Csharp/CSharp Tutorial/GUI Windows Forms/CheckBox

Add CheckBox to a Form

using System;
using System.Windows.Forms;
public class CheckBoxFormDemo{
    [STAThread]
    public static void Main(string[] args)
    {
        Application.Run(new CheckBoxForm());
    }
}
public partial class CheckBoxForm : Form
{
    public CheckBoxForm()
    {
        InitializeComponent();
    }
    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        string[] foods = {"A", "B", "C", "D","E","F","G","H","I","J"};
        this.SuspendLayout();
        int topPosition = 10;
        foreach (string food in foods)
        {
            CheckBox checkBox = new CheckBox();
            checkBox.Top = topPosition;
            checkBox.Left = 10;
            checkBox.Text = food;
            topPosition += 30;
            panel1.Controls.Add(checkBox);
        }
        this.ResumeLayout();
    }
}
partial class CheckBoxForm
{
    private System.ruponentModel.IContainer components = null;
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }
    #region Windows Form Designer generated code
    private void InitializeComponent()
    {
        this.panel1 = new System.Windows.Forms.Panel();
        this.SuspendLayout();
        // 
        // panel1
        // 
        this.panel1.AutoScroll = true;
        this.panel1.Dock = System.Windows.Forms.DockStyle.Fill;
        this.panel1.Location = new System.Drawing.Point(0, 0);
        this.panel1.Name = "panel1";
        this.panel1.Size = new System.Drawing.Size(292, 266);
        this.panel1.TabIndex = 0;
        // 
        // CheckBoxForm
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.Add(this.panel1);
        this.Name = "CheckBoxForm";
        this.Text = "CheckBoxForm";
        this.ResumeLayout(false);
    }
    #endregion
    private System.Windows.Forms.Panel panel1;
}

Change Label font by CheckBoxes

using System;
using System.Drawing;
using System.Windows.Forms;
public class LabelFontChangedByCheckBoxes : Form
{
  Label lbl;
  Panel pnl;
  FontStyle[] theStyles;
  public LabelFontChangedByCheckBoxes()
  {
    Size = new Size(300,250);
    lbl = new Label();
    lbl.Parent = this;
    lbl.Text = "test";
    lbl.Location = new Point(0,0);
    lbl.AutoSize = true;
    lbl.BorderStyle = BorderStyle.Fixed3D;
    int yDelta = lbl.Height + 10;
    
    FontStyle theEnum = new FontStyle();
    theStyles = (FontStyle[])Enum.GetValues(theEnum.GetType());
    pnl = new Panel();
    pnl.Parent = this;
    pnl.Location = new Point(0, yDelta );
    pnl.Size = new Size(150, (theStyles.Length + 1) * yDelta);
    pnl.BorderStyle = BorderStyle.FixedSingle;

    int i = 1;
    CheckBox cb;
    foreach (FontStyle style in theStyles)
    {
      cb = new CheckBox();
      cb.Parent = pnl;
      cb.Location = new Point(25, (yDelta * (i - 1)) + 10);
      cb.Size = new Size(75,20);
      cb.Text = style.ToString();
      cb.Tag = style;
      cb.CheckedChanged += new System.EventHandler(cb_CheckedChanged);
      if (cb.Text == "Regular")
        cb.Checked = true;
      i++;
    }
  }
  static void Main() 
  {
    Application.Run(new LabelFontChangedByCheckBoxes());
  }
  private void cb_CheckedChanged(object sender, EventArgs e)
  {
    FontStyle fs = 0;
    for (int i = 0; i < pnl.Controls.Count; i++)
    {
      CheckBox cb = (CheckBox)pnl.Controls[i];
      if (cb.Checked)
        fs |= (FontStyle)cb.Tag;
      if (((CheckBox)pnl.Controls[i]).Checked)
        fs |= (FontStyle)((CheckBox)pnl.Controls[i]).Tag;
    }
    lbl.Font = new Font(lbl.Font, fs);
  }
}

CheckedChanged event for CheckBox

using System;
using System.Drawing;
using System.Windows.Forms;
   
class CheckBoxDemo: Form
{
     public static void Main()
     {
          Application.Run(new CheckBoxDemo());
     }
     public CheckBoxDemo()
     {
          CheckBox[] achkbox  = new CheckBox[4];
          int        cyText   = Font.Height;
          int        cxText   = cyText / 2;
          string[]   astrText = {"Bold", "Italic", "Underline", "Strikeout"};
   
          for (int i = 0; i < 4; i++){
               achkbox[i] = new CheckBox();
               achkbox[i].Text = astrText[i];
               achkbox[i].Location = new Point(2 * cxText, (4 + 3 * i) * cyText / 2);
               achkbox[i].Size = new Size(12 * cxText, cyText);
               achkbox[i].CheckedChanged += new EventHandler(CheckBoxOnCheckedChanged);
          }
          Controls.AddRange(achkbox);
     }
     void CheckBoxOnCheckedChanged(object obj, EventArgs ea)
     {
          Invalidate(false);
     }
     FontStyle[] afs  = { FontStyle.Bold,FontStyle.Italic, FontStyle.Underline, FontStyle.Strikeout };
     FontStyle   fs   = 0;     
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics    grfx = pea.Graphics;
          for (int i = 0; i < 4; i++){
               if (((CheckBox) Controls[i]).Checked){
                    fs |= afs[i];
               }
          }
          grfx.DrawString(Text, new Font(Font, fs), new SolidBrush(ForeColor), 0, 0);
     }
}