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private void button1_Click(object sender, EventArgs e)
{
int M = 100;
progressBar1.Visible = true;
progressBar1.Minimum = 0;
progressBar1.Maximum = M;
progressBar1.BackColor = Color.Green;
for (int i = 0; i < M; i++)
{
progressBar1.Value++;
Application.DoEvents();
}
}