Не меняет параметров у Points[], а также не отрисовует первую фигуру.

Первое условие выполняется на доли секунды а потом то что отрисовал пропадает. Также хочу чтобы при изменении окна параметры тоже менялись, пробовал через Resize,ResizeEnd,ClienSizeChanged но ничего не получается, прошу скинуть готовый код или файл проекта. Буду крайне признателен, заранее спасибо!
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace training10
{
public partial class Form1 : Form
{
Random rand = new Random();
int i = 0;
Graphics g;
Pen pen;
Point point1;
Point point2;
Point point3;
Point point4;
Point point5;
Point point6;
Point point7;
public Form1()
{
InitializeComponent();
g = this.CreateGraphics();
}
private void Form1_Click(object sender, EventArgs e)
{
g.Clear(SystemColors.Control);
pen = new Pen(Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
point1 = new Point(rand.Next(0, this.ClientSize.Width), rand.Next(0, this.ClientSize.Height));
point2 = new Point(rand.Next(0, this.ClientSize.Width), rand.Next(0, this.ClientSize.Height));
point3 = new Point(rand.Next(0, this.ClientSize.Width), rand.Next(0, this.ClientSize.Height));
point4 = new Point(rand.Next(0, this.ClientSize.Width), rand.Next(0, this.ClientSize.Height));
point5 = new Point(rand.Next(0, this.ClientSize.Width), rand.Next(0, this.ClientSize.Height));
point6 = new Point(rand.Next(0, this.ClientSize.Width), rand.Next(0, this.ClientSize.Height));
point7 = new Point(rand.Next(0, this.ClientSize.Width), rand.Next(0, this.ClientSize.Height));
Point[] points = { point1, point2, point3, point4, point5, point6, point7 };
pen = new Pen(Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
i++;
System.Drawing.Drawing2D.HatchBrush hatchBrush1 = new HatchBrush(HatchStyle.Sphere, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush2 = new HatchBrush(HatchStyle.Cross, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush3 = new HatchBrush(HatchStyle.Divot, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush4 = new HatchBrush(HatchStyle.DottedDiamond, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush5 = new HatchBrush(HatchStyle.HorizontalBrick, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush6 = new HatchBrush(HatchStyle.LargeGrid, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush7 = new HatchBrush(HatchStyle.LightHorizontal, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush8 = new HatchBrush(HatchStyle.LightVertical, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush9 = new HatchBrush(HatchStyle.NarrowHorizontal, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
System.Drawing.Drawing2D.HatchBrush hatchBrush10 = new HatchBrush(HatchStyle.NarrowVertical, Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)), Color.FromArgb(rand.Next(150, 255), rand.Next(150, 255), rand.Next(150, 255)));
switch (i)
{
case 1:
g.FillClosedCurve(hatchBrush1, points);
label1.Text = "Sphere";
break;
case 2:
g.FillClosedCurve(hatchBrush2, points);
label1.Text = "Cross";
break;
case 3:
g.FillClosedCurve(hatchBrush3, points);
label1.Text = "Divot";
break;
case 4:
g.FillClosedCurve(hatchBrush4, points);
label1.Text = "DottedDiamond";
break;
case 5:
g.FillClosedCurve(hatchBrush5, points);
label1.Text = "HorizontalBrick";
break;
case 6:
g.FillClosedCurve(hatchBrush6, points);
label1.Text = "LargeGrid";
break;
case 7:
g.FillClosedCurve(hatchBrush7, points);
label1.Text = "LightHorizontal";
break;
case 8:
g.FillClosedCurve(hatchBrush8, points);
label1.Text = "LightVertical";
break;
case 9:
g.FillClosedCurve(hatchBrush9, points);
label1.Text = "NarrowHorizontal";
break;
case 10:
g.FillClosedCurve(hatchBrush10, points);
label1.Text = "NarrowVertical";
i = 0;
break;
}
}
}
}