[VB.NET] สอบถามการส่งอีเมล์ พอรันแล้วแล้วหน้าจอแจ้งว่า "The "SendUsing" configuration value is invalid."

    Sub Page_Load(sender As Object, e As EventArgs)				
        Dim myMail As New MailMessage()

		myMail.To = "[email protected]"
		myMail.From = "[email protected]"
		myMail.Subject = "My Subject"

		myMail.BodyFormat = MailFormat.Text
		myMail.Body = "My Body & Description"
		
		SmtpMail.SmtpServer = "192.168.0.1"  '*** Mail Server ***'
		SmtpMail.Send(myMail)

		myMail = Nothing

		Me.lblText.Text = "Mail Sending."
	End Sub