How to send images in Mail vb.net?

Create Mail message object
Build HTML string for images
Add HTML string in AlternateView
Add images as LinkedResources in AlternateView
Add AlternateView to Mail message.

Below code will demonstrate the steps:

 
 Dim fileNames As String() = System.IO.Directory.GetFiles("C:\imageFolder\", "*.png")  
 Dim mailMsg As MailMessage = New MailMessage()  
 Dim imageHTML as String = String.Empty  
 Dim htmlView As AlternateView
   
 For i As Int16 = 0 To fileNames.Count - 1  
      imageHTML = imageHTML & "<table style=""padding:0px;margin:0px;border:2 solid black;""><tr><td valign=""top"" align=""left""><img width=720 height=930 src=cid:" & System.IO.Path.GetFileName(fileNames(i)) & "></td></tr></table>"  
 Next  

 htmlView = AlternateView.CreateAlternateViewFromString(imageHTML, Nothing, "text/html")
  
 For i As Int16 = 0 To fileNames.Count - 1  
      ' Linked source take physical image path to embed image.  
      Dim imagelink As LinkedResource = New LinkedResource(fileNames(i))  
      imagelink.ContentId = System.IO.Path.GetFileName(fileNames(i)) 'imgFile.Name  
      imagelink.TransferEncoding = System.Net.Mime.TransferEncoding.Base64  
      htmlView.LinkedResources.Add(imagelink)  
 Next  

 mailMsg.AlternateViews.Add(htmlView)  

Happy Coding!