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How to use Gdk# library in C# (mono)?
GDKEXAMPLE(){
    win = new Gtk.Window ("Gdk nightmare");
    win.SetDefaultSize (400, 300);
    img=new Gtk.Image();
    Drawable dr=new Drawable(null); //how to instantiate this object?
    Gdk.GC gc=new Gdk.GC(null); //how to instantiate this object?
    Point[] pts=new Point[3];
    pts[0]=new Point(10,10);
    pts[1]=new Point(15,20);
    pts[2]=new Point(20,50);

    dr.DrawLines(gc,pts);
    Pixmap pxmp=new Pixmap(dr,100,100);
    img.SetFromPixmap(pxmp,pxmp); //Requests a pixmap and pixmap mask: what mask?
    img.QueueDraw();

    win.Add(img);
    win.ShowAll();
}

class GdkApp : Gtk.Window {
Pixmap pxp;
public static void Main()
{
    Application.Init();
    new GdkApp();
    Application.Run();
}

public GdkApp() : base("Simple drawing")
{
    SetDefaultSize(230, 150);
    DeleteEvent+=delegate {Application.Quit(); };
    base.KeyPressEvent+= OnKeyPress;
    ShowAll();
}
void OnKeyPress(object sender, KeyPressEventArgs KPargs)
{
    Gdk.GC gc=new Gdk.GC((Drawable)base.GdkWindow);
    gc.RgbFgColor=new Gdk.Color(255,50,50);
    gc.RgbBgColor=new Gdk.Color(0,0,0);
    gc.SetLineAttributes(3,LineStyle.OnOffDash,CapStyle.Projecting,JoinStyle.Round);

    Gdk.Point[] pts=new Gdk.Point[8];
    pts[0]=new Gdk.Point(10,50);
    pts[1]=new Gdk.Point(15,70);
    pts[2]=new Gdk.Point(20,80);
    pts[3]=new Gdk.Point(25,70);
    pts[4]=new Gdk.Point(30,80);
    pts[5]=new Gdk.Point(40,90);
    pts[6]=new Gdk.Point(55,85);
    pts[7]=new Gdk.Point(75,65);

    base.GdkWindow.DrawLines(gc,pts);
}
}