Failure Sending Message in Asp.net 3.5

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VS2008

ASP.NET

Windows

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Hi All,

I am using VS2008, Asp.Net3.5, Win7.
How can set(configure) SMTP in Win7.
I am getting error (failure sending message) from smtpClient.Send(message).
I have doubt for smtp, i think i am not getting understand how to set smtp server.
so plz give me step by step idea for setting smtp server that's it work.

I am using this code below.

SmtpClient smtpClient = new SmtpClient();
        MailMessage message = new MailMessage();
        try
        {
            MailAddress fromAddress = new MailAddress("mukeshpanth@gmail.com", "mukesh"); //from@site.com //Nameofsendingperson
            message.From = fromAddress;//here you can set address
            message.To.Add("mukeshpanth@yahoo.com");//here you can add multiple to  //to@site.com
            message.Subject = "Feedback";//subject of email 
            message.CC.Add("mukeshpanth@gmail.com");//ccing the same email to other email address
            message.Bcc.Add(new MailAddress("mukesh061984@gmail.com"));//here you can add bcc address 
            message.IsBodyHtml = false;//To determine email body is html or not
            message.Body = @"Plain or HTML Text";
            smtpClient.Send(message);
        }
        catch (Exception ex)
        {
            //throw exception here you can write code to handle exception here
            //Failure sending mail
        }

And I am using this code in web.config file.
host="localhost" port="25" in web.config file inside system.net tag

<system.net>  
<mailsettings>  
<smtp deliverymethod="Network"> 
<network host="localhost" port="25" defaultcredentials="true" />     
</smtp>       
</mailsettings>
</system.net>

help will be greatly appricated .......
Thanks
mukesh