c# form size change problem

[olekba]

Hi All !

I wrote a easy program: one standard form. Next I define a paint method for this form:

 bool cl = true;
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Brush c;
            if (cl)
                 c = new SolidBrush(Color.Gray);
            else
                 c = new SolidBrush(Color.Green);

            cl = !cl;

            e.Graphics.FillRectangle(c, new Rectangle(0,0,Width,Height));
            
        }

So by every screen redraw shoud be one time gray, one time green background. But, when I i.e. change a form size, I see that not full form is redraw everytime, that I have a "zebra" effect (look attachment)


How to force, that always all will be redraw ?

THNX in advance
Olek

p.s.
I know, that I can a set a background property for have always same color. THis is not a problem. Problem is with paint somthink else, not only a background. I know also that I can put a Refresh at Resize, but this is also no solution for me - important is for my program not to redraw double.