how do draw motion wave with zedgraph

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C#

hi 1 – I want to draw a sine and sawtooth wave…
2 – And use the timer to draw wave motion
3 - how i can clean chart
4 – and combined two-wave (modulation)? I use this code to draw a triangle wave
(textbox = amplitude – frequency – time) :

GraphPane myPane = zgc.GraphPane;
            // Make up some data points from the Sine function
            PointPairList list1 = new PointPairList();
            double amplitude = double.Parse(textBox2.Text);
            double period = double.Parse(textBox3.Text);
            double y = 0;
            for (double x = 0; x <= double.Parse(textBox1.Text); x += .005)
            {
                double p = (x % (period)) / period;
                if (p >= 0 && p <= 0.25)
                    y = 4 * p * amplitude;
                if (p > 0.25 && p < 0.5)
                    y = amplitude - (p - 0.25) * 4 * amplitude;
                if (p > 0.5 && p <= 0.75)
                    y = -4 * (p - 0.5) * amplitude;
                if (p > 0.75 && p <= 1)
                    y = -(amplitude - (p - 0.75) * 4 * amplitude);
                list1.Add(x, y);
            }
            var line = zg1.MasterPane[0].AddCurve("", list1, Color.Goldenrod);
            line.Symbol.IsVisible = false;
            zg1.AxisChange();
            zg1.Refresh();
            zgc.AxisChange();