asp.net - Get Last Sever Error without using Global.asax page -

I have set a custom error on my server and I am redirecting to a page as shown below

  & lt; CustomErrors mode = "current" & gt; & Lt; Error status code = "500" redirect = "/ seperate / default.aspx" /> & Lt; / CustomErrors & gt;  

When that page goes to Preventive / Default.aspx , I need to send an e-mail with the exception . Message

Here is what I am trying to do, but it will not work

  sub page_load (as the only sender in the form of the object, -Ool) Dim ErrMessage as an exception to Dim Last Aher LastError = Server.GetLastError () ErrMessage = LastError.Message Dim Errormail = New MailMessage 'Send Email to IromMail. For = "email@email.co.uk" Errormail.From = "servicererror@email.co.uk" Errormail.Subject = "Server Error Alert" Errormail.BodyFormat = MailFormat.Text Errormail.Priority = MailPriority.Normal Errormail Body = ErrMessage SmtpMail.Smtp Server = "Localhost" SmtpMail.Send Server.ClearError () End Sub  
 Jamie   
 
 
 
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 see here:  
 You must add redirect media:  
  & lt; CustomErrors mode = "on" redirectMode = "ResponseRewrite">  & lt; / customErrors & gt;