DraggableArea.cs

public class DraggableArea
    {
        public DraggableArea(double x,
                            double y,
                            double width,
                            double height)
        {
            X = x;
            Y = y;
            Width = width;
            Height = height;
        }

        public double X { get; }
        public double Y { get; }
        public double Width { get; }
        public double Height { get; }
    }