Csharp/CSharp Tutorial/GUI Windows Forms/CheckBox

Add CheckBox to a Form

<source lang="csharp">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;

}</source>

Change Label font by CheckBoxes

<source lang="csharp">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);
 }

}</source>

CheckedChanged event for CheckBox

<source lang="csharp">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);
    }

}</source>