void SetTracing()
{
if (InitializedLogs.Contains(_fileNamePrefix)) return;
var fileStream = GetFileStream(_fileNamePrefix);
var listener = new TextWriterTraceListener(fileStream) {TraceOutputOptions = TraceOptions.DateTime};
Trace.Listeners.Add(listener);
Trace.AutoFlush = true;
InitializedLogs.Add(_fileNamePrefix);
}