c# Concat كافة السلاسل داخل قائمة <string> باستخدام LINQ

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using System.Linq;

public class Person
{
  string FirstName { get; set; }
  string LastName { get; set; }
}

List<Person> persons = new List<Person>();

string listOfPersons = string.Join(",", persons.Select(p => p.FirstName));

c#1

420

2018-12-11T00:00Z

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List<string> strings = new List<string>() { "ABC", "DEF", "GHI" };
string s = strings.Aggregate((a, b) => a + ',' + b);

c#2

419

2018-12-18T00:00Z