How do I send an auto-email by clicking on button ?

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VS2013

mail

Hi, im doing a registration form, and i ask the user to type his/her email, so after clicking on the button "register" it will send an email to the user. what i have is this :

Dim smtpServer As New SmtpClient
        Dim mail As New MailMessage()
        smtpServer.Credentials = New Net.NetworkCredential("myemail@gmail.c­om", "pass")
        smtpServer.Port = 587
        smtpServer.Host = "smtp.gmail.com"
        smtpServer.EnableSsl = True
        mail = New MailMessage()
        mail.From = New MailAddress("myemail@gmail.com")
        mail.To.Add("users-email@gmail.com")
        mail.Subject = " Welcome"
        mail.Body = "hi"
        smtpServer.Send(mail)