C# XmlTextReader gets: The thread XXXX has exited with code 259 (0x103).

Posted on 2014-11-07
Medium Priority
Last Modified: 2014-11-21
Hi Experts,

I'm trying to learn ASP.net/C# and have run into an issue I'm not able to solve myself.

I'm trying to seed a list of Postal Codes into my own DB from a publicly available XML file - but when I try to run the seed, it is incredibly slow - and I randomly receive an "The thread XXXX has exited with code 259 (0x103)."

I've added some Debug statements to test if the data received is valid, and it is actually adding the data to my local DB.

What might be causing this performance issue? And what might be a better solution? (see code below)

Best regards

My code so far:
        public ActionResult Seed()
            ApplicationDbContext db = new ApplicationDbContext();

            var postalCodes = new List<PostalCode>();

            String URLString = "http://geo.oiorest.dk/postnumre.xml";

            XmlTextReader reader = new XmlTextReader(URLString);

            int fra = 0;
            int til = 0;
            String navn = "";

            while (reader.Read())
                if (reader.NodeType == XmlNodeType.Element && reader.LocalName == "postnummer")
                    fra = reader.ReadElementContentAsInt();
                    til = reader.ReadElementContentAsInt();
                    Debug.WriteLine("fra: " + fra + " til: " + til);
                    navn = reader.ReadElementContentAsString();

                    if (til > fra)
                        for (int i = 0; i <= til - fra; i++)
                            String postnr = "" + (fra + i);
                            postalCodes.Add(new PostalCode { City = navn, PostalCodeTxt = postnr });

                        postalCodes.Add(new PostalCode { City = navn, PostalCodeTxt = "" + fra });

                    foreach (var temp in postalCodes)




            return RedirectToAction("Index");
Question by:imfpalne
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
LVL 35

Expert Comment

ID: 40428584
I would use the built-in serializer:


Download the file to your development system. Store it e.g. under C:\Temp.


Open the Developer Command Prompt for VS2013.


In the prompt, goto C:\Temp (or where you saved your XML).


Run xsd postnumre.xml


Run xsd postnumre.xsd /classesDeveloper prompt and XSD


Create a new project or open an existing one.


Add the file created in step 5 to your solution.Solution explorer


Use the built-in deserializer.
namespace Samples
    using System;
    using System.Xml;
    using System.Xml.Serialization;

    public class Sample
        public static void Main(string[] args)
            const string URL = "http://geo.oiorest.dk/postnumre.xml";
            using (XmlTextReader reader = new XmlTextReader(URL))
                XmlSerializer x = new XmlSerializer(typeof(postnumre));
                postnumre p = (postnumre)x.Deserialize(reader);
                foreach (postnumrePostnummer pn in p.Items)
                    Console.WriteLine(string.Format("nr={0}, href={1}, navn={0}", pn.nr, pn.href, pn.navn));


Open in new window

When the error still occours, then download the file separatly, before feeding it into the deserialization.

And don't forget to add exception handling.

Author Comment

ID: 40428663
Thank you for your reply ste5an, however I would prefer a solution that would allow me to update my own data from an API kind of XML feed - I know that there is rarely changes to a list of Postal Codes, however should that happen, I take it that your solution would require me to re-download and serialize the XML - am I correct?
LVL 35

Expert Comment

ID: 40428732
Yes, you are. But it doesn't matters.

Cause your manual XML processing makes also assumptions to the XML file used. The only difference is that in this case it is sufficient to display it in a browser (download) and code the necessary steps (recreate postnumre.cs). So you're basically doing the same, just using different techniques.

But the solution would imho be the same, just download the entire file before processing it.
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.


Author Comment

ID: 40443929
Hi Ste5an, I've tried your solution - and it works. However, it's not the solution I'm after, let's say I was retrieving data from an XML source that was updated twice a week. With your method, I would have to manually download and prepare the XML file twice a week (assuming that I actually know the update cycle even..) - I need a way to dynamically call the XML whenever I choose to, check my "local" DB to see if there are any changes, and then update my local DB with the changes.

As I found out - the source also offers jSon data if that makes it any easier?
LVL 35

Expert Comment

ID: 40444655
Maybe, when it solves your problem.

Accepted Solution

imfpalne earned 0 total points
ID: 40446426
I eventually found this thread, which has the exact answer to my question:


Ste5an, thanks for trying.

Author Closing Comment

ID: 40456957
The answer in this thread is exactly what I was looking for - it speeds up the proces by loading the entire XML to a String and then process the string with xmlreader.read(String)

Featured Post

Monthly Recap

May was a big month for new releases from Linux Academy! Take a look at what our team built recently in our blog. You can access the newest releases from our blog.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Many times as a report developer I've been asked to display normalized data such as three rows with values Jack, Joe, and Bob as a single comma-separated string such as 'Jack, Joe, Bob', and vice versa.  Here's how to do it. 
Real-time is more about the business, not the technology. In day-to-day life, to make real-time decisions like buying or investing, business needs the latest information(e.g. Gold Rate/Stock Rate). Unlike traditional days, you need not wait for a fe…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.
Suggested Courses

771 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question