Releasing Excel after using Interop

Some time ago, I wrote a simple application to fill in and write on disk an Excel spreadsheet. Something like this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Office.Interop.Excel;
using System.Net;
using System.IO;

namespace ExcelInterop
{
    class Program
    {
        static void Main(string[] args)
        {
            Application oXL = null;
            _Workbook oWB = null;
            Workbooks oWBs = null;
            _Worksheet oSheet = null;
            Range oRange = null;

            oXL = new Application();
            oXL.Visible = false;
            oXL.DisplayAlerts = false;

            oWBs = oXL.Workbooks;

            oWB = oWBs.Add(1);

            oSheet = oWB.ActiveSheet;

            oRange = oSheet.Cells[1,1];
            oRange.Value = "Test";

            oWB.SaveAs(@"C:\Temp\Test.xls", XlFileFormat.xlWorkbookNormal, 
                       null, null, false, false, XlSaveAsAccessMode.xlShared, 
                       false, false, null, null, null);

            Console.WriteLine("Before cleanup.");
            Console.ReadKey(false);

            oWB.Close();
            oXL.Quit();

            System.Runtime.InteropServices.Marshal.ReleaseComObject(oRange);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(oSheet);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(oWB);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(oWBs);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(oXL);

            Console.WriteLine("After cleanup.");
            Console.ReadKey(false);
        }
    }
}

Although the program worked as expected, I encountered an annoying problem. The Excel application kept running even after releasing all Interop objects. After some investigation, I realized that the problem was caused by the following two lines of code:

oRange = oSheet.Cells[1,1];
oRange.Value = "Test"

If I comment them out, then after the cleanup, the Excel application will disappear from the list of running processes. But obviously, I needed to set the right value into the cell. So after some Googling, I ended up with the following alternative:

oRange = oSheet.Cells;
oRange.set_Item(1, 1, "Test");

This solution works perfectly, and releases the Excel application after clean up.