using System.Collections.Generic;
public static void Main()
List<string> list1 = new List<string>()
List<string> list2 = new List<string>()
List<string> list3 = new List<string>()
foreach (var item1 in list1)
foreach (var item2 in list2)
foreach (var item3 in list3)
temp += ($"'{item1}','{item2}','{item3}';");