DayOfWeek get the next DayOfWeek(Monday,Tuesday...Sunday)

Question

Is there a way to summarize this code into 1-2 lines?

My goal is to return, for example, I have a DayOfWeek which is Monday, I want to get the day after that (Tuesday) or n days after that.

         switch (_RESETDAY)
        {
            case DayOfWeek.Monday:
                _STARTDAY = DayOfWeek.Tuesday;
                break;
            case DayOfWeek.Tuesday:
                _STARTDAY = DayOfWeek.Wednesday;
                break;
            case DayOfWeek.Wednesday:
                _STARTDAY = DayOfWeek.Thursday;
                break;
            case DayOfWeek.Thursday:
                _STARTDAY = DayOfWeek.Friday;
                break;
            case DayOfWeek.Friday:
                _STARTDAY = DayOfWeek.Saturday;
                break;
            case DayOfWeek.Saturday:
                _STARTDAY = DayOfWeek.Sunday;
                break;
            case DayOfWeek.Sunday:
                _STARTDAY = DayOfWeek.Monday;
                break;
            default:
                _STARTDAY = DayOfWeek.Tuesday;
                break;
        }

Answer 1

This is just an int enumeration, ranging from Sunday (0) to Saturday (6), as per MSDN:

The DayOfWeek enumeration represents the day of the week in calendars that have seven days per week. The value of the constants in this enumeration ranges from DayOfWeek.Sunday to DayOfWeek.Saturday. If cast to an integer, its value ranges from zero (which indicates DayOfWeek.Sunday) to six (which indicates DayOfWeek.Saturday).

So simple math should do it:

DayOfWeek nextDay = (DayOfWeek)(((int)_RESETDAY + 1) % 7);

Replace + 1 with + n if that's what you need.

Answer 2

Yes.

(DayOfWeek)((int)(_RESETDAY+1)%7)