Set ResizeRedraw property

   
 


using System;
using System.Drawing;
using System.Windows.Forms;
   
class RandomClearResizeRedraw: Form
{
     public static void Main()      
     {
          Application.Run(new RandomClearResizeRedraw());
     }
     public RandomClearResizeRedraw()      
     {
          ResizeRedraw = true;
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics graphics = pea.Graphics;
          Random   rand = new Random();
   
          graphics.Clear(Color.FromArgb(rand.Next(256),
                                    rand.Next(256),
                                    rand.Next(256)));
     }
}