Scott Hanselman

The Weekly Source Code 41 - Searching Code, Sharing Code, and Reading Code (and Comments)

April 28, '09 Comments [10] Posted in Source Code
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I really advocate folks reading as much source as they can because you become a better writer by reading as much as writing. That's the whole point of the Weekly Source Code - reading code to be a better developer.

Reading code in Open Source projects is a good way to learn, especially if the project has been around a while and been successful, or if you already respect the team of people working on it. Less reliably, you can find snippets of code by searching and sharing code.

Searching Code

There's basically three players in the "Code Search Engine" space. These are the ones I bump into all the time. There could be others.

  • (where Phil Haack used to work)
  • Krugle - MSDN is using Krugle to power the MSDN Code Search Preview that searches MSDN Library, MSDN Code Gallery, and CodePlex.
    • (Note, the Krugle MSDN Code Search is going up and down, as it's in preview and they are actively developing it. If you get a login dialog, that's why. Wait a while.)
  • Google Code Search - If you have lots of code on your site you can make its existence explicit to Google by extending your Sitemap to include the CodeSearch extensions. You can also point them to your Subversion repo if it's publically available.
  • Codase - Been around forever, and still up and running, but nothing new on their homepage for 4 years? What's up? Weird. I don't count them as a player, but they were first, as far as I can see.

Searching the web is 99% free text search, as you know. Every once in a while, I'll use an advanced technique like searching with "filetype:ppt" or with a numeric range like "$1500..$3000" but seriously, that's like once in a 100 searches or less. I challenge you if you say you use it more. Free text searching almost always gets it right, unless you're searching for homonyms or something general.

Because free text is so good, while I like the idea of a code search engine and I do use them, I'm not sure if I need anything more than a "code-specific free text search." I personally believe that being really specific in your search query is a really good way to filter your way out of the ONE result you need.

Sometimes, however, when searching code you will occasionally want the advanced techniques.

Here's some examples:

If you're looking for a specific implementation of something, like an MD5 hash or a BTree, these search engines can be really useful. They can't tell you anything about quality though.

Sharing Code

On your blog...

I started using SyntaxHighlighter on my blog for all my code snippets and I'm bummed I didn't start earlier. The best aspect of it is that all my snippets are inside of <pre> tags. That means they're easily indexed and not littered with markup. The syntax highlighting is added on the client side by JavaScript. I use the PreCode plugin in Windows Live Writer and wrote up on I do it on my blog. It's fast becoming THE way to post code inline. I even convinced ScottGu (by doing it for him without asking) to use SyntaxHighlighter when I converted the Nerddinner PDF to HTML.

On the web or via IM...

You know by know that pasting code in an IM window is a recipe for pain, and misplaced emoticons. I use code-pasting services for this instead.

I really like using Josh Goebel's Pastie for sharing code, although he doesn't formally support C# or VB. I'm slowly moving to though.

The best social-code-sharing snippet sites are:

  • - Favorite of Rubyists and the "original." Couldn't be simpler.
  • - Favorite of IRC users and supports C# and dozens of other languages. Also nice because it supports "expiration" of your code in a day or a month. Nice for email or IM.
  • - Winner for best name, as "Gist" (pronounced "Jist") meaning "Essense" is a great way to express what you're trying to, ahem, express. Just the gist. Supports virtually all languages as well as a "private" option. It also supports versioning, which is unique. This makes sense since Github is a "social source control system." Here's a screencast explaining how this concept can by taking to the next level.

I've had an interesting conversation or two about making sharing code easier with Jeff. We'll see where that goes.

Code Comments

Kind of unrelated, but still fun...I think that every developer should have a blog, or at least an outlet for writing. Those that don't, often use Code Comments to express themselves.

There was a great post at StackOverflow asking for the "best comment in source code you have ever encountered." This, of course, turned into a list of the worst comments ever found in source code, because that's how programmers work, right? Best == Worst. ;) A lot like the Daily WTF.

You can find some interesting stuff if you use the code search engines to search for stuff that shouldn't ordinarily be in code. This guy searched the Linux Source Code for swear words and graphed them over time.

Some other non-explicit examples...

  • Found on Koder's searching for Poop
    ; Poor-man's Object-Oriented Programming
    ;                   or
    ;                  POOP
    (module POOP
       (import Utility)
  • Found on Krugle searching for Mind-Numbing

    // mind numbing: let caller use sane calling convention (as per javadoc, 3 params),
    439 // OR the 2.0 calling convention (no ptions) - we really love backward compat, don't we?

  • Found on Google Search searching for Hate
     # God, I hate DTDs.  I really do.  Why this idiot standard still
     # plagues us is beyond me.
  • Found on Google Search searching for Horrible
     case 'H':
  • Found on Koders searching for "God Himself"...not really a comment, but interesting.
     (c.query_gender().equals("male") ? "He" : (c.query_gender().equals("female") ? "She" : "It"))
              + " is " +
              ((c.query_level() == client.WIZ_GOD) ?
                    "the Almighty God himself\n\rBeware of his wrath if you don't follow his laws!" :
                    ((c.query_level() > client.MORTAL) ? "a powerful immortal" : "a puny mortal")))+ "\n\r"
  • Found on Google Search searching for "profoundly bad"
    if isinstance(real_child, SilentMock):
       raise TypeError("Replacing a mock with another mock is a profoundly bad idea.\n" +
        "Try re-using mock \"%s\" instead" % (name,))
  • Found on Google Search looking for "Pure Evil"
     my $db = delete $access->{db};
              # This is pure evil.
  • Found on Google Search searching for Poop, but only in Ruby files.
    "craptacular carpet droppings",

I'm sure if you search, you'll find lots of great stuff in comments, much more colorful than this. For example, the Greatest Code Comment Ever (Line 107) hit tip to Cam Soper:

uint32 sign=[fh readUInt32BE];
uint32 marker=[fh readUInt32BE];
uint32 chunklen=[fh readUInt32BE];
off_t nextchunk=[fh offsetInFile]+((chunklen+3)&~3);
// At this point, I'd like to take a moment to speak to you about the Adobe PSD format.
// PSD is not a good format. PSD is not even a bad format. Calling it such would be an
// insult to other bad formats, such as PCX or JPEG. No, PSD is an abysmal format. Having
// worked on this code for several weeks now, my hate for PSD has grown to a raging fire
// that burns with the fierce passion of a million suns.
// If there are two different ways of doing something, PSD will do both, in different
// places. It will then make up three more ways no sane human would think of, and do those
// too. PSD makes inconsistency an art form. Why, for instance, did it suddenly decide
// that *these* particular chunks should be aligned to four bytes, and that this alignement
// should *not* be included in the size? Other chunks in other places are either unaligned,
// or aligned with the alignment included in the size. Here, though, it is not included.
// Either one of these three behaviours would be fine. A sane format would pick one. PSD,
// of course, uses all three, and more.
// Trying to get data out of a PSD file is like trying to find something in the attic of
// your eccentric old uncle who died in a freak freshwater shark attack on his 58th
// birthday. That last detail may not be important for the purposes of the simile, but
// at this point I am spending a lot of time imagining amusing fates for the people
// responsible for this Rube Goldberg of a file format.
// Earlier, I tried to get a hold of the latest specs for the PSD file format. To do this,
// I had to apply to them for permission to apply to them to have them consider sending
// me this sacred tome. This would have involved faxing them a copy of some document or
// other, probably signed in blood. I can only imagine that they make this process so
// difficult because they are intensely ashamed of having created this abomination. I
// was naturally not gullible enough to go through with this procedure, but if I had done
// so, I would have printed out every single page of the spec, and set them all on fire.
// Were it within my power, I would gather every single copy of those specs, and launch
// them on a spaceship directly into the sun.
// PSD is not my favourite file format.

Enjoy your search and read more code!

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Hanselminutes Podcast 159 - IronPython in Action with Michael Foord

April 25, '09 Comments [5] Posted in DLR | Podcast | Python
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ironpythoninaction My one-hundred-and-fifty-ninth podcast is up. Michael Foord makes his living as a Python programmer. More specifically has an IronPython programmer. He chats with me about his company's use of IronPython, the DLR and why they picked Python over C# or VB.

40% OFF COUPON: Michael's hooked me up with a 40% off coupon for a limited time for Hanselminutes listeners. Just buy the book with coupon code "ironpython40".

Links from the Show

Subscribe: Subscribe to Hanselminutes Subscribe to my Podcast in iTunes

Do also remember the complete archives are always up and they have PDF Transcripts, a little known feature that show up a few weeks after each show.

Telerik is a sponsor for this show!

Building quality software is never easy. It requires skills and imagination. We cannot promise to improve your skills, but when it comes to User Interface, we can provide the building blocks to take your application a step closer to your imagination. Explore the leading UI suites for ASP.NET and Windows Forms. Enjoy the versatility of our new-generation Reporting Tool. Dive into our online community. Visit

As I've said before this show comes to you with the audio expertise and stewardship of Carl Franklin. The name comes from Travis Illig, but the goal of the show is simple. Avoid wasting the listener's time. (and make the commute less boring)

Enjoy. Who knows what'll happen in the next show?

About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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ELMAH: Error Logging Modules and Handlers for ASP.NET (and MVC too!)

April 23, '09 Comments [29] Posted in ASP.NET | ASP.NET MVC | Bugs | NerdDinner | Open Source
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Joe Lowrance said, er tweeted, it best when he said,

"the amount of attention ELMAH hasn't got is shocking."

ELMAH is one of those largely unknown and deeply awesome .NET Open Source projects that should be part of ASP.NET proper.

What is ELMAH?

I like to say that ELMAH is Tivo for your ASP.NET Errors. You can get your Yellow Screens of Death, with full call-stack back and analyze what's really happening. It's Exception Driven Development. What's it really do?

Once ELMAH has been dropped into a running web application and configured appropriately, you get the following facilites without changing a single line of your code:

  • Logging of nearly all unhandled exceptions.
  • A web page to remotely view the entire log of recoded exceptions.
  • A web page to remotely view the full details of any one logged exception.
  • In many cases, you can review the original yellow screen of death that ASP.NET generated for a given exception, even with customErrors mode turned off.
  • An e-mail notification of each error at the time it occurs.
  • An RSS feed of the last 15 errors from the log.
  • A number of backing storage implementations for the log, including in-memory, Microsoft SQL Server and several contributed by the community.

Created by Atif Aziz (@raboof on Twitter) and Scott Mitchell, ELMAH means is "Error Logging Modules and Handlers" and has been rocking my world since, well, September of 2004.

(Small Correction, Scott Mitchell helped writing the original MSDN article. ELMAH is 100% conceived of by Atif.)

From the project site:

ELMAH (Error Logging Modules and Handlers) is an application-wide error logging facility that is completely pluggable. It can be dynamically added to a running ASP.NET web application, or even all ASP.NET web applications on a machine, without any need for re-compilation or re-deployment.

ELMAH is wonderful for many reasons. First, because it just works. Second, because it's a fantastic example of effective use of HttpModules and HttpHandlers working together. Third, because it's been design with enough thought that nearly anything you'd want from it for use in a production site is there.

I'm sitting here in a cafe and I'm going to add ELMAH to the ASP.NET MVC-based Source Code. Actually, the site, as I don't need to recompile the source if I'm not doing anything tricky. ;)

Implementing ELMAH on your ASP.NET (MVC or otherwise) Site 

I download ELMAH, and I put its DLL in my /bin folder (or wherever you like to put libraries). ELMAH doesn't need to be referenced by your project directly if you don't want to. Ultimately it just needs to be in your bin folder so it can be found. You can put it in /lib and make a build event if you like, as long as it ends up in /bin.

Then I open up two instances of notepad and copy over a few HttpHandlers and HttpModules into my existing web.config. Tedious, but straightforward.

Where you put these depends on if you're using IIS6 or IIS7, but the general idea is the handlers looks like this:



and the modules looks like this:



You can pare it down a bit if you don't need ErrorMail, for example. Then, I hit my site at http://localhost:xxxx/elmah.axd and I get this Error log, similar to what you'd see via Trace.axd.

Error log for  on HANSELMAN-T60P (Page #1) - Windows Internet Explorer

Ok, no errors. Let's make some. I'll visit some messed up URLs and intentionally cause's what ELMAH says now:

Error log for  on HANSELMAN-T60P (Page #1) - Windows Internet Explorer (2)

And I can drill down and see the Yellow Screen of Death (YSOD) as it "would have been."

Error System.ArgumentException [5] - Windows Internet Explorer

Now, this assumes my ASP.NET MVC site has no error handling to speak of. ELMAH is watching for unhandled exceptions and recording them, holding them in memory. I can also setup logs to SQL Server or VistaDB or SQLLite so they'll live beyond application recycles.

You can certainly secure access to the ELMAH pages. You can also pull the errors into your favorite RSS Reader, which is a killer feature, IMHO.

Making ELMAH work with ASP.NET MVC's "HandleError" Attribute

In ASP.NET MVC there's an attribute called [HandleError] that will grab anything that goes wrong inside your controllers and show the ~\Shared\Error.aspx View. However, because it "handles" the error, it hides it from ELMAH. Remember that [HandleError] is a declarative try/catch. In my case, I want to have ELMAH handle it.

There's two ways around this.

One, I made a method in my Controller like this:

public ActionResult Trouble()
return View("Error");

In my web.config, I have a customErrors section like this:

This sends folks to /Dinners/Trouble which shows the Error page, after ELMAH takes care of it.

Second, as an advanced technique, I could write my own derived HandleErrorWithELMAHAttribute that logs the error using ELMAH's API, then passes the exception up to the default handler with ASP.NET MVC.

Looks like Dan Swatik's blog is dead. :( UPDATE: Looks like Dan Swatik was coincidentally doing a similar thing error this morning! What's nice about the solution on Dan's Blog, is that it was written with the help of Atif Aziz himself! (Remember, Atif's The primary author of ELMAH!) Here's the StackOverflow question.

My naive solution is below, but Atif's is better as it signals the error to ELMAH's pipeline rather that logging directly as mine does. Here's the more correct version:

namespace MvcDemo
using System;
using System.Web;
using System.Web.Mvc;
using Elmah;

public class HandleErrorAttribute : System.Web.Mvc.HandleErrorAttribute
public override void OnException(ExceptionContext context)

var e = context.Exception;
if (!context.ExceptionHandled // if unhandled, will be logged anyhow
|| RaiseErrorSignal(e) // prefer signaling, if possible
|| IsFiltered(context)) // filtered?


private static bool RaiseErrorSignal(Exception e)
var context = HttpContext.Current;
if (context == null)
return false;
var signal = ErrorSignal.FromContext(context);
if (signal == null)
return false;
signal.Raise(e, context);
return true;

private static bool IsFiltered(ExceptionContext context)
var config = context.HttpContext.GetSection("elmah/errorFilter")
as ErrorFilterConfiguration;

if (config == null)
return false;

var testContext = new ErrorFilterModule.AssertionHelperContext(
context.Exception, HttpContext.Current);

return config.Assertion.Test(testContext);

private static void LogException(Exception e)
var context = HttpContext.Current;
ErrorLog.GetDefault(context).Log(new Error(e, context));

Below is my naive version.

I made this HandleErrorWithELMAHAttribute:

public class HandleErrorWithELMAHAttribute : HandleErrorAttribute
public override void OnException(ExceptionContext filterContext)
var context = HttpContext.Current;
Error error = new Error(filterContext.Exception, context);
ErrorLog log = ErrorLog.GetDefault(context);
string id = log.Log(error);
catch (Exception localException)
// IMPORTANT! We swallow any exception raised during the
// logging and send them out to the trace . The idea
// here is that logging of exceptions by itself should not
// be critical to the overall operation of the application.
// The bad thing is that we catch ANY kind of exception,
// even system ones and potentially let them slip by.



Then I put the attribute on my ASP.NET MVC Controller like this:

public class DinnersController : Controller {

Either way works, I actually kind of prefer the first one, although it requires a controller to have an essentially empty method to send folks to the shared error page. I keep the /Confused and /Trouble methods in there as I think it makes the site more personal.

Anyway, ELMAH rocks and you should use it today. Phil Haack loves ELMAH too! Jeff and the guys at StackOverflow use ELMAH also, albeit a "custom fork." (Release your code, Jeff!)

Time for me to to donate some money to the ELMAH Open Source efforts.


About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Paint Fence, Cut Wood, Pull Weed, Plant Tree - Finding Geek Balance Outside My Comfort Zone

April 23, '09 Comments [39] Posted in Musings | Personal
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Please forgive me this personal excursion. I had lunch with my friend Greg Hughes yesterday. It's nice when people know you well enough to really grok when something significant happens in your life. The opening part of the conversation at lunch, in person, went something like this

Greg: Hey, great to see you, what's up?

Me: D00d. I bought wood. Like, literally went to the, what's it called? The Lumberyard and purchased actual lumber. Like, trees. Then I cut them.

Greg: Holy crap. What brought this on?

...and the conversation continued in this general vein. He understood immediately. I'm finding balance by moving outside my comfort zone. I'm trying to become "handy" around the house. My previous handy experience was tiling my kitchen backsplash, and this required that I use actual lasers to succeed.

What you need to understand, Dear Reader, is how profoundly not-handy I am to appreciate what I'm trying to do here. My father and brother are handy. I am not. I am not handy in the way that short people are not tall. They aren't. It's just so.

I have never had a hobby that didn't involve computers. This is sad, I know.

I've talked before about how it's important as a Developer to Sharpen the Saw. This is an extension of this. Go outside your comfort zone. I

I try to travel a lot, meet different people, speak their language as a way of going outside my comfort zone. Of course, I speak about computers, so that kind of cancels that out, eh? ;)


When I speak to high-school students and local colleges, I tell them that I like software because of the intense sense of empowerment - the sense that I can do this - it can give you when creating. It seems silly and obvious, but I realize more now that other things can empower oneself. I intellectualized this long ago, but internalized it only recently.

Here's what I'm doing this year to push the envelope for me. This may not make me a better developer, but I hope it'll make me (and subsequently my kids) a better, more well-rounded person. Maybe that'll make me a better developer in some round-about way. I dunno, but I sure feel handy and empowered but in a new an different way.

Planting a Square Foot Garden

IMG_0136 One day, last week, it was sunny in Oregon. I looked at the strange yellow ball in the sky and grunted and then I went and bought lumber. I figured this is what people do when it's nice out. I've talked about a garden in the yard for years. This time, I made one.

I got 9 2x12's, and 3 4x4's. The first thing I learned was that 4x4s are in fact not four inches square. Turns out the whole inches thing is just a big lie in the wood world. This was news, but now I feel informed. :)

I ordered the dirt/compost, almost broke myself unloading two yards (not sure why it's called yards, but it was a trailer-load and a lot) and last night we planted our vegetables.

Being Handy Around the House

When I get in over my head with home improvements and things, I usually call my family or a handyman. I've stopped doing that, setup a toolbox and work area and started drilling holes in the wall. I've painted/stained 400 feet of fence, weeded until my hands hurt, and moved giant rocks, all in the last two weeks.

I'm starting to get ideas for other things I want to do around the house. Why, just today, I added two small towel holders in the upstairs bathroom. Changes the whole room, I say! And, as a plus, I did not electrocute myself.

Building an Arcade Console

IMG_0036I checked on Craigslist and found an ancient 1984 Video Trivia Arcade Console. With my friend John Batdorf we took it to the garage and gutted it. I'm putting a PC inside it, and maybe an Xbox and dubbing it the Hanselcade.

This is yet another project that I'd always meant to do, but hadn't because it seemed too large, too complex, too intense to attack. I can attach large, complex and intense computer problems, but this...this was physical.

But, I'd cut wood! I'd planted plants! I just did it. I took uncomfortable action and I started to make plans. What's nice about this project - all of these, in fact - is that they are large, but they can be broken up and aren't time-urgent.

It also kind of involved computers, indirectly, in that there's a computer inside. However, stuff like hooking up LEDs, buying resistors, drilling holes in steel and keeping the whole thing stock and clean - this is all outside my zone of comfort.

The Point

I'm learning, as I always am, but I'm exercising VERY different parts of my brain. I'm reminding myself of things I'd forgotten, and filling in gaps. I'm synthesizing bits of information that I'd thought unrelated into larger solutions. I'm getting a substantial and ongoing sense of satisfaction. I'm realizing that I can be good, well, adequate, at other things that aren't computers.

If there's something you've been meaning to do, especially if it's outside your expertise, go do it now. Pull a weed. Build a fort. Start a blog. Lift a weight. Maybe two.

This must be what having a hobby is like! Ah, to be well-rounded and balanced.

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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Social Networking for Developers - Conference Talk Video

April 21, '09 Comments [13] Posted in Back to Basics | Programming | Speaking
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UPDATE: Better quality videos from another conference were found and are up here.

First, a disclaimer. This is some really seriously guerilla video. Paul Mooney was kind enough to bust out his video camera and film my keynote at Devscovery in NYC this last Monday. (This was the same trip where I hung out at the Fog Creek offices and did a "Hanselminutes on Channel 9" video.)

Paul edited the video and put it up on Here's a link to the WMV file if you want to download it. You can also watch it embedded at Neuronspark. He put a lot of work into the editing, so thank you Paul for your community efforts!

I was a little silly so it was a lot more informal then most of my talks. I ran it like a classroom/university lecture with a lot of interactivity. Basically, the talk was loose, so be aware.

One of the things that I liked about this talk was that the talk was largely influenced by a StackOverflow question. The idea was to make a talk about Social Networking using a Social Networking site. I also think, that while the question isn't a programming-specific question, it's a good example of all things community (crowd-sourced)-related.

People voted on the best answer, some voted to shut down the question completely (!), comments broke out in the question and some answers, and the question was eventually turned into a "community wiki" question with collective ownership.

Here's a snapshot of the StackOverflow question (in case it's edited). Forgive the self-quoting:

How can social networking sites make you a better developer?

I am giving a keynote at Devscovery tomorrow at 9am. The title is "Social Networking for Developers." It's 90 minutes long and I don't want to waste anyone's time.

Everyone I talk to who uses Twitter, Blogs, StackOverflow, etc, says that these sites make them "better developers." However, few are able to qualify HOW and fewer will are able to quantify HOW MUCH better.

Is it just about getting answers to questions? Is it about the developer's third place?

Help me, O Stack Overflow, O great social network of developers, with my Keynote on Social Networking. ;)

What makes developers, usually an anti-social bunch, strive to use the internet for social purposes?

How do Social Networking sites help you better do your job?

And here's the answer with the most votes, from Rob P.:

  • Social Networks are loaded with people who will remind you not to wait until the night before a talk to ask such questions :)

But seriously, I think the biggest thing it does is remind people what a good developer can be. If you are someone who enjoys to go for a jog 2-3 times a week, you could very easily be the best runner you know. You might think that what you do is at or near the limit of what anyone could expect to do.

Until you go to a 5k filled with other serious runners. Then you realize where you stand.

As a younger/not so great developer - I used to think I was a great developer. I was the best developer in my family, the best developer of all my friends and when I finally got into programming classes at school, I was the best then. Even in college. And, honestly, even in a lot of the jobs I've had.

The reminder that there are other people out there who really are leaps and bounds ahead of me and the exposure to things I didn't know existed or were possible - gives me something to strive for.

The answers and resulting discussion, along with some tips I've developed on blogging added up to a fun talk where I eventually ran out of time. I hope to give this talk again in a more organized and formal setting in the future.


About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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Disclaimer: The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.