LottoPicks Source Code

LottoPicks Example, source code file Urn.cs

using System;
using System.Collections;

namespace LottoPicks
{
    /// <summary>
    /// LottoPicks Example, source code file Urn.cs
    /// LottoPicks Example, Urn.cs source code
    /// Simulate drawing balls from an urn (jar) without replacement.
    /// Use an ArrayList collection to keep track of the balls.
    /// </summary>

public class Urn
    {
        // Private instance variables.
        private ArrayList balls;
        private int _totalBalls;
        private Random r = new Random();

// Parameterized constructor.
        public Urn(int initialNumBalls)
        {
            // _totalBalls must be nonnegative.
            if (initialNumBalls > 0)
            {
                _totalBalls = initialNumBalls;
            }
            else
            {
                _totalBalls = 0;
            }

// Initialize collection of balls.
            balls = new ArrayList();
            for (int i = 1; i <= _totalBalls; i++)
            {
                balls.Add(i);
            }
        }

// Public read-only method.
        public int TotalBalls
        {
            get { return _totalBalls; }
        }

// Public methods:

// Return number of balls remaining.
        public int BallsRemaining()
        {
            return balls.Count;
        }

// Return true count of balls is zero.
        public bool IsEmpty
        {
            get { return balls.Count == 0; }
        }

// Draw a ball from urn.
        public int Draw()
        {
            int n = r.Next(0, balls.Count);
            int ball = (int)balls[n];
            balls.RemoveAt(n);
            return ball;
        }

// Print remaining balls in urn.
        public override string ToString()
        {
            string s = "";
            foreach (int i in balls)
            {
                s += i.ToString() + " ";
            }
            return s;
        }
    }
}

LottoPicks Example, source code file Form1.cs

using System;
using System.Windows.Forms;

namespace LottoPicks
{

/// <summary>
    /// LottoPicks Example, Form1.cs source code
    /// Use an Urn to select and display lotto picks.
    /// </summary>

public partial class Form1 : Form
    {
        // Declare instance variables.
        private TextBox[] balls = new TextBox[7];
        private Urn urn;

public Form1()
        {
            InitializeComponent();
        }

private void Form1_Load(object sender, EventArgs e)
        {
            // Create array of textboxes for displaying
            // Lotto picks.
            balls[1] = txtBall1;
            balls[2] = txtBall2;
            balls[3] = txtBall3;
            balls[4] = txtBall4;
            balls[5] = txtBall5;
            balls[6] = txtBall6;
        }

private void btnSelect_Click(object sender, EventArgs e)
        {
            // Get new Urn each time select button is clicked.
            urn = new Urn(40);

// Use temp array to sort the picks before display.
            int[] temp = new int[6];
            for(int i = 0; i <= 5; i++)
            {
                temp[i] = urn.Draw();
            }

// Sort picks
            Array.Sort(temp);

// Display picks in textboxes.
            for (int i = 0; i <= 5; i++)
            {
                balls[i+1].Text = temp[i].ToString();
            }
        }
    }
}

LottoPicks Example, source code file Form1.Designer.cs

namespace LottoPicks
{
    partial class Form1
    {
        /// <summary>
        /// LottoPicks Example, Form1.Designer.cs source code
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

/// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources 
        /// should be disposed; otherwise, false.
        /// </param>
        /// 
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

#region Windows Form Designer generated code

/// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.txtBall1 = new System.Windows.Forms.TextBox();
            this.txtBall2 = new System.Windows.Forms.TextBox();
            this.txtBall3 = new System.Windows.Forms.TextBox();
            this.txtBall4 = new System.Windows.Forms.TextBox();
            this.txtBall5 = new System.Windows.Forms.TextBox();
            this.txtBall6 = new System.Windows.Forms.TextBox();
            this.btnSelect = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // txtBall1
            // 
            this.txtBall1.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.txtBall1.Location = new System.Drawing.Point(12, 12);
            this.txtBall1.Name = "txtBall1";
            this.txtBall1.Size = new System.Drawing.Size(44, 44);
            this.txtBall1.TabIndex = 0;
            this.txtBall1.TextAlign = 
                System.Windows.Forms.HorizontalAlignment.Center;
            // 
            // txtBall2
            // 
            this.txtBall2.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.txtBall2.Location = new System.Drawing.Point(62, 12);
            this.txtBall2.Name = "txtBall2";
            this.txtBall2.Size = new System.Drawing.Size(44, 44);
            this.txtBall2.TabIndex = 1;
            this.txtBall2.TextAlign = 
                System.Windows.Forms.HorizontalAlignment.Center;
            // 
            // txtBall3
            // 
            this.txtBall3.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.txtBall3.Location = new System.Drawing.Point(112, 12);
            this.txtBall3.Name = "txtBall3";
            this.txtBall3.Size = new System.Drawing.Size(44, 44);
            this.txtBall3.TabIndex = 2;
            this.txtBall3.TextAlign = 
                System.Windows.Forms.HorizontalAlignment.Center;
            // 
            // txtBall4
            // 
            this.txtBall4.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.txtBall4.Location = new System.Drawing.Point(162, 12);
            this.txtBall4.Name = "txtBall4";
            this.txtBall4.Size = new System.Drawing.Size(44, 44);
            this.txtBall4.TabIndex = 3;
            this.txtBall4.TextAlign = 
                System.Windows.Forms.HorizontalAlignment.Center;
            // 
            // txtBall5
            // 
            this.txtBall5.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.txtBall5.Location = new System.Drawing.Point(212, 12);
            this.txtBall5.Name = "txtBall5";
            this.txtBall5.Size = new System.Drawing.Size(44, 44);
            this.txtBall5.TabIndex = 4;
            this.txtBall5.TextAlign = 
                System.Windows.Forms.HorizontalAlignment.Center;
            // 
            // txtBall6
            // 
            this.txtBall6.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 24F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.txtBall6.Location = new System.Drawing.Point(262, 12);
            this.txtBall6.Name = "txtBall6";
            this.txtBall6.Size = new System.Drawing.Size(44, 44);
            this.txtBall6.TabIndex = 5;
            this.txtBall6.TextAlign = 
                System.Windows.Forms.HorizontalAlignment.Center;
            // 
            // btnSelect
            // 
            this.btnSelect.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.btnSelect.Location = new System.Drawing.Point(12, 62);
            this.btnSelect.Name = "btnSelect";
            this.btnSelect.Size = new System.Drawing.Size(294, 35);
            this.btnSelect.TabIndex = 6;
            this.btnSelect.Text = "Select Lotto Balls";
            this.btnSelect.UseVisualStyleBackColor = true;
            this.btnSelect.Click += 
                new System.EventHandler(this.btnSelect_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(321, 117);
            this.Controls.Add(this.btnSelect);
            this.Controls.Add(this.txtBall6);
            this.Controls.Add(this.txtBall5);
            this.Controls.Add(this.txtBall4);
            this.Controls.Add(this.txtBall3);
            this.Controls.Add(this.txtBall2);
            this.Controls.Add(this.txtBall1);
            this.Name = "Form1";
            this.Text = "LottoPicks Example";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);
            this.PerformLayout();

}

#endregion

private System.Windows.Forms.TextBox txtBall1;
        private System.Windows.Forms.TextBox txtBall2;
        private System.Windows.Forms.TextBox txtBall3;
        private System.Windows.Forms.TextBox txtBall4;
        private System.Windows.Forms.TextBox txtBall5;
        private System.Windows.Forms.TextBox txtBall6;
        private System.Windows.Forms.Button btnSelect;
    }
}