Mouse Scroll button event

//assuming u r working with window forms

//this would add mousewheel event
this.MouseWheel += new MouseEventHandler(CallMeOnMouseWheelUse);

void private CallMeOnMouseWheelUse(object sender, MouseEventArgs e)
{
            if (e.Delta > 0)
                {
                //mouse wheel up
                this.Cursor=Cursors.Cross;//the plus cursor
                }
            else
                {
               // mouse wheel down
               this.Cursor=Cursors.IBeam;
               //windows doesn't have a "-" sign cursor i guess
                }
}