System.Data.SqlClient.SqlExceptionExtensions.IsTcpIpConnectionError C# (CSharp) Méthode

        private static bool IsTcpIpConnectionError(SqlException exception)
        {
            return exception.Class == 20 && (
                                                exception.Number == 64 ||       // A connection was successfully established with the server, but then an error occurred during the login process. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)
                                                exception.Number == 10053 ||    // ConnectionAborted - A connection was successfully established with the server, but then an error occurred during the login process. (provider: TCP Provider, error: 0 - An established connection was aborted by the software in your host machine.)
                                                exception.Number == 10054 ||    // ConnectionReset
                                                exception.Number == 10061 ||    // ConnectionRefused
                                                false);
        }