using System;
public class AddandRemoveFunctions {
static public void ButtonHandler(object sender, EventArgs e)
{
Console.WriteLine("Button clicked");
}
public static void Main()
{
Button button = new Button();
button.AddClick(new Button.ClickHandler(ButtonHandler));
button.SimulateClick();
button.RemoveClick(new Button.ClickHandler(ButtonHandler));
}
}
public class Button
{
public delegate void ClickHandler(object sender, EventArgs e);
private ClickHandler click;
public void AddClick(ClickHandler clickHandler)
{
click += clickHandler;
}
public void RemoveClick(ClickHandler clickHandler)
{
click -= clickHandler;
}
protected void OnClick()
{
if (click != null)
click(this, null);
}
public void SimulateClick()
{
OnClick();
}
}
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