ASP.NET/VB - Email multiple addresses

This code sends a single email to "email1@example.com".  How can I send an email to three addresses:
email1@example.com
email2@example.com
email3@example.com

Imports System.Net.Mail
Imports System.IO
Imports System.Threading
Imports System.Text.RegularExpressions

Partial Class contact_submit
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        Dim EmailBody As StringBuilder = New StringBuilder

        Dim message As MailMessage = New MailMessage(ConfigurationManager.AppSettings("ContactEmailFrom").ToString(), "email1@example.com")

            EmailBody.Append("Name: " + Request.Params("Full_Name") + Environment.NewLine + Environment.NewLine)
            message.IsBodyHtml = False
            message.Body = EmailBody.ToString()
            message.From = New System.Net.Mail.MailAddress(ConfigurationManager.AppSettings("ContactEmailFrom").ToString())
            message.Subject = "Sales Inquiry"
            message.ReplyTo = New MailAddress(Request.Params("Email_Address"))

            Dim SmtpMail As New SmtpClient
            Dim basicAuthenticationInfo As New System.Net.NetworkCredential(ConfigurationManager.AppSettings("SMTPUser").ToString(), ConfigurationManager.AppSettings("SMTPPassword").ToString())

            SmtpMail.Host = ConfigurationManager.AppSettings("SMTPServer").ToString()
            SmtpMail.UseDefaultCredentials = False
            SmtpMail.Credentials = basicAuthenticationInfo
            SmtpMail.Send(message)
      
    End Sub
End Class

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