Csharp/C Sharp/GUI Windows Form/Popup Menu

Popup Menu action

<source lang="csharp">

 using System;
 using System.Drawing;
 using System.Collections;
 using System.ruponentModel;
 using System.Windows.Forms;
 using System.Data;
 public class MainForm : System.Windows.Forms.Form
 {
   private int currFontSize = 20;
   private ContextMenu popUpMenu;
   private MenuItem currentCheckedItem;
   private MenuItem checkedHuge;
   private MenuItem checkedNormal;
   private MenuItem checkedTiny;
   public MainForm()
   {
     InitializeComponent();
     Text = "PopUp Menu";
     CenterToScreen();
     popUpMenu = new ContextMenu();
     popUpMenu.MenuItems.Add("Huge", new EventHandler(PopUp_Clicked));
     popUpMenu.MenuItems.Add("Normal", new EventHandler(PopUp_Clicked));
     popUpMenu.MenuItems.Add("Tiny", new EventHandler(PopUp_Clicked));

     this.ContextMenu = popUpMenu;
     checkedHuge = this.ContextMenu.MenuItems[0];
     checkedNormal = this.ContextMenu.MenuItems[1];        
     checkedTiny = this.ContextMenu.MenuItems[2];
     currentCheckedItem = checkedNormal;
     currentCheckedItem.Checked = true;
     this.Resize += new System.EventHandler(this.MainForm_Resize);
     this.Paint += new System.Windows.Forms.PaintEventHandler(this.MainForm_Paint);
   }
   private void InitializeComponent()
   {
     this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
     this.ClientSize = new System.Drawing.Size(292, 273);
     this.Text = "Form1";
   }
   static void Main() 
   {
     Application.Run(new MainForm());
   }
   private void PopUp_Clicked(object sender, EventArgs e) 
   {
     currentCheckedItem.Checked = false;
     MenuItem miClicked = (MenuItem)sender;
     string item = miClicked.Text;
     
     if(item == "Huge")
     {
       currFontSize = 30;
       currentCheckedItem = checkedHuge;
     }
     if(item == "Normal")
     {
       currFontSize = 20;
       currentCheckedItem = checkedNormal;
     }
     if(item == "Tiny")
     {
       currFontSize = 8;
       currentCheckedItem = checkedTiny;
     }
     currentCheckedItem.Checked = true;
     Invalidate();
       }
   private void MainForm_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
   {
     Graphics g = e.Graphics;
     g.DrawString("Right click your mouse", 
       new Font("Times New Roman", (float)currFontSize), 
       new SolidBrush(Color.Black), 
       this.DisplayRectangle);
   }
   private void MainForm_Resize(object sender, System.EventArgs e)
   {
     Invalidate();
   }
 }

      </source>