How Do I Write Public Properties From A Class To A Textfile?

Type getPublicPropertiesType = (typeof(IOffer));
                PropertyInfo[] myPropertyInfo = getPublicPropertiesType.GetProperties(BindingFlags.Public | BindingFlags.Instance);

StreamWriter log;

               if (!File.Exists("logg.txt"))
               {
                   log = new StreamWriter("logg.txt");
               }
               else
               {
                   log = File.AppendText("logg.txt");
               }

log.WriteLine("The number of public properties is {0}.", myPropertyInfo.Length);
                log.Close();