constant and some static concept

using System;

namespace accessspecifier

{

    class constant

    {

        public const int i = 44;

        public static int a = 22;

        public const string str = "anurag";

        int n = 34;

        public static void Main(string[] args)

        {

            Console.WriteLine("i={0}", i);//44

            Console.WriteLine("i={0}", constant.i);//44

            a = a + 1;

            Console.WriteLine("a={0}", a);//this will work and the output will be 23; as a is static;

            //i = 34;//Error 1 The left-hand side of an assignment must be a variable, property or indexer//you cannot change the constant value....

            //n = n + 1;//wrong first you will not get the n when you press n as above its not static

            //Console.WriteLine(n);

            Console.ReadLine();

        }

    }

}