Excel.exe 프로세스 죽이기

using System.Diagnostics;
using System.Collections;
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Hashtable myHashtable;
private void btnExport_Click(object sender, EventArgs e)
{
  // get process ids before running the excel codes
  CheckExcellProcesses();

  // export to excel
  ExportDataToExcel();

  // kill the right process after export completed
  KillExcel();
}

private void ExportDataToExcel()
{
  // your export process is here...
}

private void CheckExcellProcesses()
{
  Process[] AllProcesses = Process.GetProcessesByName("excel");
  myHashtable = new Hashtable();
  int iCount = 0;

  foreach ( Process ExcelProcess in AllProcesses) { 
    myHashtable.Add(ExcelProcess.Id, iCount);
    iCount = iCount + 1;
  } 
}

private void KillExcel()
{
  Process[] AllProcesses = Process.GetProcessesByName("excel");

   // check to kill the right process
  foreach ( Process ExcelProcess in AllProcesses) {
    if (myHashtable.ContainsKey(ExcelProcess.Id) == false)
       ExcelProcess.Kill(); 
  }

  AllProcesses = null;
}

내가 실행한 프로세스를 찾아 죽이는 방법.....