<OperationContractAttribute(AsyncPattern=True, 
   Action="http://opcfoundation.org/UA/2008/02/Services.wsdl/CreateSession", 
   ReplyAction="http://opcfoundation.org/UA/2008/02/Services.wsdl/CreateSessionResponse")>
<FaultContractAttribute(Action="http://opcfoundation.org/UA/2008/02/Services.wsdl/CreateSessionFault", 
   Name="ServiceFault", 
   Namespace="http://opcfoundation.org/UA/2008/02/Types.xsd", 
   DetailType=Opc.Ua.ServiceFault, 
   ProtectionLevel=ProtectionLevel.None, 
   HasProtectionLevel=False)>
Function BeginCreateSession( _
   ByVal request As CreateSessionMessage, _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

[OperationContractAttribute(AsyncPattern=true, 
   Action="http://opcfoundation.org/UA/2008/02/Services.wsdl/CreateSession", 
   ReplyAction="http://opcfoundation.org/UA/2008/02/Services.wsdl/CreateSessionResponse")]
[FaultContractAttribute(Action="http://opcfoundation.org/UA/2008/02/Services.wsdl/CreateSessionFault", 
   Name="ServiceFault", 
   Namespace="http://opcfoundation.org/UA/2008/02/Types.xsd", 
   DetailType=Opc.Ua.ServiceFault, 
   ProtectionLevel=ProtectionLevel.None, 
   HasProtectionLevel=false)]
IAsyncResult BeginCreateSession( 
   CreateSessionMessage request,
   AsyncCallback callback,
   object asyncState
)