if (ts1.CompareTo(DateTime.Now) == -1 && ts2.CompareTo(DateTime.Now) == -1)
            {
                MessageBox.Show("....");
            }

the function asks for a object, i gave an object...

Because it's not a TimeSpan. Use DateTime.Now.TimeOfDay. That is if ts1 is of type TimeSpan.

Works with me if ts1 and ts2 are DateTimes.

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