C# Code:

using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace Cards
{
    /// <summary>
    /// Class wrapper to Cards.dll
    /// </summary>
    public sealed class Card
    {
        #region API Declares
        [DllImport("cards.dll")]
        private static extern bool cdtInit([In] ref int width, [In] ref int height);

        [DllImport("cards.dll")]
        private static extern void cdtTerm();

        [DllImport("cards.dll")]
        private static extern int cdtDrawExt(IntPtr hDC, int x, int y, int dx, int dy,
            int ecsCard, int ectDraw, int clr);

        [DllImport("cards.dll")]
        private static extern int cdtDraw(IntPtr hDC, int x, int y, int ecsCard,
            int ectDraw, int clr);

        [DllImport("cards.dll")]
        private static extern int cdtAnimate(IntPtr hDC, int ecbCardBack, int x, int y, int iState);
        #endregion

        #region fields
        private static int _standardWidth;
        private static int _standardHeight;
        #endregion

        #region Constructor
        static Card()
        {
            bool ret = Card.cdtInit(ref _standardWidth, ref _standardHeight);
            if (!ret)
                throw new ApplicationException("Can't load cards.dll !");

            // free up library when process exits
            AppDomain.CurrentDomain.ProcessExit += new EventHandler(CurrentDomain_ProcessExit);
        }
        #endregion

        #region Public Static Members
        public static void DrawFace(Graphics g, int x, int y, int width, int height, int faceValue, CardSuit suit, Color invertedColor)
        {
            if (faceValue<0 || faceValue>12)
                throw new ArgumentOutOfRangeException("FaceValue", faceValue, "faceValue must be in the range 0 - 12.");

            int cardValue = (int)suit  + faceValue * 4;
            IntPtr hDc = g.GetHdc();
            try
            {
                cdtDrawExt(hDc, x, y, width, height, cardValue, invertedColor!=Color.Empty ? 2 : 0, ConvertColor(invertedColor));
            }
            finally
            {
                g.ReleaseHdc(hDc);
            }
        }
        public static void DrawFace(Graphics g, int x, int y, int width, int height, int faceValue, CardSuit suit)
        {
            DrawFace(g, x, y, width, height, faceValue, suit, Color.Empty);
        }
        public static void DrawFace(Graphics g, int x, int y, int faceValue, CardSuit suit, Color invertedColor)
        {
            if (faceValue<0 || faceValue>12)
                throw new ArgumentOutOfRangeException("FaceValue", faceValue, "faceValue must be in the range 0 - 12.");

            int cardValue = (int)suit  + faceValue * 4;
            IntPtr hDc = g.GetHdc();
            try
            {
                cdtDraw(hDc, x, y, cardValue, invertedColor!=Color.Empty ? 2 : 0, ConvertColor(invertedColor));
            }
            finally
            {
                g.ReleaseHdc(hDc);
            }
        }
        public static void DrawFace(Graphics g, int x, int y, int faceValue, CardSuit suit)
        {
            Card.DrawFace(g, x, y, faceValue, suit, Color.Empty);
        }
        public static void DrawDeck(Graphics g, int x, int y, int width, int height, CardDeck deck)
        {
            IntPtr hDc = g.GetHdc();
            try
            {
                cdtDrawExt(hDc, x, y, width, height, (int)deck, 1, 0);
            }
            finally
            {
                g.ReleaseHdc(hDc);
            }
        }
        public static void DrawDeck(Graphics g, int x, int y, CardDeck deck)
        {
            IntPtr hDc = g.GetHdc();
            try
            {
                cdtDraw(hDc, x, y, (int)deck, 1, 0);
            }
            finally
            {
                g.ReleaseHdc(hDc);
            }
        }
        public static void DrawDeck(Graphics g, int x, int y, int width, int height, Color backgroundColor)
        {
            IntPtr hDc = g.GetHdc();
            try
            {
                cdtDrawExt(hDc, x, y, width, height, (int)CardDeck.CrossHatch, 1, Card.ConvertColor(backgroundColor));
            }
            finally
            {
                g.ReleaseHdc(hDc);
            }
        }
        public static void DrawDeck(Graphics g, int x, int y, Color backgroundColor)
        {
            IntPtr hDc = g.GetHdc();
            try
            {
                cdtDraw(hDc, x, y, (int)CardDeck.CrossHatch, 1, Card.ConvertColor(backgroundColor));
            }
            finally
            {
                g.ReleaseHdc(hDc);
            }
        }
        #endregion

        #region Properties
        /// <summary>
        /// Gets the standard width of the cards.
        /// </summary>
        public static int StandardWidth
        {
            get
            {
                return Card._standardWidth;
            }
        }
        /// <summary>
        /// Gets the standard height of the cards.
        /// </summary>
        public static int StandardHeight
        {
            get
            {
                return Card._standardHeight;
            }
        }
        #endregion

        #region private members
        private static void CurrentDomain_ProcessExit(object sender, EventArgs e)
        {
            Card.cdtTerm();
        }
        private static int ConvertColor(Color c)
        {
            if (c!=Color.Empty)
                return (Convert.ToInt32(c.B) << 16) + (Convert.ToInt32(c.G) << 8) + c.R;
            return 0;
        }
        #endregion
    }

    #region enums
    public enum CardSuit : int
    {
        Clubs = 0,
        Diamonds = 1,
        Hearts = 2,
        Spades = 3
    }
    public enum CardDeck : int
    {
        CrossHatch = 53,
        Weave1 = 54,
        Weave2 = 55,
        Robot = 56,
        Flowers = 57,
        Vine1 = 58,
        Vine2 = 59,
        Fish1 = 60,
        Fish2 = 61,
        Shells = 62,
        Castle = 63,
        Island = 64,
        CardHand = 65,
        The_X = 67,
        The_O = 68
    }
    #endregion
}

VB.NET Code:

Namespace Cards
    ''' <summary>
    ''' Wrapper class for the Cards.dll
    ''' </summary>
    Public NotInheritable Class Card

#Region "API Deceleration"

    Private Declare Function cdtInit Lib "cards.dll" (ByRef width As Integer, ByRef height As Integer) As Boolean

    Private Declare Sub cdtTerm Lib "cards.dll" ()

    Private Declare Function cdtDraw Lib "cards.dll" (ByVal hDC As IntPtr, ByVal x As Integer, ByVal y As Integer, ByVal ecsCard As Integer, ByVal ectDraw As Integer, ByVal clr As Integer) As Integer

    Private Declare Function cdtDrawExt Lib "cards.dll" (ByVal hDC As IntPtr, ByVal x As Integer, ByVal y As Integer, ByVal dx As Integer, ByVal dy As Integer, ByVal ecsCard As Integer, ByVal ectDraw As Integer, ByVal clr As Integer) As Integer

    Private Declare Function cdtAnimate Lib "cards.dll" (ByVal hDC As IntPtr, ByVal ecbCardBack As Integer, ByVal x As Integer, ByVal y As Integer, ByVal iState As Integer)

#End Region

#Region "Fields"

    Private Shared _standardWidth As Integer

    Private Shared _standardHeight As Integer

#End Region

#Region "Constructor"

    Shared Sub New()
        Dim ret As Boolean = Card.cdtInit(_standardWidth, _standardHeight)

        If (Not ret) Then
        Throw New ApplicationException("Can't load 'cards.dll'!")
        End If

        ' Free up library when process exits
        AddHandler AppDomain.CurrentDomain.ProcessExit, AddressOf CurrentDomain_ProcessExit
    End Sub

#End Region

#Region "Public Shared Members"

    Public Shared Sub DrawFace(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal width As Integer, ByVal height As Integer, ByVal faceValue As Integer, ByVal suit As CardSuit, ByVal invertedColor As Color)
        If (faceValue < 0 OrElse faceValue > 12) Then
        Throw New ArgumentOutOfRangeException("FaceValue", faceValue, "faceValue must be in the range 0 - 12.")
        End If

        Dim cardValue As Integer = DirectCast(suit, Integer) + faceValue * 4
        Dim hDC As IntPtr = g.GetHdc()

        Try
        cdtDrawExt(hDC, x, y, width, height, cardValue, IIf(invertedColor <> Color.Empty, 2, 0), ConvertColor(invertedColor))
        Finally
        g.ReleaseHdc(hDC)
        End Try
    End Sub

    Public Shared Sub DrawFace(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal width As Integer, ByVal height As Integer, ByVal faceValue As Integer, ByVal suit As CardSuit)
        DrawFace(g, x, y, width, height, faceValue, suit, Color.Empty)
    End Sub

    Public Shared Sub DrawFace(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal faceValue As Integer, ByVal suit As CardSuit, ByVal invertedColor As Color)
        If faceValue < 0 OrElse faceValue > 12 Then
        Throw New ArgumentOutOfRangeException("FaceValue", faceValue, "faceValue must be in the range 0 - 12.")

        Dim cardValue As Integer = DirectCast(suit, Integer) + faceValue * 4
        Dim hDc As IntPtr = g.GetHdc()

        Try
            cdtDraw(hDc, x, y, cardValue, IIf(invertedColor <> Color.Empty, 2, 0), ConvertColor(invertedColor))
        Finally
            g.ReleaseHdc(hDc)
        End Try
        End If
    End Sub

    Public Shared Sub DrawFace(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal faceValue As Integer, ByVal suit As CardSuit)
        Card.DrawFace(g, x, y, faceValue, suit, Color.Empty)
    End Sub

    Public Shared Sub DrawDeck(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal width As Integer, ByVal height As Integer, ByVal deck As CardDeck)
        Dim hDc As IntPtr = g.GetHdc()

        Try
        cdtDrawExt(hDc, x, y, width, height, DirectCast(deck, Integer), 1, 0)
        Finally
        g.ReleaseHdc(hDc)
        End Try
    End Sub

    Public Shared Sub DrawDeck(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal deck As CardDeck)
        Dim hDc As IntPtr = g.GetHdc()

        Try
        cdtDraw(hDc, x, y, DirectCast(deck, Integer), 1, 0)
        Finally
        g.ReleaseHdc(hDc)
        End Try
    End Sub

    Public Shared Sub DrawDeck(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal width As Integer, ByVal height As Integer, ByVal backgroundColor As Color)
        Dim hDc As IntPtr = g.GetHdc()

        Try
        cdtDrawExt(hDc, x, y, width, height, DirectCast(CardDeck.CrossHatch, Integer), 1, Card.ConvertColor(backgroundColor))
        Finally
        g.ReleaseHdc(hDc)
        End Try
    End Sub

    Public Shared Sub DrawDeck(ByVal g As Graphics, ByVal x As Integer, ByVal y As Integer, ByVal backgroundColor As Color)
        Dim hDc As IntPtr = g.GetHdc()

        Try
        cdtDraw(hDc, x, y, DirectCast(CardDeck.CrossHatch, Integer), 1, Card.ConvertColor(backgroundColor))
        Finally
        g.ReleaseHdc(hDc)
        End Try
    End Sub

#End Region

#Region "Properties"

    Public Shared ReadOnly Property StandardWith() As Integer
        Get
        Return Card._standardWidth
        End Get
    End Property

    Public Shared ReadOnly Property StandardHeight() As Integer
        Get
        Return Card._standardHeight
        End Get
    End Property

#End Region

#Region "private members"

    Private Shared Sub CurrentDomain_ProcessExit(ByVal sender As Object, ByVal e As EventArgs)
        Card.cdtTerm()
    End Sub

    Private Shared Function ConvertColor(ByVal c As Color) As Integer
        If c <> Color.Empty Then
        Return (Convert.ToInt32(c.B) << 16) + (Convert.ToInt32(c.G) << 8) + c.R
        End If
        Return 0
    End Function

#End Region

#Region "enums"

    Public Enum CardSuit As Integer
        Clubs = 0
        Diamonds = 1
        Hearts = 2
        Spades = 3
    End Enum

    Public Enum CardDeck As Integer
        CrossHatch = 53
        Weave1 = 54
        Weave2 = 55
        Robot = 56
        Flowers = 57
        Vine1 = 58
        Vine2 = 59
        Fish1 = 60
        Fish2 = 61
        Shells = 62
        Castle = 63
        Island = 64
        CardHand = 65
        The_X = 67
        The_O = 68
    End Enum

#End Region

    End Class
End Namespace