send the mail through exchange server in .net window application having the OS Vista as below..

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C#

hi guys i m trying to send the mail through exchange server in .net window application having the OS Vista as below..

MailMessage completeMessage = new MailMessage("mailroom@ericsson.com","rajendra.koranga@gmail.com", "test", "sdfsfs");
create smtp client at mail server location
SmtpClient client = new SmtpClient("localhost");
add credentials
client.UseDefaultCredentials = true;
try
{
send message
client.Send(completeMessage);
}
catch (Exception)
{
throw;//failer sending mail
}
i am getting the error as failer sending mail at throw...

can someone help me please..


thanks