How to convert Generic list into CSV format?

How to convert Generic list into CSV format?

        public static string ListToCSV<T>(List<T> list)

        {

            string output = null;

            foreach (System.Reflection.PropertyInfo info in typeof(T).GetProperties())

            {

                output += ((output==null)?"": ",")+ info.Name;

            }

            output += "\r\n";

            foreach (T t in list)

            {

                string oneline = null;

                foreach (System.Reflection.PropertyInfo info in typeof(T).GetProperties())

                {

                    oneline +=  ((info.GetValue(t, null)==null)?"": info.GetValue(t, null)) +   ",";

                }

                output += oneline + "\r\n";

            }

            return output;

        }