Передача данных из dataSet в Excel

Excel.Application app = new Excel.ApplicationClass();
Excel.Workbook wb = new Excel.WorkbookClass();

Excel.Application app = null;
Excel.Workbooks wbs = null;
Excel.Workbook wb = null;
Excel.Worksheet ws = null;

try
{
    app = new Excel.ApplicationClass();
    app.Visible = true;

wbs = (Excel.Workbooks)(app.GetType().InvokeMember("Workbooks",BindingFlags.GetProperty, null, app, null));
wb = (Excel.Workbook)(wbs.GetType().InvokeMember("Add",BindingFlags.InvokeMethod, null, wbs, null));

ws = (Excel.Worksheet)wb.ActiveSheet;
Excel.Range range = null;

for(int i=0; i<this.dataSet2.Tables[0].Rows.Count;i++)
  for(int j=0;j<this.dataSet2.Tables[0].Columns.Count;j++)
    {
        range = (Excel.Range)ws.Cells[i+1,j+1];    
        range.Value2 = this.dataSet2.Tables[0].Rows.ItemArray.GetValue(j).ToString();
           
         }         
   
    System.Runtime.InteropServices.Marshal.ReleaseComObject(range);
}
finally
{
    if (ws != null)
        System.Runtime.InteropServices.Marshal.ReleaseComObject(ws);
    if (wb != null)
        System.Runtime.InteropServices.Marshal.ReleaseComObject(wb);
    if (app != null)
    {
        System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
        GC.Collect();
        GC.WaitForPendingFinalizers();
        GC.Collect();  
    }      
}