How to get the HostName, Ip of the machine hosting the asp.net application

How can i get the LocalhostName, Ip of the machine hosting the Application. For development it would be localhost for deployment something different. This i need to initialize the SmtpClient to send emails through application

SmtpClient emailClient = new SmtpClient("host","port");//port is optional

i am looking for a permanent solution, no workarounds and no sniffing from response, request and this could be spoofed[hope i am not开发者_Go百科 crazy because no one can spoof the servers data in headers can they?]

If you want to configure SmtpClient class, you should have a look at the system.net > mailsettings entry of the web.config : http://msdn.microsoft.com/en-us/library/w355a94k.aspx

<configuration>
    <system.net>
        <mailSettings>
            <smtp deliveryMethod="network">
                <network
                    host="localhost"
                    port="25"
                    defaultCredentials="true"
                />
            </smtp>
        </mailSettings>
    </system.net>
</configuration>

And instanciate the StmpClient with parameterless constructor

var client = new SmtpClient();

if you use

    IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());

and

public static bool IsLocalIpAddress(string host)
{
  try
  { // get host IP addresses
    IPAddress[] hostIPs = Dns.GetHostAddresses(host);
    // get local IP addresses
    IPAddress[] localIPs = Dns.GetHostAddresses(Dns.GetHostName());

    // test if any host IP equals to any local IP or to localhost
    foreach (IPAddress hostIP in hostIPs)
    {
      // is localhost
      if (IPAddress.IsLoopback(hostIP)) return true;
      // is local address
      foreach (IPAddress localIP in localIPs)
      {
        if (hostIP.Equals(localIP)) return true;
      }
    }
  }
  catch { }
  return false;
}

it should return something like

IsLocalIpAddress("localhost");        // true (loopback name)
IsLocalIpAddress("127.0.0.1");        // true (loopback IP)
IsLocalIpAddress("MyNotebook");       // true (my computer name)
IsLocalIpAddress("192.168.0.1");      // true (my IP)
IsLocalIpAddress("NonExistingName");  // false (non existing computer name)
IsLocalIpAddress("99.0.0.1");         // false (non existing IP in my net)

this can be simply modified to return the address you need