public void TestToBytes3()
 {
     var privacy = new DESPrivacyProvider(new OctetString("privacyphrase"), new MD5AuthenticationProvider(new OctetString("authentication")));
     var trap = new TrapV2Message(
         VersionCode.V3,
         new Header(
             new Integer32(1004947569),
             new Integer32(0x10000),
             privacy.ToSecurityLevel()),
         new SecurityParameters(
             new OctetString(ByteTool.Convert("80001F8880E9630000D61FF449")),
             Integer32.Zero,
             Integer32.Zero,
             new OctetString("lextm"),
             new OctetString(ByteTool.Convert("61A9A486AF4A861BD5C0BB1F")), 
             new OctetString(ByteTool.Convert("0000000069D39B2A"))),
         new Scope(OctetString.Empty, OctetString.Empty,
                   new TrapV2Pdu(
                       234419641,
                       new ObjectIdentifier("1.3.6"),
                       0,
                       new List<Variable>())),
         privacy, 
         null);         
     byte[] bytes = trap.ToBytes();
     UserRegistry registry = new UserRegistry();
     registry.Add(new OctetString("lextm"), privacy);
     IList<ISnmpMessage> messages = MessageFactory.ParseMessages(bytes, registry);
     Assert.AreEqual(1, messages.Count);
     ISnmpMessage message = messages[0];
     Assert.AreEqual("80001F8880E9630000D61FF449", message.Parameters.EngineId.ToHexString());
     Assert.AreEqual(0, message.Parameters.EngineBoots.ToInt32());
     Assert.AreEqual(0, message.Parameters.EngineTime.ToInt32());
     Assert.AreEqual("lextm", message.Parameters.UserName.ToString());
     Assert.AreEqual("61A9A486AF4A861BD5C0BB1F", message.Parameters.AuthenticationParameters.ToHexString());
     Assert.AreEqual("0000000069D39B2A", message.Parameters.PrivacyParameters.ToHexString());
     Assert.AreEqual("", message.Scope.ContextEngineId.ToHexString()); // SNMP#NET returns string.Empty here.
     Assert.AreEqual("", message.Scope.ContextName.ToHexString());
     Assert.AreEqual(0, message.Scope.Pdu.Variables.Count);
     Assert.AreEqual(1004947569, message.MessageId());
     Assert.AreEqual(234419641, message.RequestId());
 }