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int year = 2009;
for (DateTime dt = new DateTime(year, 1, 1); dt < new DateTime(year, 12, 31); dt = dt.AddDays(1))
if (dt.DayOfWeek == DayOfWeek.Saturday || dt.DayOfWeek == DayOfWeek.Sunday)
Console.WriteLine(dt.ToString("yyyy-MM-dd") + " " + dt.DayOfWeek);