The code:

```
private void Form1_MouseWheel(object sender, MouseEventArgs e)
        {
            if (leave == true)
            {
                timer1.Interval = 10;
            }
        }

```

I want to do that if i turn the mouse wheel to my side down it will slow the timer will increase the interval and if i turn the wheel up it will decrease the interval.

How can i do it ?