DisplayPersons Source Code

DisplayPersons Example, source code file Person.cs

/// <summary>
/// DisplayPersons Example, source code file Person.cs
/// Person class with properties Name, Gender, and Age
/// Methods are HaveBirthday and ToString
/// </summary>

public class Person
{
    // Instance variables
    private string _name;
    private char _gender;
    private int _age;

// Constructors
    public Person()
    {
        _name = "Unknown";
        _gender = 'U';
        _age = -1;
    }

public Person(string theName, char theGender, int theAge)
    {
        // Name cannot be the empty string.
        if (theName != "")
        {
            _name = theName;
        }
        else
        {
            _name = "Unknown";
        }

// Gender must be 'F' or 'M'.
        if (theGender == 'F' || theGender == 'M')
        {
            _gender = theGender;
        }
        else
        {
            _gender = 'U';
        }

// Age must be nonnegative.  -1 means illegal age.
        if (theAge >= 0)
        {
            _age = theAge;
        }
        else
        {
            _age = -1;
        }
    }

// Read only property
    public string Name
    {
        get { return _name; }
    }

// Read only property
    public char Gender
    {
        get { return _gender; }
    }

// Read/write property
    public int Age
    {
        get { return _age; }

set
        {
            if (value >= 0)
            {
                _age = value;
            }
            else
            {
                _age = -1;
            }
        }
    }

public void HaveBirthday()
    {
        if (_age >= 0)
        {
            _age++;
        }
    }

public override string ToString()
    {
        return "Name " + _name + "Gender: " + _gender + "Age: " + _age;
    }
}

DisplayPersons Example, source code file Form1.cs

using System;
using System.Collections;
using System.Windows.Forms;

/// <summary>
/// DisplayPersons Example, source code file Form1.cs
/// Create and store Person objects in an ArrayList 
/// collection. Access the objects via a combobox.
/// </summary>

namespace DisplayPersons
{
    public partial class Form1 : Form
    {
        // The arraylist collection is an instance variable.
        private ArrayList col = null;

public Form1()
        {
            InitializeComponent();
        }

private void Form1_Load(object sender, EventArgs e)
        {
            // Instantiate arraylist collection.
            col = new ArrayList();
        }

private void btnAddPerson_Click(object sender, EventArgs e)
        {
            // Obtain gender.
            char gender;
            if (radF.Checked)
            {
                gender = 'F';
            }
            else
            {
                gender = 'M';
            }

// Instantiate new person object with information from form.
            Person p = new Person(txtName.Text, 
                gender, int.Parse(txtAge.Text));

// Add new Person object to collection.
            col.Add(p);

// Add name of new Person object to combobox.
            cboPersons.Items.Add(p.Name);
        }

private void cboPersons_SelectedIndexChanged(
            object sender, EventArgs e)
        {
            // Find index of selected person in combo box.
            int i = cboPersons.SelectedIndex;

// Set reference to selected person in combo box.
            Person p = (Person) col[i];

// Display person data on form.
            txtName.Text = p.Name;
            if (p.Gender == 'M')
            {
                radM.Checked = true;
            }
            else
            {
                radF.Checked = true;
            }
            txtAge.Text = p.Age.ToString();
        }

private void btnDeletePerson_Click(object sender, EventArgs e)
        {
            // Find index of selected person in combo box.
            int i = cboPersons.SelectedIndex;

// Remove name of selected person from combo box.
            cboPersons.Items.RemoveAt(i);

// Remove selected person from collection.
            col.RemoveAt(i);

// Clear person data from form.
            txtName.Clear();
            txtAge.Text = "-1";
            radF.Checked = false;
            radM.Checked = false;

// No name should be selected in combobox.
            cboPersons.SelectedIndex = -1;
        }

private void btnHaveBirthday_Click(object sender, EventArgs e)
        {
            // Find index of selected person in combo box.
            int i = cboPersons.SelectedIndex;

// Exit method if no person is selected.
            if (i < 0)
            {
                return;
            }

// Set reference to selected person in combo box.
            Person p = (Person) col[i];

// Call HaveBirthday method.
            p.HaveBirthday();

// Display new person data on form.
            txtName.Text = p.Name;
            if (p.Gender == 'M')
            {
                radM.Checked = true;
            }
            else
            {
                radF.Checked = true;
            }
            txtAge.Text = p.Age.ToString();
        }
    }
}

DisplayPersons Example, source code file Form1.Designer.cs

namespace DisplayPersons
{
    partial class Form1
    {
        /// <summary>
        /// DisplayPersons Example, source code file Form1.Designer.cs
        /// 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.cboPersons = new System.Windows.Forms.ComboBox();
            this.txtName = new System.Windows.Forms.TextBox();
            this.label1 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.txtAge = new System.Windows.Forms.TextBox();
            this.btnHaveBirthday = new System.Windows.Forms.Button();
            this.btnAddPerson = new System.Windows.Forms.Button();
            this.btnDeletePerson = new System.Windows.Forms.Button();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.radF = new System.Windows.Forms.RadioButton();
            this.radM = new System.Windows.Forms.RadioButton();
            this.groupBox1.SuspendLayout();
            this.SuspendLayout();
            // 
            // cboPersons
            // 
            this.cboPersons.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.cboPersons.FormattingEnabled = true;
            this.cboPersons.Location = new System.Drawing.Point(12, 12);
            this.cboPersons.Name = "cboPersons";
            this.cboPersons.Size = new System.Drawing.Size(241, 28);
            this.cboPersons.TabIndex = 0;
            this.cboPersons.SelectedIndexChanged += 
                new System.EventHandler(this.cboPersons_SelectedIndexChanged);
            // 
            // txtName
            // 
            this.txtName.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.txtName.Location = new System.Drawing.Point(87, 58);
            this.txtName.Name = "txtName";
            this.txtName.Size = new System.Drawing.Size(166, 26);
            this.txtName.TabIndex = 1;
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label1.Location = new System.Drawing.Point(12, 58);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(55, 20);
            this.label1.TabIndex = 2;
            this.label1.Text = "Name";
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.label3.Location = new System.Drawing.Point(12, 159);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(41, 20);
            this.label3.TabIndex = 5;
            this.label3.Text = "Age";
            // 
            // txtAge
            // 
            this.txtAge.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.txtAge.Location = new System.Drawing.Point(87, 156);
            this.txtAge.Name = "txtAge";
            this.txtAge.Size = new System.Drawing.Size(166, 26);
            this.txtAge.TabIndex = 6;
            this.txtAge.Text = "-1";
            this.txtAge.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
            // 
            // btnHaveBirthday
            // 
            this.btnHaveBirthday.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.btnHaveBirthday.Location = new System.Drawing.Point(87, 194);
            this.btnHaveBirthday.Name = "btnHaveBirthday";
            this.btnHaveBirthday.Size = new System.Drawing.Size(166, 35);
            this.btnHaveBirthday.TabIndex = 7;
            this.btnHaveBirthday.Text = "Have Birthday";
            this.btnHaveBirthday.UseVisualStyleBackColor = true;
            this.btnHaveBirthday.Click += 
                new System.EventHandler(this.btnHaveBirthday_Click);
            // 
            // btnAddPerson
            // 
            this.btnAddPerson.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.btnAddPerson.Location = new System.Drawing.Point(87, 235);
            this.btnAddPerson.Name = "btnAddPerson";
            this.btnAddPerson.Size = new System.Drawing.Size(166, 35);
            this.btnAddPerson.TabIndex = 8;
            this.btnAddPerson.Text = "Add Person";
            this.btnAddPerson.UseVisualStyleBackColor = true;
            this.btnAddPerson.Click += 
                new System.EventHandler(this.btnAddPerson_Click);
            // 
            // btnDeletePerson
            // 
            this.btnDeletePerson.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.btnDeletePerson.Location = new System.Drawing.Point(87, 276);
            this.btnDeletePerson.Name = "btnDeletePerson";
            this.btnDeletePerson.Size = new System.Drawing.Size(166, 35);
            this.btnDeletePerson.TabIndex = 9;
            this.btnDeletePerson.Text = "Delete Person";
            this.btnDeletePerson.UseVisualStyleBackColor = true;
            this.btnDeletePerson.Click += 
                new System.EventHandler(this.btnDeletePerson_Click);
            // 
            // groupBox1
            // 
            this.groupBox1.Controls.Add(this.radM);
            this.groupBox1.Controls.Add(this.radF);
            this.groupBox1.Font = new System.Drawing.Font(
                "Microsoft Sans Serif", 9.75F, System.Drawing.FontStyle.Bold, 
                System.Drawing.GraphicsUnit.Point, ((byte)(0)));
            this.groupBox1.Location = new System.Drawing.Point(16, 90);
            this.groupBox1.Name = "groupBox1";
            this.groupBox1.Size = new System.Drawing.Size(237, 55);
            this.groupBox1.TabIndex = 10;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "Gender";
            // 
            // radF
            // 
            this.radF.AutoSize = true;
            this.radF.Checked = true;
            this.radF.Location = new System.Drawing.Point(27, 21);
            this.radF.Name = "radF";
            this.radF.Size = new System.Drawing.Size(78, 20);
            this.radF.TabIndex = 11;
            this.radF.TabStop = true;
            this.radF.Text = "Female";
            this.radF.UseVisualStyleBackColor = true;
            // 
            // radM
            // 
            this.radM.AutoSize = true;
            this.radM.Location = new System.Drawing.Point(138, 21);
            this.radM.Name = "radM";
            this.radM.Size = new System.Drawing.Size(60, 20);
            this.radM.TabIndex = 12;
            this.radM.TabStop = true;
            this.radM.Text = "Male";
            this.radM.UseVisualStyleBackColor = true;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(284, 323);
            this.Controls.Add(this.groupBox1);
            this.Controls.Add(this.btnDeletePerson);
            this.Controls.Add(this.btnAddPerson);
            this.Controls.Add(this.btnHaveBirthday);
            this.Controls.Add(this.txtAge);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label1);
            this.Controls.Add(this.txtName);
            this.Controls.Add(this.cboPersons);
            this.Name = "Form1";
            this.Text = "DisplayPersons Example";
            this.Load += new System.EventHandler(this.Form1_Load);
            this.groupBox1.ResumeLayout(false);
            this.groupBox1.PerformLayout();
            this.ResumeLayout(false);
            this.PerformLayout();

}

#endregion

private System.Windows.Forms.ComboBox cboPersons;
        private System.Windows.Forms.TextBox txtName;
        private System.Windows.Forms.Label label1;
        private System.Windows.Forms.Label label3;
        private System.Windows.Forms.TextBox txtAge;
        private System.Windows.Forms.Button btnHaveBirthday;
        private System.Windows.Forms.Button btnAddPerson;
        private System.Windows.Forms.Button btnDeletePerson;
        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.RadioButton radM;
        private System.Windows.Forms.RadioButton radF;
    }
}