C#: Internet & Networking

person Jason Huangfolder_openC#, Codelocal_offer, , , , , , access_time October 6, 2009

The following short pieces of code show you how to:
– Ping an IP address
– Send an email in .NET with authenticated user (not anonymous email host)
– How to do a simple HTTP request using .NET

Ping IP

//requires .NET framework 2.0
        public static string PingIP(string commandStr)
            string output = "";
            System.Net.NetworkInformation.Ping myPing = new System.Net.NetworkInformation.Ping();
            System.Net.NetworkInformation.PingReply myReply = myPing.Send(commandStr);
            output = "Ping [" + commandStr + "] returns status " +  myReply.Status.ToString() + ": ";
            if (myReply.Status == System.Net.NetworkInformation.IPStatus.Success)
                output += "Address: " + myReply.Address.ToString() + "\t";
                output += "RTT: " + myReply.RoundtripTime.ToString() + "\t";
                output += "TTL: " + myReply.Options.Ttl.ToString() + "\t";
            return output;

Send Email using Authenticated SMTP Server

/*The following code uses .NET 2.0 framework, and it could use SMTP server that requires SSL & user/password authentifcation, such as the gmail server.
Point to remember: when using secured SMTP server, need to set UseDefaultCredential to false, otherwise it will not use the new NetworkCredential you set; Also have to make .EnableSsl = true if the server requires it.
using System.Net.Mail;
        private void test()
            System.Collections.Hashtable ht = new System.Collections.Hashtable();
            ht["To"] = "to_somebody@mail.com";
            ht["From"] = "from_somebody@mail.com";
            ht["Subject"] = "Subject of the email here";
            ht["Body"] = "body of test email message.";
            ht["smtp"] = "smtp.mail.com";  //whatever your smtp server host name is
            ht["User"] = "user_mail@mail.com"; //what your user name is for login to secured SMTP mail server
            ht["Password"] = "somepassword"; //password for login to SMTP mail server.
        //this is a helper function that actually sends the email
        public static void SendEmail(System.Collections.Hashtable ht)
            MailMessage msg = new MailMessage();
            msg.From = new MailAddress(ht["From"].ToString());
            msg.Subject = ht["Subject"].ToString();
            msg.Body = ht["Body"].ToString();
            msg.Priority = MailPriority.Normal;
            //That is where the SMTP server authentication takes place
            SmtpClient smp = new SmtpClient(ht["smtp"].ToString());
            smp.UseDefaultCredentials = false;
            //use SSL to login
            smp.EnableSsl = true;
            //pass the user name and password to credential
            System.Net.NetworkCredential smtpCredential =
				new System.Net.NetworkCredential(ht["User"].ToString(), ht["Password"].ToString());
            smp.Credentials = smtpCredential;

Simple HTTP Request

//This example code simply takes www.microsoft.com and print out its http response and header info
using System.Net;
using System.IO;
        static void Main(string[] args)
            string URL = "http://www.microsoft.com";
                //System.Net.WebProxy wp = new WebProxy("http://mcd-server/mcd/proxy.pac");
                Uri uriObj = new Uri(URL);
                HttpWebRequest request = (System.Net.HttpWebRequest) WebRequest.CreateDefault(uriObj);
                //request.Proxy = wp;
                System.Net.WebResponse myResp = request.GetResponse();
                Stream s = myResp.GetResponseStream();
                StreamReader reader = new StreamReader(s, System.Text.Encoding.ASCII);
                String respHTML = reader.ReadToEnd();
                for (int i = 0; i < myResp.Headers.Count; i++)
            catch(WebException exp)


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