public abstract class Shape
    {

        private string _Me = string.Empty;
        public string Me
        {
            get { return _Me; }
        }
        
        public void CallMe()
        {
            Console.WriteLine("i am calling from Base");
        }
        public void ColorShapes(Shape Shape)
        {
            if (Shape is Circle)
            {
                // calling circle dal
                
            }
            else if (Shape is Triangle)
            {
            }
 
        }
    }

    public class Circle : Shape
    {
        public string CircleID { get; set; }
        public string CircleLogo { get; set; }
        public string CircleColor { get; set; }

        public void CircleMe() { }

    }
    public class Triangle : Shape
    {
        public string TriangleID { get; set; }
        public string TriangleLogo { get; set; }
        public string TriColor { get; set; }

        public void TriMe() { }

    }

 //Shape _s = new Circle();
            //((Circle)_s).CircleColor = "Red";
            //((Circle)_s).CircleID = "1";
            //((Circle)_s).CircleLogo = "Flag";
            //_s.ColorShapes(_s);
            //((Circle)_s).CircleMe();


or this one
  Circle _c = new Circle();
            _c.ColorShapes(_c);