C# 属性与字段;

    class B
    {
        private string _name;
        public string Name
        {
            get
            {
                return _name;
            }
            set
            {
                _name = value;
            }
        }
         public void say()
        {
            Console.WriteLine(this._name);
        }
    }

        public int Age {get;set;}=10;