Applied patch from Enrique Garcia to copy the 509 certificates to internal list. Thanks, Enrique!
Fixes [AMQNET-500]. (See https://issues.apache.org/jira/browse/AMQNET-500)

diff --git a/src/main/csharp/Transport/Tcp/SslTransport.cs b/src/main/csharp/Transport/Tcp/SslTransport.cs
index caa3ec7..17f2e06 100644
--- a/src/main/csharp/Transport/Tcp/SslTransport.cs
+++ b/src/main/csharp/Transport/Tcp/SslTransport.cs
@@ -314,7 +314,9 @@
 
                 X509Store store = new X509Store(name, location);
                 store.Open(OpenFlags.ReadOnly);
-                collection = store.Certificates;
+                X509Certificate2[] certificates = new X509Certificate2[store.Certificates.Count];
+                store.Certificates.CopyTo(certificates, 0);
+                collection.AddRange(certificates);
                 store.Close();
             }