Question : C# Outlook Late Binding add Attachment

How do I add an attachment to e-mail using assembly reflection in C#?
In other words, how do I translate:
Microsoft.Office.Interop.Outlook.Attachment oAttach = oMsg.Attachments.Add(sSource,1, 1, "");?
The following code throws error on the attachments step.
Everything else works.
           oApp = Activator.CreateInstance(outlook);
            object mailItem = oApp.GetType().InvokeMember("CreateItem", BindingFlags.InvokeMethod, null, oApp, new object[] { 0 });
            mailItem.GetType().InvokeMember("Subject", BindingFlags.SetProperty, null,mailItem, new string[] {"Report"});
            Object attachments = mailItem.GetType().GetProperty("Attachment",BindingFlags.GetProperty);
            attachments.GetType().InvokeMember("Add", BindingFlags.InvokeMethod, null, attachments, new object[] { att,1,1,"CrystalReport1.rpt.pdf" });
            mailItem.GetType().InvokeMember("Display", BindingFlags.InvokeMethod, null, mailItem, new object[] { true });

Answer : C# Outlook Late Binding add Attachment

The only info I find only tells me that person, and calculated columns can not be the soruce of a lookup, I cannot seem to find the page on MSDN that has this info, and tell what all columns won't work.  Its been my experience that the lookup is very picky on what it will display.

but this might help you: http://filteredlookup.codeplex.com/