StaticConstrucor

 class A
    {
        protected  static int a, b;
        protected int c;
        static A()

        {
            a = 10;
            Console.WriteLine("static A");
           
         }

       public A()
        {
            a = 5;
            Console.WriteLine("A Constructor");
            c = 0;
        }
    }

    class B:A
    {
        static B()
        {
            b = 20;
            a = 30;
            Console.WriteLine("Staic B");
            b = 20;
            a = 30;
        }
        public B(int a)
        {
            Console.WriteLine("B Constructor");
            c = 4;
            a = 7;
        }
           
    }
    class C:B
    {
        static C()
        {
            a = 10;
            Console.WriteLine("Static C");
        }

        public C():base(10)
        {
            Console.WriteLine("C Constructor");
            c = 0;
            a = 70;
        }
    }





    class Program
    {
        static void Main(string[] args)
        {
            C c = new C();
            Console.ReadKey();
        }
    }