How do I implement a timer into my elevator to delay the changing of floor?

Question

When a floor button is pressed by a person inside the lift, it calls the method ChangeFloor to inc/decrease the chosen lift's level. Two parameters are passed to the ChangeFloor function; the lift's label(floor indicator) and the button pressed to gain the floor they're on through btn.Name. Tried implementing a timer but can't seem to get it to start? 'timer1' created through the toolbar.

private void FloorButtonClick(object sender, EventArgs e)
    {
        Button btn = (Button)sender;
        if (Convert.ToInt16(btn.Name) > 40)
            if (Convert.ToInt16(btn.Name) > 80)
                if (Convert.ToInt16(btn.Name) > 120)
                    ChangeFloor(lblLiftFloor4, btn);
                else
                    ChangeFloor(lblLiftFloor3, btn);
            else
                ChangeFloor(lblLiftFloor2, btn);
        else
            ChangeFloor(lblLiftFloor1, btn);
    }

 private void ChangeFloor(Label lift, Button btn)
    {
        int level = Convert.ToInt16(lift.Text);
        int desired = Convert.ToInt16(btn.Tag);

        while( level!=desired )
        {
            if (level > desired)
            {
                timer1.Start();
                lift.Text = (--level).ToString();
            }
            else
            {
                timer1.Start();
                lift.Text = (++level).ToString();
            }

        }
    }

Answer 1

I am not sure what you are trying to do exactly... if you just want to simulate the changing of floors and introduce a delay, you could just throw in a Sleep statement which will cause your app to pause for a given amount of time.

private void ChangeFloor(Label lift, Button btn)
{
    int level = Convert.ToInt16(lift.Text);
    int desired = Convert.ToInt16(btn.Tag);

    while( level!=desired )
    {
        Thread.Sleep(3000);  // <--- Pause for 3 seconds...
        if (level > desired)
        {
            lift.Text = (--level).ToString();
        }
        else
        {
            lift.Text = (++level).ToString();
        }

    }
}

EDIT: Read up of threading because if you want a bunch of independent elevators. Threads are what you could implement to achieve the behavior you're looking for:

http://msdn.microsoft.com/en-us/library/System.Threading(v=vs.110).aspx