Some C# funny static ctor

using System;
using System.Globalization;

namespace CSharpTest
{
    class Account
    {
        public static int staticValue;
        public int instanceValue;

        static Account() => staticValue = 10; // is called once then there is any usage of static value or creating first class instance
        public Account(int value) => instanceValue = value;

        public static int StaticVaule { get; set; }
        public int InstanceValue { get; set; }
    }

    class Program
    {
        static void Main(string[] args)
        {
            CultureInfo.CurrentCulture = new CultureInfo("en-US", false);

            Console.WriteLine(Account.staticValue); // 10
            Account.staticValue = 14;
            Console.WriteLine(Account.staticValue); // 14

            Account acc = new Account(100);
            Console.WriteLine(Account.staticValue); // 14

            Console.ReadKey();
        }
    }
}