GDI+ flicker isseue

[phyxsiuspgl]

i'm still a newbie and i really don't get it. i've read like 20-30 other threads on the forum but i can't make it work. This is the deal: a simple 2d drawing application, all the drawings are in a panel. i're read that something about Style must be set in the constructor.. wich contructor? Panel's? or Form? how to i override onPaintBackground? do i have to do another class that inherites Panel? in the new class constructor i must set Control Style? where should i put an instance of this new class? my old panel should be replaced by the instance of this new class?

        private void pnlDraw_MouseMove(object sender, MouseEventArgs e)
        {
            this.lblMouseMove.Text = "( " + e.X.ToString() + ", " + e.Y.ToString() + " )";
            Graphics g = pnlDraw.CreateGraphics();
 
 
 
            if (activePencil && mouseDown)
            {
                g.DrawLine(new Pen(System.Drawing.Color.Black, 3),start.X, start.Y, e.X, e.Y);
                start.X = e.X;
                start.Y = e.Y;
            }
 
 
            //temp figure 
 
            tempGP = new GraphicsPath();
           if (mouseDown)
            if (activeSquare)
                tempGP.AddRectangle(new Rectangle(start.X, start.Y, e.X - start.X, e.Y - start.Y));
            else
                if (activeCircle)
                    tempGP.AddEllipse(new Rectangle(start.X, start.Y, e.X - start.X, e.Y - start.Y));
                else
                    if (activeLine)
                        tempGP.AddLine(start.X,start.Y,e.X,e.Y);
 
 
 
 
            g.DrawPath(Pens.Black, tempGP);
            this.Refresh();
 
            if (gp != null) 
                if (gp.IsVisible(e.X, e.Y)) g.FillPath(Brushes.BlueViolet, gp);
                else g.FillPath(Brushes.White, gp);
            this.Invalidate();
 
            //translate
           // activeTranslate = false;
 
            if (mouseDown && activeTranslate)
            {
                this.Cursor = Cursors.SizeAll;
                foreach (GraphicsPath gpi in allGraphicsPath)
                    if (gpi.IsVisible(e.X, e.Y))
                    {
                        gp = gpi;
                        break;
                    }
                GraphicsPath gpPrevious = gp;
 
 
                Matrix translate = new Matrix(1, 0, 0, 1, 0, 0);
                translate.Translate(e.X - start.X, e.Y - start.Y);
                if (gp != null)
                    if (gp.IsVisible(e.X, e.Y) && mouseDown && activeTranslate)
                    {
                        start.X = e.X;
                        start.Y = e.Y;
                        gp.Transform(translate);
                        allGraphicsPath.Remove(gpPrevious);
                        allGraphicsPath.Add(gp);
                        this.pnlDraw.Refresh();
                        gpPrevious = gp;
                    }
            }
 
            foreach (GraphicsPath gpi in allGraphicsPath)
                if (gpi != null)
                {
                    if (activeTranslate)
                        if (allGraphicsPath.Contains(gp))
                        {
                        }
                    if (gpi.IsVisible(e.X, e.Y))
                        g.FillPath(Brushes.BlueViolet, gpi);
                    else
                        g.FillPath(Brushes.White, gpi);
                }
            this.Invalidate();
 
        }
 
 
 

Wich Invalidate/Refresh should be deleted?

i hope you find you're answers for my questions


Thank you,
George