Home/ Questions/Q 8145395
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-06T13:39:00+00:00

The exact error I am getting in Visual Studio 2012 is: error BC30456: ‘Dispose’

  • 0

The exact error I am getting in Visual Studio 2012 is:

error BC30456: ‘Dispose’ is not a member of ‘System.Net.Mail.SmtpClient’.

    Dim SmtpServer As New SmtpClient()
    Dim mail As New MailMessage()
    SmtpServer.Port = 25
    SmtpServer.Host = MYHOST.com"
    mail = New MailMessage()
    mail.From = New MailAddress("MYADDRESS@DOMAIN.com")
    mail.To.Add("RECIPIENT@DOMAIN.com")
    mail.Subject = "Test Mail"
    mail.Body = "This is for testing SMTP mail"
    SmtpServer.Send(mail)
    SmtpServer.Dispose()

This should be an obvious error. You would think I was using .net framework 3.5 or lower as Dispose() was only added as a member to SmtpClient in .net 4.0. However, I am using 4.0!

In the website property pages it states 4.0. Is there somewhere else that I need to set as 4.0? Compiler settings somewhere maybe?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    As you’ve observed, you are indeed using the 3.5 version of the System.Net.Mail.SmtpClient.

    To ensure that you’re using version 4:

    • navigate to your project’s references director in Visual Studio
    • delete the reference to System.Net
    • right click, Add Reference
    • find the assembly in the list, as below

    enter image description here

    enter image description here

    Also, consider refactoring your code to have a Using block.

    Using smtp As New SmtpClient()    
   smtp.Port = 25
   'etc etc
End Using
    • 0