Hi
thank all of you. I have solved Below is code
Private Sub SendHtmlFormattedEmail(ByVal recepientEmail As String, ByVal subject As String, ByVal body As String)
'After config mailSettings section in web.config, you don't need to initialization client's property
Dim client As New SmtpClient()
Dim message As New MailMessage()
message.Body = body
message.To.Add(recepientEmail)
message.Subject = subject
message.IsBodyHtml = True
client.Send(message)
End Sub