PAssing QueryString to Codebehind in Same aspx page

I'm developijg a web app in .NET 3.5SP1 using VS2008.

I'm having problems when passsing a parameter to the codebehind. The first part of the code below is the javascript used to render a chart by passing parameters to the codebehind, and retrieving the xaml data back that is required to render the chart. The second part is the code behind in the SAME aspx page.

The problem I have is that if I try to populate and bind the GridView within the 'if (Request.Querystring[DataSeriesIndex] == "none")' statement, the Grid isn't getting populated. The ChartXaml is returned OK, but the girdview is always empty. If I remove the GridView binding from the querystring statement, the gridview populates and binds fine. For some reason when trying to populate within this statement, it is preventing the GridView from being populated and binding.

I've tested this by debugging the code line by line, and the Values used to populate the gridview ARE set to the correct values, but for soe reason the gridview isn't binding. I've also tried taking the GridView1.DataBind() out of the statement, and putting it into the 'Finally' part, but this still doesn't work.

I've also tried:

string index =Request.Querystring[DataSeriesIndex];

And then using this for the IF statement, but this does the same thing. And also tried calling a seperate void, if Index =="none".

The code inside the IF statement IS firing, because the ChartXaml is being returned ok. Maybe I need to send a seperate call from javascript? I trying to call the dataTable into javascript and bind in javascript??

Can anyone help here??

function GetXMLHttpObj() {

        try {
            // Firefox, Opera 8.0+, Safari
            objXmlHttp = new XMLHttpRequest();
        }
        catch (e) {
            // Internet Explorer
            try {
                objXmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
            }
            catch (e) {
                try {
                    objXmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
                }
                catch (e) {
                    alert("Your browser does not support AJAX!");
                    return null;
                }
            }
        }
        return objXmlHttp;
    }
    // Loads Visifire Chart
    function onLoad() {
        var xmlHttp1 = GetXMLHttpObj();

        xmlHttp1.onreadystatechange = function() {
            if (xmlHttp1.readyState == 4) {


                vChart.setDataXml(xmlHttp1.responseText.substr(0, xmlHttp1.responseText.indexOf("<!DOCTYPE ")));
                //Added for Drilldown------------------------------
                vChart.preLoad = function(args) {
                    chart = args[0];

                    chart.Series[0].MouseLeftButtonUp = function(e) {

                        OnDataSeries1MouseLeftButtonUp(e.AxisXLabel);
                    };


                    //}
                };
                //-------------------------------                
                vChart.render("Visifire1");
            }
        }

        // Sending request


        xmlHttp1.open("GET", "AnnualEnergyChart.aspx?action=GetXML1&DataSeriesIndex=none&id=" + rID, true); // Request sent for first chart data (GetXML1);
        xmlHttp1.send(null);


        var xmlHttp2 = GetXMLHttpObj();

        xmlHttp2.onreadystatechange = function() {
            if (xmlHttp2.readyState == 4) {

                vChart2.setDataXml(xmlHttp2.responseText.substr(0, xmlHttp2.responseText.indexOf("<!DOCTYPE ")));
        //Added for Drilldown------------------------------
                vChart2.preLoad = function(args) {
                    chart2 = args[0];


                    chart2.Series[0].MouseLeftButtonUp = function(e) {

                        OnDataSeries1MouseLeftButtonUp(e.AxisXLabel);
                    };


        //}
                };
        //----
                vChart2.render("Visifire2");
            }
        }

        // Sending request

        xmlHttp2.open("GET", "AnnualEnergyChart.aspx" + "?action=GetXML2&DataSeriesIndex=none&id=" + rID, true); // Request sent for first chart data (GetXML1);
        xmlHttp2.send(null);
    }


----------------------------------------------------------------
c# code behind in the same page

if (Request.Querystring[DataSeriesIndex] == "none")
                        {
                            
                                dt = Single_Data(sDate, MeterName);
                                if (count == 1)//The following is called only when a single date is selected
                                {
                                    chartXaml1 = chart1_single_dt(dt, SDate, Units, MeterName_Name);
                                    chartXaml2 = chart2_single_dt(dt, SDate, Units, MeterName_Name);
                                }
                                
            DataTable Master = new DataTable();
            double Day_Total1 = new int();
            double Cost1 = new int();
            string Units = " kWh";
            if (dt.Compute("sum(MthData)", "") != DBNull.Value)
            {
                Day_Total1 = System.Convert.ToDouble((dt1.Compute("sum(MthData)", "")));
                Cost1 = System.Convert.ToDouble((dt1.Compute("sum(TotalCost)", "")));
            }
            DataColumn mycolumn1 = new DataColumn();
            mycolumn1.ColumnName = "Meter";
            Master.Columns.Add(mycolumn1);

            DataColumn mycolumn2 = new DataColumn();
            mycolumn2.ColumnName = "Total";
            Master.Columns.Add(mycolumn2);

            DataColumn mycolumn3 = new DataColumn();
            mycolumn3.ColumnName = "Cost";
            Master.Columns.Add(mycolumn3);

            DataRow row = Master.NewRow();
            row["Meter"] = MeterName_Name + " " + DateTime.Parse(sDate).ToString("yyyy");
            row["Total"] = Math.Round(Day_Total1, 0).ToString() + " " + Units;
            row["Cost"] = "£ " + Math.Round(Cost1, 2).ToString();
            Master.Rows.Add(row);
            BoundField Meter = new BoundField();
            Meter.DataField = "Meter";
            Meter.HeaderText = "";
            Meter.ItemStyle.HorizontalAlign = HorizontalAlign.Left;
            Meter.ItemStyle.Width = 400;

            BoundField Total = new BoundField();
            Total.DataField = "Total";
            Total.HeaderText = "Total";
            Total.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
            Total.ItemStyle.Width = 150;

            BoundField Cost = new BoundField();
            Cost.DataField = "Cost";
            Cost.HeaderText = "Cost";
            Cost.ItemStyle.HorizontalAlign = HorizontalAlign.Center;
            Cost.ItemStyle.Width = 150;

            GridView1.Columns.Add(Meter);
            GridView1.Columns.Add(Total);
            GridView1.Columns.Add(Cost);
            GridView1.DataSource = Master;
            GridView1.DataBind();
                        }

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