Hi everybody,
When i try to execute the last example(Sending EMail to Admin)in chapter 17,an error raises and announces:
System.Runtime.InteropServices.COMException: The "SendUsing" configuration value is invalid
Here is the code:

<%@ Import Namespace="System.Web.Mail" %>
<%@ Page Debug="True" %>
<script language="VB" runat="server" >
 Sub SendMailTest()
 dim intCounter as integer
 intCounter =1
 for intCounter=1 to 10
  intCounter = intCounter+1
 next
 response.write ("The value of the counter is:" & intCounter & "<br>")
 intCounter = "Storing a string to an integer"
 End sub

 Sub Page_Error(sender As Object, exc As EventArgs)
 dim errorMessage as string
 errorMessage = "Error occurred" & Server.GetLastError().ToString()
 Server.ClearError()
 Dim newMail As New MailMessage
 newMail.From = "pearlanaz@yahoo.com"
 newMail.To = "nasrinz@hotmail.com"
 newMail.Subject = "Error Occurred."
 newMail.Body = errorMessage
 SmtpMail.Send(newMail)
 End Sub
</script>
<%
 SendMailTest()
%>
Could anybody help me?
Thanks!!