service control permission problem as the same code works in vb.net application

hi,

I have the following code for my webmethod to control the Print Spooler service although Im getting a webby permission problem because copying the code into a vb.net application works perfectly.

Any ideas what permissions I need to set?  Many thanks


    <WebMethod()> _
    Public Function test() As String
        Dim sc As ServiceController

        Try
            For Each sc In ServiceController.GetServices()
                If sc.DisplayName.Equals("Print Spooler") Then Exit For
            Next

            If sc.Status = ServiceControllerStatus.Stopped Then
                ' Start the service if its stopped

                Try
                    ' Start the service, and wait until its status is "Running".
                    sc.Start()
                    sc.WaitForStatus(ServiceControllerStatus.Running)
                Catch ex As Exception
                    Return "11111 " & ex.Message
                End Try

            End If

        Catch ex As Exception
            Return "22222 " & ex.Message
        End Try
    End Function