diff --git a/SampleApplications/Workshop/DataAccess/Client/MainForm.cs b/SampleApplications/Workshop/DataAccess/Client/MainForm.cs
index 9886c201aa..285dadc47c 100644
--- a/SampleApplications/Workshop/DataAccess/Client/MainForm.cs
+++ b/SampleApplications/Workshop/DataAccess/Client/MainForm.cs
@@ -107,6 +107,9 @@ namespace Quickstarts.DataAccessClient
             try
             {
                 ConnectServerCTRL.Disconnect();
+                m_subscription.Dispose();
+                m_subscription = null;
+                m_session = null;
             }
             catch (Exception exception)
             {