CREATE OR ALTER TRIGGER VISIT_EVENT FOR VISITS
ACTIVE AFTER INSERT POSITION 0
AS
begin
  POST_EVENT 'new_visit';
end

class Program
    {
        static void Main(string[] args)
        {

            FbConnectionStringBuilder cs = new FbConnectionStringBuilder();
            cs.DataSource = "тут адрес сервера";
            cs.Database = "тут база";
            cs.UserID = "SYSDBA";
            cs.Password = "тут пароль";
            cs.Charset = "NONE";
            cs.Pooling = false;
            FbConnection connection = new FbConnection(cs.ToString());
            connection.Open();

            FbRemoteEvent revent = new FbRemoteEvent(connection);
            revent.AddEvents(new string[] { "new_visit","NEW_EVENT","EDIT_GATEKEY" });
            //Добавить функцию обратного вызова для Firebird событий
            revent.RemoteEventCounts += new FbRemoteEventEventHandler(EventCounts);
            revent.QueueEvents();
            Console.ReadLine();
            connection.Close();           
        }

        static void EventCounts(object sender, FbRemoteEventEventArgs args)
        {
            Console.WriteLine("Event {0} has {1} counts.", args.Name, args.Counts);
        }
    }

Console.ReadLine();