Application not released from Task Manager [duplicate] - vb.net

Question

This question already has answers here:
Application not quitting after calling quit
(11 answers)
Closed 7 years ago.
I'm trying to write some data from my windowsform into a Excel file, this works.
' Excel load data
Dim oExcelApp As New Microsoft.Office.Interop.Excel.Application
Dim oWorkBook As Microsoft.Office.Interop.Excel.Workbook
Dim oWorkSheet As Microsoft.Office.Interop.Excel.Worksheet
oWorkBook = oExcelApp.Workbooks.Open("C:\Temp\Test.xlsx")
oWorkSheet = oWorkBook.Worksheets(1)
oWorkSheet.Range("A1").Value = "Test"
oWorkBook.Save()
oWorkBook.Close()
Problem is: When I am done Excel is still running in my task manager. When I press the button like 10 times there are 10 Excel references in my task manager.
Question: How can I fully unload Excel after writing the value into the Excel?

Answer 1

You need to Quit Microsoft Excel and then release the objects.
Code referenced from this answer: The proper way to dispose Excel com object using VB.NET? and Excel application not quitting after calling quit
'Excel load data
Dim oExcelApp As New Microsoft.Office.Interop.Excel.Application
Dim oWorkBook As Microsoft.Office.Interop.Excel.Workbook
Dim oWorkSheet As Microsoft.Office.Interop.Excel.Worksheet
oWorkBook = oExcelApp.Workbooks.Open("C:\Temp\Test.xlsx")
oWorkSheet = oWorkBook.Worksheets(1)
oWorkSheet.Range("A1").Value = "Test"
oWorkBook.Save()
oWorkBook.Close()
oExcelApp.Quit()
'Release object references.
releaseObject(oWorkSheet)
releaseObject(oWorkBook)
releaseObject(oExcelApp)
----------------------------------------------------------------------------
Private Sub releaseObject(ByVal obj As Object)
Try
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj)
obj = Nothing
Catch ex As Exception
obj = Nothing
Finally
GC.Collect()
End Try
End Sub

Answer 2

You have to close the connection you just opened. You can do this by adding this line after your current code:
oExcelApp.Quit();
Source & more information: here
More information about the quit() method here.
Important: if you have open workbooks that are not saved yet, this method will show a dialog box asking to save.
If you don't want this, you either have to (1): save all open workbooks or (2) setting DisplayAlerts to false.
(1)
workbooks.Save()
(2)
oExcelApp.DisplayAlerts = false