList()()()(), GetNameList()()()() or GetItems(String) methods. Notifies the client about currently processed item.

Occurs when a problem is detected in Download(String, String), Upload(String, String), Delete(String, TraversalMode) or GetItems(String) methods, making it possible for the handler to choose a desired reaction.

Occurs when a significant action occurs in Download(String, String), Upload(String, String) methods. Notifies the client about currently processing directory, currently transferring file and progress of the transfer.

Occurs when a significant action occurs in Download(String, String), Upload(String, String), Delete(String, TraversalMode) or GetItems(String) methods. Notifies the client about traversing hierarchy structure.

Occurs when an FTP/SSL server certificate needs to be validated.