Question

Exactly where I must write this code?

button1.MouseHover += Common_MouseHover;

The problem is I want to declare one event handler and point each button at it. This is the common handler:

private void Common_MouseHover(object sender, EventArgs e)
{
     Button btn = sender as Button;
     if (btn != null)
         btn.Image = pic
}

But I dont know where i must write:

button1.MouseHover += Common_MouseHover;
utton2.MouseHover += Common_MouseHover;
.. etc

In designer? Where exactly?

Answer 1

Either in the designer or the Constructor of your Form or if you are creating dynamic Buttons at the time of creation.

public Form1()
{
    InitializeComponent();

    button1.MouseHover += new EventHandler(Common_MouseHover);
    button2.MouseHover += new EventHandler(Common_MouseHover);

}

If in the Property Editor.