Timmer

public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
timer1.Start();
if (progressBar1.Value < 100)
{
progressBar1.Value += 1;
}
else
{
progressBar1.Value = 0;
}
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Stop();
}
private void button3_Click(object sender, EventArgs e)
{
timer1.Stop();
progressBar1.Value = 0;
}