c# - How to reply to an Outlook mailitem using .net -

i writing outlook 2007 add-in composes business quote in response email query. compose quote using windows forms. works fine until point of replying original message quote information.

private void btnsend_click(object sender, eventargs e)  {     outlook.mailitem themail = ((outlook._mailitem)quote.mailitem).reply();     themail.subject = "this quote";     themail.body = <some html composed elsewhere>;      outlook.recipient rcp = themail.recipients.add("joe blow");     outlook.addressentry ae = rcp.addressentry;     ae.address = "joe@blow.com"; } 

where quote.mailitem incoming email request. when run code, throws exception executing rcp.addressentry. error

'an object cannot found'

. need able add , delete addressees setting cc , bcc fields on quote before send out. addressees may not in address book. have done other mail libraries , should simple, seem barking wrong tree outlook.

edit found - dmitry pointing me in right direction.

outlook.recipient rcp = themail.recipients.add("joe blow <joe@blow.com>"); rcp.type = (int)outlook.olmailrecipienttype.olto; 

the recipient must resolved first . , cannot set addressentry.address property - if settable, not point message recipients table.

outlook.recipient rcp = themail.recipients.add("joe blow <joe@blow.com>"); rcp.resolve();