asp.net vb - docx corrupotion on email receving - asp.net

Question

Im trying to send a Docx file via this form that I made, the email sends fine.
but the docx file gets back corrupted..
this is my backgroudn code:
'Add the namespace for the email-related classes
Imports System.Net.Mail
Partial Class SendAttachment
Inherits System.Web.UI.Page
Protected Sub SendEmail_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SendEmail.Click
'Make sure a file has been uploaded
If String.IsNullOrEmpty(AttachmentFile.FileName) OrElse AttachmentFile.PostedFile Is Nothing Then
Throw New ApplicationException("Egad, a file wasn't uploaded... you should probably use more graceful error handling than this, though...")
End If
' UPDATE THIS VALUE TO YOUR EMAIL ADDRESS
Const ToAddress As String = "pelleg#shakuff.co.il"
'(1) Create the MailMessage instance
Dim mm As New MailMessage(UsersEmail.Text, ToAddress)
'(2) Assign the MailMessage's properties
mm.Subject = "שלוחת קורות חיים"
mm.Body = Body.Text
mm.IsBodyHtml = False
'Attach the file
mm.Attachments.Add(New Attachment(AttachmentFile.PostedFile.InputStream, AttachmentFile.FileName))
'(3) Create the SmtpClient object
Dim smtp As New SmtpClient
'(4) Send the MailMessage (will use the Web.config settings)
smtp.Send(mm)
'Show the EmailSentForm Panel and hide the EmailForm Panel
EmailSentForm.Visible = True
EmailForm.Visible = False
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
'On the first page load, hide the EmailSentForm Panel
EmailSentForm.Visible = False
End If
End Sub
End Class
its the sendemail.aspx.vb file.
any suggestions?

Answer 1

totally off the top of my head, but try setting:
AttachmentFile.PostedFile.InputStream.Position = 0
before you call:
'Attach the file mm.Attachments.Add(New Attachment(AttachmentFile.PostedFile.InputStream, AttachmentFile.FileName))