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private void Form1_Load(object sender, EventArgs e)
{
    button1.Click += new EventHandler(ClickHandler);
    button2.Click += new EventHandler(ClickHandler);
    button3.Click += new EventHandler(ClickHandler);
    button4.Click += new EventHandler(ClickHandler);
}

public void ClickHandler(object sender, EventArgs e)
{
    MessageBox.Show("geklickt: " + ((Button)sender).Name);
}

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public void ButtonCreator(){
 Button btn = new Button();
 btn.Click += new EventHandler(ClickHandler); //Hier kkönnen mit += beliebig viele hinzugefügt werden
 //DoStuff with Button...
}

void ClickHandler(object sender, EventArgs args){
 //DoStuff
}