What happens to my Non-B visa after resigning from my school in Thailand?

The original poster is concerned about the status of their Non-B visa after resigning from a position at a school. Responses indicate that the Non-B visa itself generally cannot be canceled; it remains valid until its expiry, which is tied to the entry stamp. The visa will not be specifically canceled by the school upon resignation unless there is an associated work permit. The key takeaway is that once the individual leaves Thailand, the Non-B visa will no longer be valid.