C#

Test(double b_):this(b_,c) 

lass Test 

    {

        double area;



        public Test(double b_)

        {

            // here do some operation with b, to obtain c. Now I would like to use
            // the constructor public Test(b_ , c)
            // but the syntax Test(double b_):this(b_,c) is not possible  since c is initialized
            // in the constructor
            double c = b_ * Math.Sqrt(44);
            //of course I can do: area = b * c; but I want not to rewrite some part of code in      
            //different constructor
        }



        public Test(double b_ , double l) 

        {

            area = b * l;

        }

    }

public void DrawCollisionMap(Map map)
{
    _panel.AutoScrollMinSize = new Size(map.Width*Map.TileSize, map.Height*Map.TileSize);

    _panel.Paint -= _panel_Paint;
    _panel.Paint += _panel_Paint;
    _panel.Invalidate(true);
}

void _panel_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.Clear(Color.White);
    for (int x = 0; x < _map.Width; x++)
    {
        for (int y = 0; y < _map.Height; y++)
        {
            e.Graphics.DrawRectangle(_pen, x * Map.TileSize, y * Map.TileSize, _map.Width, _map.Height);
        }
    }

}