System.Xml.DocumentXmlWriter.VerifyState C# (CSharp) Method

        void VerifyState(Method method) {
            state = changeState[(int)method * (int)State.Last + (int)state]; 
            if (state == State.Error) {
                throw new InvalidOperationException(Res.GetString(Res.Xml_ClosedOrError));
            }
        }
    }