Invalid index. (Exception from HRESULT: 0x8002000B (DISP_E_BADINDEX))

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ASP.NET

C#3.5

I am trying to get multiple excel sheets in same workbook. I found solution for that. Here is my code...

public void Export(DataTable ds, string filePath)
{
string data = null;
string columnName = null;
int i = 0;
int j = 0;
Excel.Application xlApp;
Excel.Workbook xlWorkBook;
Excel.Worksheet xlWorkSheet=null;
object misValue = System.Reflection.Missing.Value;
Excel.Range range;

xlApp = new Excel.ApplicationClass();
xlWorkBook = xlApp.Workbooks.Add(misValue);

for (int l = 0; l < 4; l++)
       {
           xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(l);
           xlWorkSheet.Cells[1, 1] = "Report";
          // xlWorkSheet.get_Range("A1:D1", Type.Missing).Merge(Type.Missing);
         //  xlWorkSheet.get_Range("A1", "D1").Font.Bold = true;
           xlWorkSheet.Cells.Font.Name = "Courier New";
           xlWorkSheet.Name = "Sheet" + DateTime.Now.Second.ToString();
           columnName = ds.Columns[l].ColumnName.ToString();
           xlWorkSheet.Cells[3, l+1] = columnName;
           data = ds.Rows[1].ItemArray[l].ToString();
           xlWorkSheet.Cells[1, l+1] = data;

}

        xlWorkBook.SaveAs(filePath, Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
        xlWorkBook.Close(true, misValue, misValue);
        xlApp.Quit();

Process[] pros = Process.GetProcesses();
       for (int p = 0; p < pros.Length; p++)
       {
           if (pros[p].ProcessName.ToLower().Contains("excel"))
           {
               pros[p].Kill();
               break;
           }
       }

       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();
       }
   }

but after the creation of third sheet when loop executing for 4th excel sheet error is throwing as "Invalid index. (Exception from HRESULT: 0x8002000B (DISP_E_BADINDEX))". Please help me