I need to use mysql with my C# app. If I want to share my app, the connection can come from any IP Address. How do I allow everyone no matter where it's used?
I would like to suggest here, it's not a good practice to accept request from any IP.
Answer for your question is:
GRANT <set of privileges> on <schema>.<table/*> TO <user>@'%' IDENTIFIED BY PASSWORD <password> it can allow to receive connections through specific from any source.