Creating Url service alert using windows service in C#

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Hi All

Pardon me for being so naive.I have a task to check the status of a group of Urls (whether active or inactive) and return the status to the log file every 3-4 minutes. Following is the code that I used:

C#

void cacheTimer_Elapsed(object sender, ElapsedEventArgs e)
        {
            serviceTimer.Enabled = false;
            try
            {
                string[] lstOfUrls = new string[] { "http://www.policybazaar.com", "http://www.comparebima.com", "http://www.accuratequotes.in" };


                foreach (string s in lstOfUrls)
                {
                    try
                    {
                        WebRequest request = HttpWebRequest.Create(s);

                        request.Timeout = 10000;
                        request.Method = "HEAD";
                        HttpWebResponse resp = request.GetResponse() as HttpWebResponse;

                        response.StatusCode == HttpStatusCode.OK


                        if (statusCode >= 100 && statusCode < 400) //Good requests
                        {
                            Library.WriteErrorLog("Url {0} is working: ",s);

                        }
                        else if (statusCode >= 500 && statusCode <= 510) //Server Errors
                        {
                            Library.WriteErrorLog("The remote server has thrown an internal         error. Following Url is not valid: {0}", s);

                        }

                    }
                 
                    catch (Exception ex)
                    {
                        {
                            Library.WriteErrorLog("Could not test url {0}.", s);
                        }
                    }


                }
            }
            catch (Exception ex)
            {
                string str=ex.Message;
               
            }
            finally
            {
                serviceTimer.Enabled = true;
            }

        }
        
        protected override void OnStop()
        {
            serviceTimer = null;
        }

  



    }

        }

This ,obviously is not working for me,It is giving some other exception at all times in the log file:
"28-02-2014 13:47:34:System;The remote server returned an error: (500) Internal Server Error."
while the links are working.

I used status codes,let me know if it could have been done in an easier way.

Also,someone suggested I remove if blocks from the program and replace them with a single condition(response.StatusCode == HttpStatusCode.OK) which I did and use URI instead of array of URLs .Dont know how that is going to be done .Please share your views on that and ,if possible,kindly share a code snippet for my requirement.I have to do this using windows service and generate a log of website status by hitting the URLs every 5 minutes and logging the activity every 5 minutes.

For e.g. : "policybazaar.com is down at the moment,comparebima.com is Up,accuratequotes.in is down"

Thanks
Sumit

Posted 3-Mar-14 0:15am

sumit.dhawan

Updated 3-Mar-14 0:18am

dan!sh

v2

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*dan!sh* · Answer 1 · 2014-03-03T00:23:00

Try this code:

C#

List<string> urls = new List<string>();
            urls.Add("Add_URL_here");

            urls.ForEach(x => {
                WebRequest request = WebRequest.Create(x);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();

                if (response == null || response.StatusCode != HttpStatusCode.OK) { 
                // Log that website is down
                }

                response.Close();
            });</string></string>

sumit.dhawan · Answer 2 · 2014-03-03T02:39:00

Thanks for replying D@nish,

Now ,I am using the following code:

void cacheTimer_Elapsed(object sender, ElapsedEventArgs e)
{
serviceTimer.Enabled = false;

List<string> lstOfUrls = new List<string>();
lstOfUrls.Add("http://www.policybazaar.com");
lstOfUrls.Add("http://www.comparebima.com");
lstOfUrls.Add("http://www.accuratequotes.in");

lstOfUrls.ForEach((s)=>
{
WebRequest request = WebRequest.Create(s);
EventLog.WriteEntry("NotifyWService", "Web request sent " + DateTime.Now);
//request.Timeout = 30000;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
EventLog.WriteEntry("NotifyWService", "Web response acquired " + DateTime.Now);

if (response == null || response.StatusCode != HttpStatusCode.OK)
{
EventLog.WriteEntry("NotifyWService", "if block for inactive status " + DateTime.Now);
lib.StatusInactive(s);
EventLog.WriteEntry("NotifyWService", "writing inactive status after calling the StatusInactive() method " + DateTime.Now);
}

else
{
EventLog.WriteEntry("NotifyWService", "else block because site is working " + DateTime.Now);
lib.StatusActive(s);
EventLog.WriteEntry("NotifyWService", "writing active status after calling the StatusActive() method " + DateTime.Now);
}
EventLog.WriteEntry("NotifyWService", "Out of if else block " + DateTime.Now);
response.Close();
EventLog.WriteEntry("NotifyWService", "response has been closed" + DateTime.Now);
});

}

Now the issue is that on checking the Eventlog ,the control is not going beyond the web request and it is not able to get the response.On checking the eventlog , the last step where the control reaches is :
EventLog.WriteEntry("NotifyWService", "Web request sent " + DateTime.Now);

Any idea what am I doing wrong because the control is not going any further then the request.

Creating Url service alert using windows service in C#

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