How to get day Names within specific Month

public DateTime[] GetAllDays(int year, int month)
{
    int days = DateTime.DaysInMonth(year, month);

    DateTime[] dates = new DateTime[days];

    for (int d = 0; d < days; d++)
    {
        dates[d] = new DateTime(year, month, (d + 1));
    }

    return dates;
}

DateTime[] dates = GetAllDays(2009, 3);

for(int d = 0; d < dates.Length; d++)
{
  textBox1.Text += dates[d].ToLongDateString() + Environment.NewLine;
}

Sunday, March 01, 2009
Monday, March 02, 2009
Tuesday, March 03, 2009
...
...
...
Tuesday, March 31, 2009