Sometimes, a developer may need to access their Session's ID on the script side, for example to use it as an output to a table via a custom export.

There are two possible Session IDs. When a new form is created, a local client session ID is created. This a unique ID that will live with the life of the form. You can get to this ID through the SessionData Class. A possible solution considering your end goal would be through a AfterDataPathsRun event, possibly:

<MiCode(FormScriptEventType.AfterDataPathsRun)> _ 
Public Sub Form_AfterDataPathsRun(ByVal e As AfterDataPathsRunEventArgs) 

	Dim localID As String 
	If _form.SessionData.Count > 0 Then 
		Dim sd As SessionData = CType(_form.SessionData(0), SessionData) 
		localID = sd.SessionID
	End If 
End Sub 

A server-side session ID, ServerSesssionID, is also created when the form is sent to the server. If you need this, you could create a hidden field and then set that field via the ServerQueuing event that is triggered as the form is sent to the server. This is not a permanent ID, as it does change every time it syncs with the server. A possible solution would be:

<MiCode(FormScriptEventType.ServerQueuing)> _ Public Sub Form_ServerQueuing(ByVal e As ServerQueuingEventArgs)
	_Hidden.Value = e.ServerSessionID 
End Sub 

<MiCode(FormScriptEventType.ServerQueuing)> _ Public Sub Form_ServerQueuing(ByVal e As ServerQueuingEventArgs) 
 	_Hidden.Value = e.ServerSessionID 
End Sub 

<MiCode(FormScriptEventType.AfterDataPathsRun)> _ Public Sub Form_AfterDataPathsRun(ByVal e As AfterDataPathsRunEventArgs) 
 	Dim localID As String 
	Dim serverID As String 

 	If _form.SessionData.Count > 0 Then 
 		Dim sd As SessionData = CType(_form.SessionData(0), SessionData) 
		localID = sd.SessionID
	End If 

	serverID = _Hidden.Value 
End Sub