Website for David Bolton, software developer in London, England

David Bolton.. An outlet for my creative side!

(July 2017)

The last two years has seen me create an iPhone app and for defeat being snatched from the jaws of victory by the whole thing being abandoned at about 97% in to the project. I managed to extract, process and compress 29 million addresses from the UK Postoffice Address File (PAF) searchable and built into just 100 MB of data (that includes house numbers, names and flat numbers) and fast enough that as you drag the app's Google Map screen, it can tell you what street the map center is located over including any of over 350,000 points of interest (POI) that are ATMs, supermarkets, pubs, museums etc.

All locations include lat/long though each postcodes location is roughly centred on the average lat long.

You have to be licensed to use the PAF data and I wrote this in C# (Xamarin). It's fast enough to run on an iPhone 5 and flies on an iPhone 7. Search results update with each key press (about 1/10th second delay on an iPhone 5) and it returns up to 100 matching results sorted by distance from the phone's current location. Distances are calculated using a speeded up version of the trigonometric calculations formula for working out distances between two lat/longs.

I also wrote a suite of programs to automatically extract the data from the PAF and transform that used by the app.

I can't supply the PAF (it's not mine..) so please don't ask! The code however...

I still write technology articles but no longer for or for GoParallel and recently went belly up but you can still see lots of my stuff on I also have articles on the UK Dice site as well as the US (Different articles, not the same). If you are looking for a part-time technology writer who can write software, say hi via the contact form!

I'm starting a new development job on July 3rd, based in Sleaford.

I write technical articles - I wrote About C,C++ and C# from 2006-2013), setup WordPress blogs for others (and do a bit of hosting). I'm now writing for and their uk site and you'll find my articles on

(July 2014) Finished a 3 month Contract (extended to 6 months) near Chancery Lane (London)

My Mobile App development blog

Check out which is where I blog about Xamarin development. It's a little out of date! It's not my main job any more so if you need an App created, contact me via the contact form but no promises.

Mensa 2013 AG Web slides

(September 2013) These are being polished up. (Thanks Tim) but for now the rough cut originals are there. I'll also then add pdf versions of the polished version for those who don't have Powerpoint 2007 or later.

Note also the January 2011 Slides download (Zipped up Powerpoint) from the presentation given at Bedford for Mensa on setting up a website.

2013/1/16. I'm no longer at Morgan Stanley in London, UK. One of the fallout of Morgan Stanley Redundancies after five years there working in Commodities on Oil Trading and Base Metals software development and maintaining Triplepoint products such as Tempest. I'm Looking for software developer roles in the City (London) with preference for Canary Wharf and will do contract or Permanent. I live in East London, so roles outside London would not really be appropriate.

Skill set. Extensive Delphi with over 17 years full time experience plus six years of .NET, three at Morgan Stanley. So if you have legacy Delphi code that needs converted to C# (or Java - I have 18 months of that), please contact me.

In the last 13 years I've worked at London Clearing House (Contract 2 years 97-99), Lombard Risk 6 years (2001-2007 Permanent) and Morgan Stanley 5 years (2007-2013 Permanent), plus 3 years C# experience including LINQ, some WPF and one year Java. My experience includes 5 years of Sybase ASE 12.54 plus web development (HTML, CSS, PHP) skills.

Strong team player with excellent communication skills. Please use the Contact form if you are rushing to offer me a contract.

More details on LinkedIn. View David Bolton's profile on LinkedIn

Dice Blog Network

I need to update this, as I'm now writing the C++/C# communities on and the periodic game article.

My Dice Blog Entries and Articles

My latest activities

(July 2014) Multi threaded C# for TCP/IP. How I programmed a full duplex iPhone client using Threads.

I periodically update the Gratis blog. Sole writer is me (David Bolton) about free software, games. Some of the stuff I did on before I sold it.

(December 2012). I've started a Search Engine Optimization business (Helps you get your search engine found. ). Take a look at budget seo. Two sites on the first page of Google (for their particular search phrase) already!

(February 2012) I got hit by the dreaded High CPU on Windows 2008 R2 with WMIPRVSE, but it's now solved.

(November 2011) I've been approached by to be one of their writers about web game development. I'll post links up above...

(October 2011) Good practices on the internet On ISPS Email accounts, hosting and domains.

(December 2010) I've setup a wordpess blog about reviews of gratis i.e. free stuff, mainly software, web sites and software, free iPhone apps etc. If you know of any particularly good freebies, free stuff, please let me know via the contact form.

(November 2010). I've setup a writers questions website based on the open source php software.

(October 2010). I still get letters from Domain Renewal Group (formerly Domain Registry of America) trying to slam my domains. So is domain slamming a scam?

If you're looking for the photos the link now goes to for me (David Bolton), the link on the menu takes you there, but I'll add the panoramas here. My cv has been removed- I'm not looking for a job!

This page has a lot more articles.

Act on Co2 Government propoganda trying to convince a disbelieving British Public that Global Warming is happening. Yeah right.

Short article Suggestion for Google Sitemap users, i.e. SEO or website marketers.

Latest Article

July 2009. I do get some odd emails. Here's a strange scam. A weird SEO Scam

July 2009. I saw a page on the Home Office website "Why we need ID Cards". I thought I'd highlight the dangers and the big lies they tell. why we need ID cards

July 2008. Some ongoing and updated notes on my Adventures in ASP.NET (2008)

December 22nd 2007. A warning about a sophisticated scam email Don't get taken in!

September 26th 2007. A bit of satire about Health and Safety. Health and Safety renamed to Fear of Being Sued Executive.

September 22nd 2007. Last week's events with Northern Rock inspired a reworking of XTC's Sgt Rock song lyrics for Northern Rock (is going to help me).

July 17th 2007. An easy way to generate and use very long passwords (typically 80 chars). A small utility is provided (with full source code in delphi).

Jan 9th 2007. A review of the open source blogging software used in Review of pivot blogging software Ironically in July 2007 I had to shift to WordPress! Too much CPU use by Pivot.

Dec 5th 2006. Article about an Email Scam I received today.Euro Business Guide is a scam

Nov 16th 2006. Short article about - A standard for site submission

Nov 3rd 2006. Mentos and Diet Coke Experiments to be banned

31st October 2006. Averting Global Warming article added.

24th October 2006. DIY EMP Generator article added.

9th August 2006. website launched today. (No longer active)

24th July 2006. The banned Camra poster ad!

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