SendGrid SMTP Send Mail Message .Net

            Dim recipients As New List(Of [String])() From {Emailx + ""}
            Dim customArgs As New Dictionary(Of String, String)()
            customArgs.Add("campaign_id", "ewCID9999")
            customArgs.Add("Customer_ID", "ewCUSID123")

            Dim myMessage = New SendGridMessage()
            myMessage.AddTo(recipients)
            myMessage.From = New MailAddress(fromAddress) 'fromAddress
            Dim tReply = New MailAddress("myaddress@mydomain.com")

            myMessage.Subject = "TEST NEW USER"
            myMessage.Html = "TEST HTML <br /><br /><br />LB"
            myMessage.AddUniqueArgs(customArgs)
            myMessage.ReplyTo = tReply
            Dim credentials = New NetworkCredential(sgUsername, sgPassword)
            ' Create a Web transport for sending email.
            Dim transportWeb = New Web(credentials)