SU MO TU WE TH FR SA          01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

    class Interview1     {         static void Main()         {             PrintCalender(2011, 10);         }         public static void PrintCalender(int year, int month)         {             formatDate fd = new formatDate(year, month);             string calender =            @"SU MO TU WE TH FR Sa             {0} {0} {0} {0} {0} {0} {0} {0}             {0} {0} {0} {0} {0} {0} {0} {0}             {0} {0} {0} {0} {0} {0} {0} {0}             {0} {0} {0} {0} {0} {0} {0} {0}             {0} {0} {0} {0} {0} {0} {0} {0}";             calender = string.Format(calender, fd).TrimEnd();             Console.WriteLine(calender);         }     }     class formatDate : IFormattable     {         int num;         int max;         public formatDate(int year, int month)         {             DateTime dt = new DateTime(year, month, 1);             num = (int)dt.DayOfWeek * -1;             max = DateTime.DaysInMonth(year, month);         }         public string ToString(string format,IFormatProvider formatProvider)         {             return num++ < 0 || num > max ? "  " : num.ToString("00");         }     }