Accessing 3DPie Chart using Interop in c# - visual-c#-express-2010

Question

/* Im creating a 3D Pie Chart using the code below. It works fine. The program export the Excel File. What i want to happen now is to disable the Category Name and Value Data Labels. And i want to change the Separator to New Line. How would i do it? Can someone help me with this? Please. Your help will be so much appreciated. Please refer from my codes below. */
private void btnGenerateChart_Click(object sender, EventArgs e){
Excel.Application xlApp;
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet;
object misValue = System.Reflection.Missing.Value;
int x = 2;
xlApp = new Excel.Application();
xlWorkBook = xlApp.Workbooks.Add(misValue);
// Create and select 1st sheet
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
try{
SqlCommand compass = _SqlConnection._SqlCon.CreateCommand();
compass.CommandText = ''sp_SelectRawData'';
compass.CommandType = CommandType.StoredProcedure;
_SqlConnection._SqlCon.Open();
SqlDataReader dreader = compass.ExecuteReader();
xlWorkSheet.Cells[1, 2] = ''Tag I - IV'';
xlWorkSheet.Cells[1, 3] = ''Tag V'';
xlWorkSheet.Cells[1, 4] = ''No Tag'';
while(dreader.Read()){
xlWorkSheet.Cells[x, 1] = dreader.ToString();
xlWorkSheet.Cells[x, 2] = dreader.ToString();
xlWorkSheet.Cells[x, 3] = dreader.ToString();
xlWorkSheet.Cells[x, 4] = dreader.ToString();
x++;
}
dreader.Close();
_SqlConnection._SqlCon.Close();
}
catch(Exception ex){
MessageBox.Show(ex.Message);
}
// Chart range is used to select cells
Excel.Range chartRange;
chartRange = xlWorkSheet.get_Range(''A1'', ''D'' + (x - 1));
chartRange.Columns.EntireColumn.AutoFit();
chartRange = xlWorkSheet.get_Range(''B2'', ''D'' + (x - 1));
chartRange.Columns.NumberFormat = ''_(#,##0.00_);_((#,##0.00);_(\''-\''??_);_(#_)'';
// Create and select 2nd sheet
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(2);
Excel.ChartObjects xlCharts = (Excel.ChartObjects)xlWorkSheet.ChartObjects(Type.Missing);
// Chart size
Excel.ChartObject myChart = (Excel.ChartObject)xlCharts.Add(10, 10, 750, 350);
Excel.Chart chartPage = myChart.Chart;
chartPage.HasLegend = true;
chartPage.ChartTitle.Text = ''Final IAS Provition'';
var xAxis = (Excel.Axis)chartPage.Axes(Excel.XlAxisType.xlValue, Excel.XlAxisGroup.xlPrimary);
xAxis.HasTitle = true;
xAxis.AxisTitle.Text = ''Scale Value'';
var yAxis = (Excel.Axis)chartPage.Axes(Excel.XlAxisType.xlCategory, Excel.XlAxisGroup.xlPrimary);
yAxis.HasTitle = true;
yAxis.AxisTitle.Text = ''Originating Unit'';
// Refer chart data source from the1st sheet
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
chartRange = xlWorkSheet.get_Range(''A1'', ''D'' + (x - 1));
// Go to sheet two
xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(2);
// Set chart data source
chartPage.SetSourceData(chartRange, misValue);
chartPage.ApplyDataLabels();
chartPage.ChartType = Excel.XlChartType.xl3DPie;
chartPage.Rotation = 0;
chartPage.Perspective = Convert.ToInt16(0.1);
xlWorkBook.CheckCompatibility = false;
chartRange.Worksheet.Protect(Password: ''987654321'', AllowFormattingColumns: true, AllowFiltering: true);
xlWorkBook.SaveAs(yourpath + ''.xls'', Excel.XlFileFormat.xlWorkbookNormal, ''123'', misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
xlWorkBook.Close(true, misValue, misValue);
xlApp.Quit();
releaseObject(xlWorkSheet);
releaseObject(xlWorkBook);
releaseObject(xlApp);
}
private void releaseObject(object obj){
try
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
obj = null;
}
catch(Exception ex){
obj = null;
}
finally{
GC.Collect();
}
}