export chart at runtime

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C#

Hi i am using export function to export the charts to pdf. it works fine and good.I have options to change the type of the chart at runtime using dropdownlist.when the chart type is changed and when i try to export it the default type while pageload is exported. i Want to export the changed chart type .Is there any solution for this.

i am using asp.net,c# with itextsharp.dll to export. At pageload the default chart type is pie. i change the type of the chart using dropdown list.

 protected void ddlChType_SelectedIndexChanged(object sender, EventArgs e)
    {
if (IsPostBack)
       {
           if (ddlChType.SelectedIndex == 1)
           {
               saleChart.Series[0].ChartType = SeriesChartType.Pie;
           }
           //if (ddlChType.SelectedItem.Text.ToLower() == "pie")
           //{
           //    saleChart.Series[0].ChartType = SeriesChartType.Pie;
           //}
           else if (ddlChType.SelectedIndex ==5)
           {
               saleChart.Series[0].ChartType = SeriesChartType.Funnel;
           }
           else if (ddlChType.SelectedIndex ==3)
           {
               saleChart.Series[0].ChartType = SeriesChartType.Bar;
           }
           else if (ddlChType.SelectedIndex ==2)
           {
               saleChart.Series[0].ChartType = SeriesChartType.Column;
           }
           else if (ddlChType.SelectedIndex ==4)
           {
               saleChart.Series[0].ChartType = SeriesChartType.Line;
           }
           else
           {
               saleChart.Series[0].ChartType = SeriesChartType.Pie;
           }
       }
   }

when the type is changed and exported ,the default view is exported as pie.but i need to export the chart as changed type.