When should I open and close a connection to SQL Server

Question

I have a simple static class with a few methods in it. Each of those methods open a SqlConnection, query the database and close the connection. This way, I am sure that I al

Answer 1

Don't ever rely on the connection to close itself. If it's not explicitly closed, it will lead to performance issues. It happened to us on our project. Yes, I'm aware that connections are managed by a connection pool, but they still have to be closed and returned to the pool.