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private void button10_Click(object sender, EventArgs e)
{
Graphics g = this.panel1.CreateGraphics();
Pen pen = new Pen(Color.White, 5);
for (int i = 0; i < 10; i++)
{
if (i % 2 == 0)
{
pen.Color = Color.White;
g.DrawLine(pen, new Point(5 * i, 0), new Point(5 * i, panel1.Height));
}
else
{
pen.Color = Color.Black;
g.DrawLine(pen, new Point(5 * i, 0), new Point(5 * i, panel1.Height));
}
}
}