How to get the date of the next Sunday? [duplicate]

Answer 1

/// 

/// Finds the next date whose day of the week equals the specified day of the week.
/// 
/// 
/// The date to begin the search.
/// 
/// 
/// The desired day of the week whose date will be returneed.
/// 
/// 
/// The returned date is on the given day of this week.
/// If the given day is before given date, the date for the
/// following week's desired day is returned.
/// 
public static DateTime GetNextDateForDay( DateTime startDate, DayOfWeek desiredDay )
{
    // (There has to be a better way to do this, perhaps mathematically.)
    // Traverse this week
    DateTime nextDate = startDate;
    while( nextDate.DayOfWeek != desiredDay )
        nextDate = nextDate.AddDays( 1D );

    return nextDate;
}

Source:

http://angstrey.com/index.php/2009/04/25/finding-the-next-date-for-day-of-week/