Serialization Exception Error Help

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VB

Hi All,

I am trying to pass a list to a method. The list is defined as
Private attachments As New List(Of System.Net.Mail.Attachment)...

The method declared in RemoteSMTP is
Public Function Send(ByVal mailTo As String, ByVal mailSubject As String, ByVal mailHTML As String, ByVal mailCC As String, ByVal mailBCC As String, ByVal attachments As List(Of System.Net.Mail.Attachment)) As String

...

End Function

Private Function SendEmail() As Boolean


        Dim success As Boolean = True
        Dim remEmail As New RemoteObjects.RemoteSMTP

        Try

remEmail .MailTo = "abc@gmail.com"
            remEmail .MailCC = ""
            remEmail .MailBCC = ""
            remEmail .MailSubject = Me.txtSubject.Text
            remEmail.Attachments = attachments
remEmail.Send()
End Try
Catch ex As Exception

            MsgBox("Exception caught trying to send: " & ex.Message)
            success = False
        Finally

remEmail =Nothing




But i get the error at remEmail.attachments = attachments "Type 'System.Net.Mail.Attachment' in Assembly 'System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' is not marked as serializable."



Where am i going wrong?Please help.