Get range of days in a week given a certain day

Question

Suppose my input is March 31, 2015.
How would I be able to get the days of the week that March 31, 2015 is in?
In this case, it should output:
March 29, 2015-April 4, 2015

I found something similar here but it's not quite what I'm looking for as that one takes in the week number while my input is a date itself.

Answer 1

DateTime date = new DateTime(2015, 3, 31);
DateTime weekFirstDay = date.AddDays(DayOfWeek.Sunday - date.DayOfWeek);
DateTime weekLastDay = weekFirstDay.AddDays(6);