随机选择2个整数作为选项

private void btnStart_Click(object sender, EventArgs e)
{
    Random random = new Random();
    int randomNumber = random.Next(0, 1000);
    int RandomTolerance = 5 || 10;
    lblRandomValue.Text = randomNumber + \"000\" + \"O\" + RandomTolerance;
}

int RandomTolerance=random.Next(0,2)<1?5:10;

int RandomTolerance = random.Next(1,3) * 5;