Reply twice from outlook add in itemadd event - office-interop

Question

I need to reply twice from an Outlook Add-in item_Add event, once as soon as the mail arrives and once more after some processing. The code for the registered callback looks somewhat as below:
void items_ItemAdd(object Item)
{
Outlook.MailItem mail = (Outlook.MailItem)Item;
Outlook.MailItem reply = mail.Reply();
// Add some stuff to reply body and subject
reply.Send();
Marshal.ReleaseComObject(reply);
// Some processing for few seconds
reply = mail.Reply();
// Update reply body and subject
reply.Send()
// Release reply object
}
The problem I have is the 2 replies are sent out at the end after processing is complete. Is there a way to send the first reply immediately and not wait till the end?

Answer 1

Note, you run the code from the event handler. The handler should return the control flow to Outlook to process your replies.
You can try to use SyncObjects property of the Namespace class to force the synchronization.
Public Sub Sync()
Dim nsp As Outlook.NameSpace
Dim sycs As Outlook.SyncObjects
Dim syc As Outlook.SyncObject
Dim i As Integer
Dim strPrompt As Integer
Set nsp = Application.GetNamespace("MAPI")
Set sycs = nsp.SyncObjects
For i = 1 To sycs.Count
Set syc = sycs.Item(i)
strPrompt = MsgBox("Do you wish to synchronize " & syc.Name &"?", vbYesNo)
If strPrompt = vbYes Then
syc.Start
End If
Next
End Sub

Answer 2

I had modify the code as below:
...
outlookNameSpace = this.Application.GetNamespace("MAPI");
...
void items_ItemAdd(object Item)
{
Outlook.MailItem mail = (Outlook.MailItem)Item;
Outlook.MailItem reply = mail.Reply();
// Add some stuff to reply body and subject
reply.Send();
outlookNameSpace.Session.SendAndReceive(false);
Marshal.ReleaseComObject(reply);
// Some processing for few seconds
reply = mail.Reply();
// Update reply body and subject
reply.Send()
// Release reply object
}
Thanks