Java vs. C#

Event Handler

Java
 
import java.awt.event.ActionListener;
public class Form1 extends java.awt.Frame implements ActionListener {
    java.awt.Button button1 = new Button();
    public void actionPerformed(ActionEvent ae) {
        System.out.println("button1 was clicked!");
    }
    button1.addActionListener(this);
    ...
}

C#
 
public delegate void EventHandler(object sender, System.EventArgs e);
public class Button 
{
    private EventHandler handler;
    
    public event EventHandler Click {
        add { handler += value; }
        remove { handler -= value; }
    }

}
public class Form1 
{
    public Form1() {
        // Add Button1_Click as an event handler for Button1's Click event
        Button1.Click += new EventHandler(Button1_Click);
    }
    Button Button1 = new Button();
    void Button1_Click(object sender, EventArgs e) {
        Console.WriteLine("Button1 was clicked!");
    }
    public void Disconnect() {
        Button1.Click -= new EventHandler(Button1_Click);
    }
}