Sending Mail through vb.net application

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VB

Hi all.I am trying to send mail through my vb.net application but I am getting error
"Failure sending mail."Can any1 please help me to solve this?Below is the code which I have written.
Thanx in advance..

Private Sub Send_Mail(ByVal SendTo As String, ByVal Subject As String, ByVal Body As String)
        Dim strFrom As String = "myemail@gmail.com"
        Dim strto As String = SendTo
        Dim strSubject As String = Subject
        Dim strbody As String = Body

        Dim smtp As SmtpClient = New SmtpClient()
        Dim msg As MailMessage = New MailMessage(strFrom, strto, strSubject, strbody)
        msg.IsBodyHtml = True
        smtp.Host = "localhost"
        smtp.Send(msg)
        MsgBox("Mail Sent.")
    End Sub