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I have used the following code in an itemAdded event receiver.

        public override void ItemAdded(SPItemEventProperties properties)
        {
            if (properties.ListTitle == "Architecture Calendar")
            {

                base.ItemAdded(properties);
                string eventUrl = null;
                string AttachUrl=null;

                using (SPSite site = properties.OpenSite())
                {
                    using (SPWeb web = site.OpenWeb())
                    {
                        try
                        {
                            SPList listCalendar = web.Lists[properties.ListId];
                            SPItem itemCalendar = properties.ListItem;
                            SPSite mainSite = new SPSite(site.Url + @"/admin/");
                            SPWeb mainWeb = mainSite.OpenWeb();
                            
                            **AttachUrl = properties.ListItem.Attachments.UrlPrefix + properties.ListItem.Attachments[0];**

                            SPList listIntegrated = mainWeb.Lists["IntegratedEvents"];
                            SPListItem itemIntegrated = listIntegrated.Items.Add();

                            **itemIntegrated["Picture"] = AttachUrl;**
                           
                            

                            itemIntegrated.Update();
                            

                        }
                        catch (Exception Ex)
                        {
                            throw Ex;
                        }
                    }
                }
            }