How to end excel.exe process?

i m trying to get excel sheet-name of a excel file from vb.net 3.5 however it opens but excel.exe still remains in the process. How do i stop the pr开发者_StackOverflowocess without killing the excel.exe from task manager?

i realise new excel.application starts new process.

i tried to use quit, close and dispose.......................nothing worked

Below is my code

   Dim sheetName As New Excel.XlSheetType
   Dim newExcell As New Excel.Application
   Dim newWorkBook As Excel.Workbook = app.Workbooks.Open(MyFileName)
   Dim worksheetName As String
   Dim ws As Excel.Worksheet = CType(WB.Worksheets.Item(1), Excel.Worksheet)
    worksheetName = ws.Name

I cannot use kill because there are other excel application running, so how do i close this particular excel.exe from processor. Please help

This KB article describes the problem.

However, it's not an easy one to solve, as you must ensure you call Marshal.ReleaseComObject on every Excel object you instantiate - and it's very easy to miss one.

For example, the following code implicitly references a Workbooks object:

Dim newWorkBook As Excel.Workbook = app.Workbooks.Open(MyFileName) 

To release the Workbooks object you need to reference it explicitly, so that you have a reference on which you can call Marshal.ReleaseComObject:

Dim objWorkbooks As Excel.Workbooks = app.Workbooks
Dim newWorkbook As Excel.Workbook = objWorkbooks.Open(MyFileName)
...
Marshal.ReleaseComObject(objWorkbooks)
Marshal.ReleaseComObject(newWorkbook)
...

You also should use Try/Finally to ensure ReleaseComObject is called even if an exception is thrown.

Many people don't recommend killing the process; See How to properly clean up Excel interop objects and Understanding Garbage Collection in .net

Edit: On the other hand many people don't recommend using GC.Collect. See What's so wrong about using GC.Collect()?

In my experience killing the process is the fastest and easiest. This code kills only the exact process that it starts, no other.

Be sure to Close any open workbooks, Quit the application, Release the xlApp object. Finally check to see if the process is still alive and if so then kill it.

Here is the code I use: (works every time)

Sub UsingExcel()

    'declare process; will be used later to attach the Excel process
    Dim XLProc As Process

    'call the sub that will do some work with Excel
    'calling Excel in a separate routine will ensure that it is 
    'out of scope when calling GC.Collect
    'this works better especially in debug mode
    DoOfficeWork(XLProc)

    'Do garbage collection to release the COM pointers
    'http://support.microsoft.com/kb/317109
    GC.Collect()
    GC.WaitForPendingFinalizers()

    'I prefer to have two parachutes when dealing with the Excel process
    'this is the last answer if garbage collection were to fail
    If Not XLProc Is Nothing AndAlso Not XLProc.HasExited Then
        XLProc.Kill()
    End If

End Sub

'http://msdn.microsoft.com/en-us/library/ms633522%28v=vs.85%29.aspx
<System.Runtime.InteropServices.DllImport("user32.dll", SetLastError:=True)> _
    Private Shared Function GetWindowThreadProcessId(ByVal hWnd As IntPtr, _
    ByRef lpdwProcessId As Integer) As Integer
End Function

Private Sub ExcelWork(ByRef XLProc As Process)

    'start the application using late binding
    Dim xlApp As Object = CreateObject("Excel.Application")

    'or use early binding
    'Dim xlApp As Microsoft.Office.Interop.Excel

    'get the window handle
    Dim xlHWND As Integer = xlApp.hwnd

    'this will have the process ID after call to GetWindowThreadProcessId
    Dim ProcIdXL As Integer = 0

    'get the process ID
    GetWindowThreadProcessId(xlHWND, ProcIdXL)

    'get the process
    XLProc = Process.GetProcessById(ProcIdXL)


    'do some work with Excel here using xlApp

    'be sure to save and close all workbooks when done

    'release all objects used (except xlApp) using NAR(x)


    'Quit Excel 
    xlApp.quit()

    'Release
    NAR(xlApp)

End Sub

Private Sub NAR(ByVal o As Object)
    'http://support.microsoft.com/kb/317109
    Try
        While (System.Runtime.InteropServices.Marshal.ReleaseComObject(o) > 0)
        End While
    Catch
    Finally
        o = Nothing
    End Try
End Sub

Use the excel application object. Call Quit()

Like for e.g:

Dim app As New Excel.Application    
Try
    '...
    'After doing your stuff
    '...
    app.Quit()
Catch ex As Exception
    'Log your exception
    System.Diagnostics.Print("Error: " + ex.Message)
End Try