Changing default value for inherited members

gistfile1.cs

   public class Class1 
    {
        internal static int Myvar;
        private int _myVar;
        public int MyVar1
        {
            get{return this.GetType().IsSubclassOf(typeof(Class1)) ? Myvar : _myVar;}
            set{_myVar = value;Myvar = value;}
        }
    }
    public class Class2 : Class1
    {
        public int MyVar2 { get; set; }
    }

gistfile2.cs

var myC1 = new Class1 { MyVar1 = 10 };
var myC2 = new Class2 { MyVar2 = 15 }; //myC2.MyVar1 = 10
var myC3 = new Class1 { MyVar1 = 11 }; //myC2.MyVar1 = 11; myC1.MyVar1 = 10