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bool noline = false;
private void button1_Click(object sender, EventArgs e)
{
noline = !noline;
pictureBox1.Refresh();
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
if (noline) return;
Graphics g = e.Graphics;
Pen pen = new Pen(Color.Green);
g.DrawLine(pen, 0, 0, 100, 100);
}