Unable to connect to the remote server

Hi There,
I am having an issue where, while trying to send an email, it returns this error. I am using these settings for the code, please let me know what else I could try.

This is the C# code that I got from DiscountASP.NET tech support.

Thanks
Jay

Code block:
SmtpClient smtpClient = new SmtpClient();
smtpClient.Host = "localhost";
smtpClient.UseDefaultCredentials = true;
MailMessage mailmessage = new MailMessage(email.FromAddress, email.ToAddress);
mailmessage.IsBodyHtml = email.IsHtmlBody;
mailmessage.Subject = email.Subject;
mailmessage.Body = email.MessageBody;
mailmessage.BodyEncoding = Encoding.Default;
mailmessage.Priority = MailPriority.High;

smtpClient.Send(mailmessage);




Exception Details:

{"Unable to connect to the remote server"}
[System.Net.WebException]: {"Unable to connect to the remote server"}
Data: {System.Collections.ListDictionaryInternal}
HelpLink: null
InnerException: {"No connection could be made because the target machine actively refused it 127.0.0.1:25"}
Message: "Unable to connect to the remote server"
Source: "System"
StackTrace: " at System.Net.ServicePoint.GetConnection(PooledStream PooledStream, Object owner, Boolean async, IPAddress& address, Socket& abortSocket, Socket& abortSocket6, Int32 timeout)\r\n at System.Net.PooledStream.Activate(Object owningObject, Boolean async, Int32 timeout, GeneralAsyncDelegate asyncCallback)\r\n at System.Net.PooledStream.Activate(Object owningObject, GeneralAsyncDelegate asyncCallback)\r\n at System.Net.ConnectionPool.GetConnection(Object owningObject, GeneralAsyncDelegate asyncCallback, Int32 creationTimeout)\r\n at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)\r\n at System.Net.Mail.SmtpClient.Send(MailMessage message)"
TargetSite: {System.Net.Sockets.Socket GetConnection(System.Net.PooledStream, System.Object, Boolean, System.Net.IPAddress ByRef, System.Net.Sockets.Socket ByRef, System.Net.Sockets.Socket ByRef, Int32)}
>

 

I should also mention this is a Silverlight based web application. For host I have tried smtp.gisassist.com as well as localhost.

Thanks
Jay

 

I need to resolve this issues as soon as possible, can somebody help me out here.

Thanks
Jay