how to validate date time picker(custom control) for from date to to date

Please have a look at the below sample hope it helps


            DateTime startdate = StartdateTimePicker.Value;
            DateTime enddate = EnddateTimePicker.Value;
            int v = startdate.CompareTo(enddate);
            switch (v)
            {
                case -1:
                    MessageBox.Show("Valid");
                    break;
                case 0:
                    MessageBox.Show("both dates are equal");
                    break;
                case 1:
                    MessageBox.Show("Invalid");
                    break;
            }