Storing separate data and group on common key

Working with an API that can handle multiple connections (i.e. sessions), each of these sessions has a uniqueID (sessionID) and keeps track of all inbound and outbound messages via sequence numbers.

Class1

public void Method1(SessionID sessionID, Message message)
{       
    var ID = sessionID;
    var foo = message.InSeqNo;
}

public void Method2(SessionID sessionID, Message message)
{
    var ID = SessionID;
    var bar = message.OutSeqNo;
}

I'm curious how would you recommend storing this data together so each instance can be displayed independently based on its sessionID.

There is no need to store previous numbers because th开发者_开发技巧ey are only displayed. None of the SessionIDs will change and each sequence number will update independently.

The best thing I can think of is using two separate fields like Dictionary<sessionID, number>, .Clear each field on update, re-add with new values, then join the two via LINQ and display the information.

Why not a single class that contains the inbound and outbound sequence numbers for a particular ID?

class SessionInfo
{
    public int SessionId { get; private set; }
    public int InSeqNo { get; set; }
    public int OutSeqNo { get; set; }
}

Dictionary Sessions = new Dictionary();

To update a session's InSeqNo, then:

SessionInfo sess;
if (Sessions.TryGetValue(sessionId, out sess))
{
    ++sess.InSeqNo;
}

Or am I missing something fundamental in your question?