How to get week span with weekNumber and Year

Hi!!

know someone how to get a week span with week number and year?

something like hi:

public static DateTime[] GetWeekSpan(int weekNumber, int year)
{
DateTime weekStartDate = new DateTime();
DateTime weekEndDate = new DateTime();

//do something to find the sweek span!!!!

DateTime[] currentWeekSpan = new DateTime[2];

currentWeekSpan[0] = weekStartDate;
currentWeekSpan[1] = weekEndDate;

return currentWeekSpan;
}

any ideas???
regards,

gicio