Asp.net code for sending email

[vinlam]

This is my code. But there are 3 errors in it.
1st Error: Dim message As New MailMessage()
2nd Error: SmtpMail.SmtpServer = mailServer
3rd Error: SmtpMail.Send(message)

Can someone teach me how to configure and correct the code?

Imports System.Web.Mail

Partial Class ReferaFriend
Inherits System.Web.UI.Page

Protected Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmdSubmit.Click

Dim webMasterEmail As String = "[e-mail]"
Dim emailSubject As String = "ASP.NET Secrets Email from website at " + DateTime.Now.ToString()
Dim mailServer As String = "[e-mail]"

'email code found below
Dim message As New MailMessage()

message.From = webMasterEmail
message.To = webMasterEmail
message.Subject = emailSubject
message.Body = "Email sent from" + txtEmailAddress.Text
message.Body += vbCrLf + txtMessage.Text
SmtpMail.SmtpServer = mailServer

SmtpMail.Send(message)
Response.Write("Message Sent!")
End Sub
End Class