private void Form1_MouseWheel(object sender, MouseEventArgs e)
    {
        Debug.WriteLine("Foo");
    }

namespace BlahBlah
{
    public partial class Form1 : Form
    {

private void Form1_MouseClick(object sender, MouseEventArgs e)
    {
        Debug.WriteLine("Foo");
    }

this.MouseWheel+= new MouseEventHandler(Form1_MouseWheel);