static void Main()
{
Simple ds = new Simple();
ds.DoRun();
Console.Read();
}
public void demo4()
{
CancellationTokenSource cts = new CancellationTokenSource();
CancellationToken ct = cts.Token;
Simple s = new Simple();
s.DoRun(ct);
Thread.Sleep(500);
cts.Cancel();
Console.WriteLine("end");
Thread.Sleep(2000);
}