Send e-mail the body of the letter taken from the word file

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VB

Good day. I need to send a letter to the e-mail. But the body of the letter is taken from a Word file (.doc or .docx)
I know how to perform a simple letter sending.

What I have tried:

Imports System.Net.Mail
Imports System.Text
 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button2.Click
        Dim email As New MailMessage
        Dim smtp As SmtpClient
        smtp = New SmtpClient("smtp.yandex.ru")
        smtp.Port = 587
        smtp.Credentials = New Net.NetworkCredential("admin@yandex.ru", "")
        email.From = New MailAddress("admin@yandex.ru")
        email.To.Add(New MailAddress("SEVlasova@yandex.ru"))
        email.Body = "Post" ' body of the letter take the text (data from MS Word (doc or docx)
        email.Subject = "Post"
        email.Attachments.Add(New System.Net.Mail.Attachment("D:\files.txt"))
        smtp.Send(email)
     End Sub<pre>