How to get interchange id in custom pipeline and in orchestration

Question

My scenario is that I want to create a unique id for a message which should be remain unique throughout  biztalk so that I can track it anywhere.
I got messageID context property of message in decoding pipeline component through IBaseMessage pInMsg.MessageID.ToString() and
got the same messageID   in orchestration through messageName(BTS.MessageID) in expression shape.
But when I am using a custom disassembler component , I am unable to get the same messageID in orchestration because disassembler stage create a new messageID.
Can I use interchangeID of message for this scenario ?
If yes,how can I get interchangeID in custom decoding component as well as in orchestration ?
Prakash

Answer 1

Hi Prakash,
Yes, I believe InterchangeID should work for you in this case.
Refer: 
http://geekswithblogs.net/chrishan/archive/2006/01/17/66161.aspx
http://felixmondelo.blogspot.in/2007/08/interchangeid-vs-messageid.html
How to access? 
1) In your custom pipeline component you can access it 
Guid interchangeID = Guid.Parse(pInMsg.Context.Read("InterchangeID","http://schemas.microsoft.com/BizTalk/2003/system-properties");
where pInMsg is your IBaseMessage.
2) In orchestration:
varGuid = System.Guid.Parse(Message_1(BTS.InterchangeID));
I hope his helps.
Rachit