using System;
using System.Windows.Forms;
 
 
public class Form1 : Form
{
 
        public Form1()
        {
                this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form_MouseClick);
        }
 
        static public void Main()
        {
                Application.Run(new Form1());
        }
 
        private void Form_MouseClick(Object sender, MouseEventArgs e)
        {
 
                switch (e.Button) {
                case MouseButtons.Left:
                        MessageBox.Show(this,"Bal egérgomb lenyomva");
                        break;
                case MouseButtons.Right:
                        MessageBox.Show(this,"Jobb egérgomb lenyomva" );
                        break;
                case MouseButtons.Middle:
			MessageBox.Show(this,"Középső egérgomb lenyova" );
                        break;
                default:
                        break;
                }
        }
 
 
}

ActiveForm.Refresh();

using System;
using System.Drawing;
using System.Windows.Forms;
 
class Program : Form
{
	Label cimke1;
	Program()
	{
		cimke1 = new Label();
 
		cimke1.Text = "Helló Világ";
		cimke1.Location = new Point(200, 200);
		cimke1.MouseEnter += new EventHandler(Cimke_MouseEnter);
		cimke1.MouseLeave += new EventHandler(Cimke_MouseLeave);
 
		Controls.Add(cimke1);
		Width = 800;
		Height = 600;
	}
	private void Cimke_MouseEnter(object sender, EventArgs e)
	{
		cimke1.Text = "Rajta";
	}
	private void Cimke_MouseLeave(object sender, EventArgs e)
	{
		cimke1.Text = "Helló Világ";
	}
	public static void Main()
	{
		Application.Run(new Program());
	}
}