在C#中使用逗号连接两个List<string>中的元素

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        List<string> list1 = new List<string> { "apple", "banana", "orange" };
        List<string> list2 = new List<string> { "cat", "dog", "bird" };

        string result = string.Join(",", list1) + "," + string.Join(",", list2);
        Console.WriteLine(result);
    }
}

apple,banana,orange,cat,dog,bird