Answer / lince thomas

bool stopBtnClk = false;
bool startBtnClk = false;
private void BtnStart_Click(object sender, EventArgs e)
{
stopBtnClk = false;

startBtnClk = true;
int i = 1;
while (true)
{
textBox1.Text = i.ToString();
i += 1;
Application.DoEvents();
if (stopBtnClk == true)
{
break;
}
}
}

private void BtnStop_Click(object sender, EventArgs e)
{
stopBtnClk = true;
Application.Exit ();
}

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