This is a simple version of the card game
HiLow that includes a high score table.
In 2003, when I started to program with C#, I was interested in writing a card game. After some time, I found enough information to write a wrapper class to use the cards.dll that ships with Windows. This prompted me to write an article about the DLL that can be found here. Since then, I have been gradually improving it to a point where I feel it is now in a good enough state to be resubmitted. If you want to see the history of how I got to where the class is now, you can see this on my website.
The game is simply based on guessing whether the next random card is higher or lower than the currently shown card. Each game costs 10 points, and if you guess four correct cards, you win 20 points. After playing for a while, guessing four correct cards is not as easy as it seems.
When you have either guessed four correct cards or you have lost the game, then the "Play Again" button appears.
The Wrapper Class
The first change to the cards.dll wrapper class is that it now implements
IDisposable. This is to make sure that the graphics device context is cleaned up properly, as the class now has its own graphics surface to draw upon.
private Graphics graphicsSurface;
private IntPtr graphicsDC;
In order to now use the class, we call
Begin before any cards are drawn, and
End when we have finished drawing our cards.
protected override void OnPaint(PaintEventArgs e)
cardDrawing.Begin( e.Graphics );
. . .
Also, we need to ensure that the cards'
Dispose method is called from the form.
if( cardDrawing != null )
One of the nice new features of the class is the ability to draw a card rotated at any angle. So in order to draw the King of Hearts rotated at 90 degrees anti-clockwise from the top-left corner of the card, we would use the following line of code:
cardDrawing.DrawRotatedCard( new Point(120,120), 90,
Card.ToCardIndex( CardSuit.Hearts, CardRank.King ) );
cardDrawing is an instance of the
A Simple Deck Class
This application uses a simple class to represent a deck of cards. Rather than having an array of cards, we only need an array of integers, because the
Card class only draws cards and nothing else.
public class Deck
private int CardArray = new int;
for( int i = 0; i < 52; i++ )
CardArray[i] = i;
This makes it easy to implement a shuffle routine, which is very random in nature.
public void Shuffle()
int newArray = new int;
bool used = new bool;
for( int j = 0; j < 52; j++ )
used[j] = false;
Random rnd = new Random();
int iCount = 0;
while( iCount < 52 )
iNum = rnd.Next( 0, 52 );
if( used[iNum] == false )
newArray[iCount] = iNum;
used[iNum] = true;
CardArray = newArray;
Finally, the current integer stored in our array is accessed to know which card to draw.
public int GetCard( int arrayNum )
if (arrayNum >= 0 && arrayNum <= 51)
throw (new System.ArgumentOutOfRangeException("arrayNum", arrayNum,
"Value must be between 0 and 51."));
Whilst making this game, I decided that I wanted a high score table. Rather than re-inventing the wheel so to speak, I have incorporated the
HighScore class from my Yahtzee game submitted previously.
Enjoy the game!
- 10th May, 2007 - Updated source code for .NET 2.0
- 14th May, 2007 - Updated article posted to Code Project
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