System.Diagnostics.TraceListenerCollection.Add C# (CSharp) Method

        public int Add(System.Diagnostics.TraceListener listener) { throw null; }
        public void AddRange(System.Diagnostics.TraceListener[] value) { }

 private void NoConfigInit()
 {
     internalSwitch = new SourceSwitch(sourceName, switchLevel.ToString());
     listeners      = new TraceListenerCollection();
     listeners.Add(new DefaultTraceListener());
     attributes = null;
 }