gistfile1.txt

  public static class CollectionExtention
    {
        public static string ToCsv<T>(this IEnumerable<T> source, string delimiter = ",")
        {
            return
                source
                //Go Throu all elements
                .Select(s => typeof(T)
                    .GetProperties()
                    //go throu all Propertys
                    .Select(e =>
                        //null check then use Placeholder
                        (e.GetValue(s) ?? DBNull.Value)
                        .ToString()
                            )
                    //combine to single Line
                    .Aggregate((e, f) => e + delimiter + f))
                //combine to document
                .Aggregate((e, f) => e + Environment.NewLine + f);
        }
    }