Kill Process from task manager

Question

I did a project in vb.net, 3.5 framework using Visual Studio 2008.My Question is regarding killing the process from task manager. Whenever I am exiting my application by the Close button ('X') or an Exit button (P.S here 'Exit' is a button in the windows application) the process exists in the task manager and I had to remove it manually. I don't want to do that. The name of the process is iMaxAutotech.exe. I have used this code under form_closing event and in the exit button but it's not working ..grrh!!!

Under Exit Button :

Private Sub Exit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Dim mresult As MsgBoxResult
        mresult = MsgBox("Are you sure you want to exit?", MsgBoxStyle.YesNo)
        If mresult = MsgBoxResult.Yes Then
            Me.Close()
        End If
        Dim plist As Process() = Process.GetProcesses()
        For Each p As Process In plist
            Try
                If p.MainModule.ModuleName.ToUpper() = "iMaxAutotech.exe" Then p.Kill()
            Catch
                'seems listing modules for some processes fails, so better ignore any exceptions here
            End Try
        Next p
    End Sub

and in the Form Closing Event :

Private Sub Form3_FormClosing(ByVal sender As System.Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles MyBase.FormClosing
        Dim plist As Process() = Process.GetProcesses()
        For Each p As Process In plist
            Try
                If p.MainModule.ModuleName.ToUpper() = "iMaxAutotech.exe" Then p.Kill()
            Catch
                'seems listing modules for some processes fails, so better ignore any exceptions here
            End Try
        Next p
    End Sub


I want the vb.net code for that,can any1 help me plz plz.It's very urgent ...Thanks in advance