VB6.0 to C# com interop problem

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C#

Hi,

I am stuck with a piece of code. Could you please help me out with the query.

I have a VB6.0 built com component which passes a collection type object to a c# dll. This collection VB6.0 is a collection of strings (paths as string for mail attachments).

VB6.0 call :

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Dim attachmentPath1 As String
    Dim attachmentPath2 As String
    attachmentPath1 = "C:\SMTPAttachmentsTest\TestAttachment1.txt"
    attachmentPath2 = "C:\SMTPAttachmentsTest\TestAttachment2.txt"
    attachmentColl.Add (attachmentPath1)
    attachmentColl.Add (attachmentPath2)
    
    'Call to c# dll
    MailHelperSMTPObject.SendMailMessageWOAttachment from.Text, recipient.Text,   recipient.Text, subject.Text, message.Text, attachmentColl 
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

The c# code is supposed to catch the attachmentColl collection and read all the string paths in that collection.
C# Code :

/////////////////////////////////////////////////////////////////////////////////
public void SendMailMessageWOAttachment(string from, string to, string cc, string subject, string body, object  AttachmentPaths)
        {
            string SMTPSrv;
            Int32 SMTPPort;
            MailMessage mMailMessage = new MailMessage();
            mMailMessage.From = new MailAddress(from);
            mMailMessage.To.Add(new MailAddress(to));
            mMailMessage.CC.Add(new MailAddress(cc));
            mMailMessage.Subject = subject;
            mMailMessage.Body = body;
            SmtpClient mSmtpClient = new SmtpClient(SMTPSrv);
            mSmtpClient.Host = SMTPSrv;
            mSmtpClient.Port = SMTPPort;

            Attachment attach1;

            foreach (object i in AttachmentPaths)
            {
                attach1 = new Attachment(i.ToString());
                mMailMessage.Attachments.Add(attach1);
            }

            mSmtpClient.Send(mMailMessage);
        }
/////////////////////////////////////////////////////////////////////////////////

The problem is that, I cannot change the VB code. I can change only c# code to catch the VB call. I have tried numerous combinations to catch the collection object from VB6.0 but unable to do so. The code works perfect when I remove the attachment collection object from VB6.0 code. But it give a a runtime error of Automation and interface or invalid argument or parameter call. I am using a callable wrapper.

Please help.