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("smtp.myserver.com")
oClient.DeliveryMethod = SmtpDeliveryMethod.Network
oClient.UseDefaultCredentials = False
oClient.Credentials = New
System.Net.NetworkCredential("us******@myserver.ne t", "myPassword")
oMsg = New MailMessage
oFrom = New MailAddress("us******@myserver.net", "User Name")

oMsg.From = oFrom
oMsg.To.Add("to****@hotmail.com")
oMsg.Subject = "Test"
oMsg.Body = "Test"
oClient.Send(oMsg)
Catch ex As Exception
MsgBox(ex.Message)
Finally
If Not oMsg Is Nothing Then
oMsg.Dispose()
End If
oClient = Nothing
GC.GetTotalMemory(True)
End Try