System.Net.Mail.MailMessage is type not a namespace

Hi guys,

 
I�´m trying to use the namespace System.Net.Mail.MailMessage but the following error appears:
   A using namespace directive can only be applied to namespaces; 'System.Net.Mail.MailMessage' is a type not a namespace   
 
I�´m using Visual WebDevelopper 2008 with .NET 3.5
 
Thanks four your reply.
 
Best Regards,
 
Rui Figueiredo 
 
 
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