Excel Process Not Closing after Using "Microsoft.Office.Interop"

Hi,

I am using the following code to open an existing Excel file and saving it as different format.

However the Excel.exe process is not closing...

  

Imports Microsoft.Office.Interop
      
Dim strPath As String
        Dim strFile As String
        Dim strExtension As String
        Dim strPathFile As String

        strPath = "c:\test\"
        strFile = "test"
        strExtension = ".xls"
        strPathFile = strPath + strFile + strExtension



        Try

            Dim xlApp = New Excel.Application
            xlApp.Application.DisplayAlerts = False
            Dim xlWorkBooks As Excel.Workbooks = xlApp.Workbooks
            Dim xlWorkBook As Excel.Workbook = xlWorkBooks.Open(strPathFile, System.Reflection.Missing.Value, System.Reflection.Missing.Value, _
                                                  System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, _
                                                  System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, _
                                                  System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value, _
                                                  System.Reflection.Missing.Value, System.Reflection.Missing.Value, System.Reflection.Missing.Value)
            Dim xlSheets As Excel.Sheets = xlWorkBook.Sheets
            Dim xlWorkSheet As Excel.Worksheet = xlSheets(1)

            strFile = "test2"
            strPathFile = strPath + strFile + strExtension

            xlWorkSheet.SaveAs(strPathFile, Microsoft.Office.Interop.Excel.XlFileFormat.xlExcel8, Type.Missing, Type.Missing, False, False, _
                              Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, _
                              Microsoft.Office.Interop.Excel.XlSaveConflictResolution.xlLocalSessionChanges, Type.Missing, Type.Missing)

            MsgBox("open")
            xlWorkBook.Close()
            xlWorkBooks.Close()
            xlApp.Quit()

            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkSheet)
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlSheets)
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkBook)
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlWorkBooks)
            System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp)

        Catch ex As Exception
            MsgBox("error")
        End Try

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