C#

public enum Suit
    {
    Spades = 0,
    Diamonds = 1,
    Clubs = 2,
    Hearts = 3,
    }
public class Card
    {
    private int _Value;
    public Suit Suit { get { return (Suit)(_Value / 13); } }
    public int Value { get { return _Value % 13; } }
    public Card(int value)
        {
        if (value < 0 || value >= 52)
            {
            throw new ArgumentException("Invalid Card : " + value);
            }
        _Value = value;
        }
    }

private List<Card> deck = new List<Card>();
private Random rand = new Random();
private Card GetNextCard(List<Card> deck)
    {
    if (deck.Count <= 0)
        {
        Enumerable.Range(0, 52).Select(c => new Card(c)).ToList();
        deck = Shuffle(deck);
        }
    Card card = deck[0];
    deck.RemoveAt(0);
    //deck.Add(card); //Uncomment this line to return cards to the bottom of the deck.
    return card;
    }
private List<Card> Shuffle(List<Card> deck)
    {
    List<Card> shuffled = new List<Card>();
    int cards = deck.Count;
    for (int i = 0; i < cards; i++)
        {
        int index = rand.Next(deck.Count);
        shuffled.Add(deck[index]);
        deck.RemoveAt(index);
        }
    return shuffled;
    }

Card c1 = GetNextCard(deck);
Card c2 = GetNextCard(deck);
Card c3 = GetNextCard(deck);
Card c4 = GetNextCard(deck);

using System;

namespace Draw4
{
    class Program
    {
        static int[] ranData = new int[4];
        static Random ran = new Random();
        static int[] KS = new int[4];

        static int GenerateRandomNum()
        {
            int cleanRanNum;
            cleanRanNum = ran.Next(1, 53);
            
            // Prevent cards from repeating

            return cleanRanNum;
        }
        static void Main(string[] args)
        {
            int idx, ranNum;
            int[] cdv = new int[4]; // 1-13
            int[] cds = new int[4]; // 1-4
            for (idx = 0; idx < 4; idx++) KS[idx] = 0;
            // loop 10,000 times
            //for (int lp = 0; lp < 10000; lp++)
            {
                // Draw 4 cards

                Console.Write("Random numbers: \t");
                for (idx = 0; idx < cdv.Length; idx++)
                {
                    ranNum = GenerateRandomNum();

                    Console.Write(ranNum + ",\t");
                    cdv[idx] = ranNum % 13;
                    if (cdv[idx] == 0)
                    {
                        cds[idx] = ranNum / 13;
                        cdv[idx] = 13;
                    }
                    else
                        cds[idx] = ranNum / 13 + 1;

                }
                Array.Sort(cdv);
                Console.Write("\nThe suits:\t\t");
                PrintingSuits(cds);
                Console.Write("\nThe values:\t\t");

                foreach (int val in cdv) Console.Write(val + ",\t");
                CountSuits(cds);
            }
            Console.Read();
        }
        static void CountSuits(int[] cds)
        {
            Array.Sort(cds);
            int howManySuits = 0;
            for (int j = 0; j < 3; j++)
                if (cds[j] != cds[j + 1]) howManySuits++;
            Console.WriteLine("\nThis hand has {0} suits", howManySuits + 1);
            return;

        }
        static void PrintingSuits(int[] suit)
        {
            string s = " ";
            foreach (int su in suit)
            {

                switch (su)
                {
                    case 1: s = "H"; break;
                    case 2: s = "S"; break;
                    case 3: s = "D"; break;
                    case 4: s = "C"; break;
                }

                Console.Write(s + ",\t");
            }
        }
    }
}

for (idx = 0; idx < cdv.Length; idx++)
{
    cdv[idx] = GetNext(deck);
    Console.WriteLine(cdv[idx]);
}

bool [] deck = new bool [52];

Mohan Subramani wrote:

1. When i use windows application in C#, on linking the SQL database am hardcoding the SQL server details (e.g: i harcode Machine1\SQLEXPRESS ) but if at all am changing the server in future to Machine2\SQLEXPRESS do i need to recompile my Code again ?