Problem in embedding char in report

[FISCAL]

Hi,

I have a very simple report. Chart control is placed in detail section of the report. Chart is populated using generic list objects. The problem is that when the report is viewed in the browser, chart contains extra x-axis columns. It looks to me the x-axis items are repeated again and again.

Please see the attachment for detail.

Following method is called only once from the page where reportViewer is embedded.
like 

MyReport rpt = new MyReport();
rpt.PlotChart(2,null,null);
rptViewer.Report = rpt;

public void PlotChart(int processID, DateTime? fromInvoiceDate, DateTime? toInvoiceDate)

        {

            try

            {

                myChart.Series.RemoveSeries();

                myChart.ChartTitle.TextBlock.Text = "Days to Payment";

                myChart.DefaultType = ChartSeriesType.Pie;

                IDashboardRepository dashRep = new DashboardRepository();

                List<MockUpChart> chartData = dashRep.GetMockUpChartData(processID, fromInvoiceDate, toInvoiceDate);

                ChartSeries chartSeries = new ChartSeries();

                chartSeries.Name = "Days to Payment";

                chartSeries.Type = ChartSeriesType.Bar;

                foreach (MockUpChart cDatum in chartData)

                {

                    chartSeries.AddItem(cDatum.TotalNoInvoices, cDatum.DaysToPayment.ToString());

                }

                myChart.PlotArea.XAxis.AxisLabel.Visible = false;

                myChart.PlotArea.XAxis.AxisLabel.TextBlock.Text = "Days to Payment";

                //myChart.PlotArea.XAxis.AxisLabel.TextBlock.Appearance.TextProperties.Color = System.Drawing.Color.Red;

                myChart.PlotArea.YAxis.AxisLabel.Visible = false;

                myChart.PlotArea.YAxis.AxisLabel.TextBlock.Text = "Number of Invoices";

                //myChart.PlotArea.YAxis.AxisLabel.TextBlock.Appearance.TextProperties.Color = System.Drawing.Color.Red;

                

                myChart.Series.Add(chartSeries);

                for (int i = 0; i < myChart.Series.Count; i++)

                {

                    myChart.Series[i].Appearance.LabelAppearance.Visible = false;

                }

            }

            catch (Exception ex)

            {

            }

        }