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public class Connection { public object Execute(string query) { return null; } public void Commit() { } public void Close() { } } public class Transaction { private Connection conn; public Transaction(Connection conn) { this.conn = conn; } public object Execute(string query) { return conn.Execute(query); } public void Commit() { conn.Commit(); } public void Rollback() { } } public static class DatabaseHelper { public static Connection GetConnection() { return new Connection(); } }