System.Net.Mail .SmtpClient Send sends when it wants to

[SR]

I am using the new namespace in .NET 2.0 to connect to an SMTP server and
send an email message. I am using a Windows Application environment. When
I call the Send function, the message is not sent immediately. It is only
sent when I close the application or try to send another message. I have
tried disabling my AntiVirus package and it still happens or should I say,
doesn't happen. The following is my code, quite simple and from my prior
research, correct.

TIA - Seth

Dim oClient As SmtpClient
Dim oMsg As MailMessage
Dim oFrom As MailAddress

Try
oClient = New SmtpClient("smt p.myserver.com" )
oClient.Deliver yMethod = SmtpDeliveryMet hod.Network
oClient.UseDefa ultCredentials = False
oClient.Credent ials = New
System.Net.Netw orkCredential(" us******@myserv er.net", "myPassword ")
oMsg = New MailMessage
oFrom = New MailAddress("us ******@myserver .net", "User Name")

oMsg.From = oFrom
oMsg.To.Add("to ****@hotmail.co m")
oMsg.Subject = "Test"
oMsg.Body = "Test"
oClient.Send(oM sg)
Catch ex As Exception
MsgBox(ex.Messa ge)
Finally
If Not oMsg Is Nothing Then
oMsg.Dispose()
End If
oClient = Nothing
GC.GetTotalMemo ry(True)
End Try