--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab/Diagnostics/ActivityScope.cs	Mon Feb 12 17:03:37 2018 +0300
@@ -0,0 +1,29 @@
+using System;
+using System.Diagnostics;
+
+namespace Implab.Diagnostics {
+    public class ActivityScope : IDisposable {
+        readonly TraceSource m_source;
+
+        readonly Guid m_prevId;
+
+        readonly string m_activity;
+
+        readonly int m_code;
+
+        internal ActivityScope(TraceSource source, Guid prevId, int code, string activity) {
+            m_source = source;
+            m_prevId = prevId;
+            m_code = code;
+            m_activity = activity;
+        }
+
+
+        public void Dispose() {
+            if (Trace.CorrelationManager.ActivityId != m_prevId)
+                m_source.TraceTransfer(m_code, "Transfer", m_prevId);
+            m_source.TraceEvent(TraceEventType.Stop, 0, m_activity);
+            Trace.CorrelationManager.ActivityId = m_prevId;
+        }
+    }
+}
\ No newline at end of file