access modifier

private set

 public class Student
    {
        public int MyProperty { get; set; }

        public int MyProperty1 { get; private set; }

        public int MyProperty2 { get;  }

        public Student()
        {
            this.MyProperty = 1;
            this.MyProperty1 = 2;
            this.MyProperty2 = 3;
        }

        public void TestValue()
        {
            this.MyProperty = 4;

            //只能在类内部设置
            this.MyProperty1 = 5;

            //语法错误，该属性没有set语句，不能在构造函数外设置值
            this.MyProperty2 = 6;
        }
    }