Steema Central

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        private void button1_Click(object sender, EventArgs e)
        {        
            tower1.FillSampleValues(40);
        }

        private DateTime startTime, now; 

        private void tChart1_BeforeDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
        {
            label1.Text = "";
            startTime = DateTime.Now; 
        }

        private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g)
        {
            //calculate elapsed time         
            now = DateTime.Now;
            TimeSpan elapsedTime = new TimeSpan(now.Ticks - startTime.Ticks);
            int total = (elapsedTime.Seconds * 1000) + elapsedTime.Milliseconds;

            label1.Text = "Elapsed time: " + total.ToString() + " ms";
        }