Cannot open service on computer in vb.net 1.1

Hi,
 i wants to access window service with ServiceController . But when i try to start or stop the service it gives following error :
 
-    ex    {System.InvalidOperationException}    System.Exception
+    [System.InvalidOperationException]    {System.InvalidOperationException}    System.InvalidOperationException
    HelpLink    Nothing    String
+    InnerException    {System.ComponentModel.Win32Exception}    System.Exception
    Message    "Cannot open BackEndScheduler service on computer '.'."    String
    Source    "System.ServiceProcess"    String
    StackTrace    "   at System.Ser ...