using System;

public class Program

{

    static int year = new int();

    static int month = new int();

    static int[,] calendar = new int[6, 7];

​

   public static void Main(string[] args)

    {

        Console.Write("Enter the year? ");

        year = Convert.ToInt32(Console.ReadLine());

 Console.Write("Enter the month (January = 1, etc): ");

        month = Convert.ToInt32(Console.ReadLine());

​

        DrawHeader();

        FillCalendar();

        DrawCalendar();

        Console.ReadLine();

    }

​

   public static void DrawHeader()

    {

        Console.Write("\n\n");

        Console.WriteLine("\t" + month);

        Console.WriteLine("Mo Tu We Th Fr Sa Su");

    }

​

   public static void FillCalendar()

    {

        int days = DateTime.DaysInMonth(year, month);

        int currentDay = 1;

        for (int i = 0; i < calendar.GetLength(0); i++)

        {

            for (int j = 0; j < calendar.GetLength(1) && currentDay <= days; j++)

            {

                if (i == 0 && month > j)

                {

                    calendar[i, j] = 0;

                }

                else

                {

                    calendar[i, j] = currentDay;

                    currentDay++;

                }

            }

        }

    }

​

   public static void DrawCalendar()

    {

        for (int i = 0; i < calendar.GetLength(0); i++)

        {

            for (int j = 0; j < calendar.GetLength(1); j++)

            {

                if (calendar[i, j] > 0)

                {

                    if (calendar[i, j] < 10)

                    {

                        Console.Write(" " + calendar[i, j] + " ");

                    }

                    else

                    {

                        Console.Write(calendar[i, j] + " ");

                    }

                }

                else

                {

                    Console.Write("");

                }

            }

            Console.WriteLine("");

        }

    }

}

​