Example of Singleton pattern

    public class sing

    {

        private static sing Sing;

        private sing()

        {

        }

        public int x;

        public int y;

        public static sing SING

        {

            get

            {

                if (Sing == null)

                {

                    Sing = new sing();

                }

                return Sing;

            }

        }

    }

static void Main(string[] args)

        {

            sing.SING.x = 7;

            Console.WriteLine(sing.SING.x.ToString());