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20181130
StopWatch

            var sw = new System.Diagnostics.Stopwatch();
            sw.Start();
            Text = "Start";
            mLog.Info(Text);
            System.Threading.Thread.Sleep(200);

            sw.Stop();
            mLog.Info($"1= {sw.ElapsedMilliseconds:n0}ms");

            sw.Restart();
            Text = "Restart";
            mLog.Info(Text);
            System.Threading.Thread.Sleep(200);
            sw.Stop();
            mLog.Info($"2= {sw.ElapsedMilliseconds:n0}ms");

            Text = "Done";