StaticClassHoldingState

namespace StaticTest {
    using System;
    
    class MainClass {
        static void Main() {
            Test.ListOfStrings.Add("1");
            Test.ListOfStrings.Add("2");
            
            new Handler().Handle();
            
            foreach (var item in Test.ListOfStrings) {
                Console.WriteLine(item);
            }
        }
    }
}