Kod na wysylanie emaila

Imports System.Net.Mail
Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim MyMailMessage As New MailMessage()
        Try
            MyMailMessage.From = New MailAddress("email")
            MyMailMessage.To.Add("email")
            MyMailMessage.Subject = TextBox1.Text
            MyMailMessage.Body = TextBox2.Text
            Dim SMTP As New SmtpClient("smtp.gmail.com")
            SMTP.Port = 587
            SMTP.EnableSsl = True
            SMTP.Credentials = New System.Net.NetworkCredential("email", "haslo")
            SMTP.Send(MyMailMessage)
            TextBox2.Text = ""
        Catch ex As Exception
        End Try
    End Sub
End Class

Gdy odpalam program w VB 2k10 program nie wysylami textboxow na emaila ? Przyczyna ?