Scott Hanselman

.NET Core 1.0 RC2 - Upgrading from previous versions

May 19, '16 Comments [24] Posted in ASP.NET
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.NET Core at Core RC2 is out, it's open source, and it's on multiple platforms. I'm particularly proud of the cool vanity domain we got for it. ;) It makes me smile.

Here's the important blog posts to check out:

Head over to and check it out. A great aspect of .NET Core is that everything it does is side-by-side. You can work with it without affecting your existing systems. Be sure also explore the complete .NET Downloads Page for all the manual downloads as well as SHA hashes.

The best way to develop with .NET Core on Windows is to download the Visual Studio official MSI Installer and the latest NuGet Manager extension for Visual Studio. If you don't have Visual Studio already, you can download Visual Studio Community 2015 for free.

We'll have documentation and insights on how to moving from ASP.NET 4.x over to ASP.NET Core 1.0 soon, but for now I've collected these resources for folks who are upgrading from previous versions of .NET Core and ASP.NET Core (the framework formerly new as ASP.NET 5).


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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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Playing with TensorFlow on Windows

May 15, '16 Comments [25] Posted in Open Source
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TensorFlow is a machine learning library from Google. There are no Windows builds but I wanted to run it on Windows. There are some other blog posts that show people trying to get TensorFlow running on Windows with VMs or Docker (using a VM) but they are a little complex. This seems like a great chance to see of I can just run Bash on Windows 10, build TensorFlow and run it.

TensorFlow on Ubuntu on Windows 10

I'm running Windows 10 Insiders Build 14422 as of the time of this writing. I launched Bash on Windows and followed these pip (Python) instructions, just as if I was running Linux. Note that the GPU support won't work so I followed the CPU only instructions from my Surface Pro 3.

$ sudo apt-get install python-pip python-dev
$ sudo pip install --upgrade

It built, then I tested it like this:

$ python
>>> import tensorflow as tf
>>> hello = tf.constant('Hello, TensorFlow!')
>>> sess = tf.Session()
>>> print(
Hello, TensorFlow!
>>> a = tf.constant(10)
>>> b = tf.constant(32)
>>> print( + b))

Cool, but this is Hello World. Let's try the more complex example against the MINST Handwriting Models. The simple demo model for classifying handwritten digits from the MNIST dataset is in the sub-directorymodels/image/mnist/ You'll need to check when your mnist folder is.

$ cd tensorflow/models/image/mnist
$ python
Successfully downloaded train-images-idx3-ubyte.gz 9912422 bytes.
Successfully downloaded train-labels-idx1-ubyte.gz 28881 bytes.
Successfully downloaded t10k-images-idx3-ubyte.gz 1648877 bytes.
Successfully downloaded t10k-labels-idx1-ubyte.gz 4542 bytes.
Extracting data/train-images-idx3-ubyte.gz
Extracting data/train-labels-idx1-ubyte.gz
Extracting data/t10k-images-idx3-ubyte.gz
Extracting data/t10k-labels-idx1-ubyte.gz
Step 0 (epoch 0.00), 9.3 ms
Minibatch loss: 12.054, learning rate: 0.010000
Minibatch error: 90.6%
Validation error: 84.6%
Step 100 (epoch 0.12), 826.7 ms
Minibatch loss: 3.289, learning rate: 0.010000
Minibatch error: 6.2%
Validation error: 7.0%

This set appears to be working great and is currently on Step 1500

There's bugs in the Bash on Windows 10, of course. It's in Beta. But it's not a toy, and it's gonna be a great addition to my developer toolbox. I like that I was able to follow the Linux instructions exactly and they just worked. I'm looking forward to seeing how hard I can push Ubuntu and Bash on Windows 10.

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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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10 years and over 520 episodes of podcasting - Tech is a marathon, not a sprint

May 12, '16 Comments [28] Posted in Musings
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I try not to be prideful, as a rule, but darnit, I'm REALLY proud of my podcast. As of this writing I've done 526 episodes. Each one 30 minutes long. Every Thursday, for the last decade. That's over 250 hours of technology talk that promises not to waste your time.

I started Hanselminutes: Fresh Air for Developers almost as a joke. Podcasting was just starting up and I felt at the time that it was largely kind of a vapid copy of talk radio. Hours of directionless rambling. I said to my buddy Carl Franklin that a show shouldn't waste your time and force you to fast-forward 20 minutes in to get to the meat. He said, you should start a show. I laughed, and I did.

HanselminutesOver 10 years later, here we are, having built a significant piece of creative, informational, and pseudo-journalistic work. While other podcasts come and go, many with the "two dudes on Skype" format, I've chugged along. While I do over a million downloads a year, I've never cracked into any mainstream technology podcasting charts or iTunes Top Ten. I think about that sometimes, a little bummed, but I realize that this show and it's content is as much for me as it is for you, Dear Listener. This isn't a popularity much as one can appreciate recognition.

I talk to anyone and everyone about all things tech. The show started before I went to work at Microsoft and will continue long after, I'm sure. It's a non-denominational technology show.

The show also aims to be intentionally inclusive without being heavy-handed. Showcasing diversity in technology isn't about "hey, we need a Black guy this week, know anyone?" That's insulting to everyone. Instead, I've cultivated an amazing network of amazing people from all over the world, and I talk to them about what they love to do. This has some wonderful side effects when recently without planning, 7 of the last 8 shows featured women!

The faces on this archive page go on and on. I'd encourage you to scroll and explore the wall of topics. There's hundreds of highlights, but here's a few favorites:

I am also proud of the show talking to people before (sometimes) they went mainstream or got famous. From interviews with Tim Ferriss in 2007, Kimberly Bryant from BlackGirlsCode in 2012Baratunde Thurston in 2010, Dr. Michio Kaku, author Lauren Beukes, as well as the now legendary show on Geek Relationship Tips with my wife, I've got you covered! You'll often hear it here first.

We were also one of the first podcasts to have a transcriptions/PDFs of the show for the hard of hearing and folks who like to read along while they listen. I struggle with keeping transcripts up to date and we're about a year behind but I'm looking for sustainable solutions. I'd like to get the transcripts available in HTML and posted on the side next to the shows so they'd be more easily searchable.

I want to thank you and remind you and yours that the show exists and continues weekly in earnest, every week with amazing topics and powerful guests. Above all, don't just keep listening, but please, share episodes socially and do encourage your friends and colleagues to listen and subscribe. Your letters and your kindness (as well as your guest suggestions) keep me going.


Thanks everyone for your support and help over the last decade. Here's to another ten years, eh?

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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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Chatting with Prince on AOL in 1999 - "this way is modern"

April 24, '16 Comments [9] Posted in Musings
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Erica Kennedy chats with Prince on AOL in 1999Before the Internet as we know it today, before social media, there was AOL. Specifically there was AOL chat rooms. The digital world was smaller but Prince was always there. He was so ahead of his time digitally. The Purple One did group chats with fans all the time on AOL. A "room" in AOL chat parlance was like a Twitter DM - a private chat room.

Six years ago my friend Erica Kennedy and I were talking about what she was going to write for her next book. She had just released her second book, Feminista, and was pretty well known for her first book, Bling that satirized the music industry that she came up in. We had the idea of  a Kindle Single detailing her interactions with Prince while she was working on a profile for InStyle Magazine. You can see photos of Prince's Spanish Villa and a few lines of Erica's AOL chats with Prince over at InStyle now.

This is the AOL chat log detailing her interactions with Prince that Erica emailed me while we were planning her novella.

Here, of course, "NPG---" was Prince's private AOL chat handle at that time while Ekj4 is Erica. I have kept all the typos exactly as they occurred in 1999.

Erica K to me - u r the 1st person 2 c this outside of the N style staff.

NPG---:   high
Ekj4:       hi 2 u
NPG---:  is ur last name kennedy?
Ekj4:       no it's my middle name that i use for writing, trying to stay on the dl
NPG---:  r u alone?
Ekj4:       sure am
NPG---:  have u ever spoke in private chat space?
Ekj4:       all the time!
Ekj4:       i'm a terrible typist though
NPG---:  would u like 2 go a room?
Ekj4:       what room? what's wrong with this way?
NPG---:  don't like
Ekj4:       ok, where's the room?
NPG---:  it's called...
NPG---:  amatteroftime
Ekj4:       how do i get THERE?
NPG---:  use the icon that says....people
NPG---:  c it?
Ekj4:       yes. and...
NPG---:  start ur own chat
NPG---:  private
NPG---:  type in the space....amatteroftime
Ekj4:       is it only going to be u and i?
NPG---:  yes
Ekj4:       ok
NPG---:  scared?
Ekj4:       no
NPG---:  yea,right!
NPG---:  r u there?
Ekj4:       yep
NPG ---: is ur hair done?
EKJ4:       it’s up in a ponytail and truth be told, it’s lookin’ kinda busted.
NPG---:  lol!
EKJ:        my hair doesn’t have the bounce of your ‘do.
NPG---:  do u stay up late?
EKJ:        24-7.  Actaully more like 20-7.
NPG---:  good.
EKJ:        y?
NPG---:  my flight gets in at 1 am
EKJ:        great, ur  coming 2 ny?  u want me 2 meet u at 2?
NPG---:  I can send a car 4 u
NPG---:  if u like
Ekj4:       yes, that would be great. don’t have a sister trying to hail a cab in crooklyn at all hours.
NPG ---:  r u a sista?
Ekj4:        haven't we been over this?  u will c
NPG---:   what do u look like?
NPG---:   describe urself!
Ekj4:        i'm skinny
NPG---:   u eat meat?
Ekj4:        on occasion
NPG---:   then y r u skinny?
Ekj4:        just got it like that
NPG---:   skinny parents
Ekj4:        i actually eat way too much junk food
Ekj4:        i'm skinnier than everyone in my family
NPG---:   do u think we could complete an interview like this?
Ekj4:        no, we cannot do the interview this way, but doesn't matter. u'll be here in a minute
NPG---:   y
NPG---:   then u have direct quotes

but this way is modern

Ekj4:        it neesd to be face to face
NPG---:   y?
Ekj4:        yes, but i have to set the scene. you get better feeling about the person that way
Ekj4:        anyway, this could be aaron for all i know.
NPG---:   but this way is modern
Ekj4:        yes, it is. i love to chat online
NPG---:   eye am not a liar
NPG---:   this way is cooler
NPG---:   and eye don't get motion sickness
Ekj4:        so u think we will just have some time tonight or would you be down to...
Ekj4:        hang over the weekend if i need more time?
Ekj4:        ur not going to be all drowsy, r u?
NPG---:   eye have 2 fly 2 oakland
NPG---:   2morrow
Ekj4:        for what? the all star game?
NPG---:   eye am never drowsy
NPG---:   yes ...the game
Ekj4:        u r going?
Ekj4:        i watch all teh games. i love the t-wolves and kg
Ekj4:        but i root for the knicks
NPG---:   eye maybe cannot go if eye go 2 new york
NPG---:   2 much flying makes me barf
Ekj4:        npg---, u sleepin'?
NPG---:   eye wanna c the slam dunk competition up close
Ekj4:         is kg in it?
NPG---:   no doubt
Ekj4:        you hang with him in minn?
NPG---:   if u were me...would u fly thamuch
Ekj4:        no i don't like to fly that much.  the loss of control and everything
Ekj4:        y ru coming here for 1 day? to do the interview?
NPG---:   yes, eye am coming unless u allow me 2 do something cooler
Ekj4:        i think u should come
NPG---:   eu
Ekj4:        eu?
NPG---:   do u know what that means
Ekj4:        please explain
NPG---:   this:
NPG---:   :P*******
NPG---:   me barfing
Ekj4:        lol!!!!
Ekj4:        why r u barfing?
NPG---:   HEY,not so loud!
Ekj4:        so r u coming or not?
NPG---:   yes, eu
Ekj4:        GREAT!

u type like me

NPG---:   we will call when eye ge there
Ekj4:        1derful
NPG---:   u type like me
Ekj4:        now that u have my e-mail, don't send me any spam!
Ekj4:        chain letters and nonsense
NPG---:   won't send u any mail
NPG---:   ever
NPG---:   many people use this screenname...
Ekj4:        ok, npg---
NPG---:   it's secret, so don't divulge it, ok?
Ekj4:        oh, good so you can maintain your privacy. of course, bro
NPG---:   ever go 2 prince. org?
Ekj4:        can't say that i have. do u?
NPG---:   once or twice
NPG---:   interesting?
NPG---:   yes
Ekj4:        i don't think i would like 2 c what random people r saying about me
NPG---:   sometimes it is funny
Ekj4:        taht would be strange but i guess you have become accustomed 2 it
NPG---:   yes
NPG---:   so, eye must go and pack, then
NPG---:   bye bye
NPG---:   c u 2night
Ekj4:        c ya later, inshallah
NPG---:   peace

I loved these chats because they are a reminder that our legends are also real people. He loved technology, Prince started YesWeCode with Van Jones to inspire more Black Youth to get involved in tech.

I talked to Erica on the phone just two day before she passed away. I miss our regular talks and her energy but most of all I miss my friend.  Prince is gone now as well, and even though he was a legend he was also a real human who loved people. He was a tech visionary who appreciated very early on how technology could bring us all together.

20 years later Prince would still reply to fans directly on Twitter (and often delete the tweets, adding to his air of mystery.) He was known to even engage in lengthy private DMs with fans and superfans.

I love what InStyle said about these Prince's AOL chats.

Internet chat from a rock star looks like Internet chat from anybody else.

I miss you two and what you brought to our lives. I'm glad we have your legacy and your work to remember you by.

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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An update on ASP.NET Core 1.0 RC2

April 14, '16 Comments [84] Posted in ASP.NET
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What's going on with ASP.NET Core 1.0 RC2? Why is RC2 taking so long over RC1 and what's going to happen between now and the final release? I talked to architect David Fowler about this and tried to put together some clear answers.

This stuff is kind of deep and shows "how the sausage gets made" so the TL;DR version of this is "the guts are changing for the better and it's taking longer than we thought it would to swap out the guts."

That said, ASP.NET Core RC2 has some high level themes:

Re-plat on top of the .NET CLI

This is the biggest one and there are quite a few changes and tweaks made to the hosting model to support this. The way your application boots up is completely different. I'd encourage you to take a look at the Some of the changes are very subtle but important. We baked a bunch of assumptions into DNX specific for web applications and now we're building on top of a tool chain that doesn't assume a web application is the only target and we have to account for that.

There were a couple of fundamental things affected by this move:

  • Acquisition
    • How do you get the tool chain and shared runtime?
  • Runtime
    • The API used to find dependencies at runtime ILibraryManager
    • The API used to find compilation assemblies at runtime ILibraryExporter
  • Tooling
    • There's no dnvm replacement
    • Visual Studio Tooling (UI) support needs to use the new CLI
    • OmniSharp needs to use the new CLI
    • What's the dnx-watch successor?

The list goes on and on. I'd suggest watching the ASP.NET Community stand up as we're pretty transparent about where we are in the process. We just got everyone internally using builds of Visual Studio that have CLI support this last week.

The new .NET CLI (again, replacing DNX) will be the most de-stabilizing change in RC2. This is a good intro to where things are headed There's been tons of changes since then but it's still a good overview.

Moving to netstandard

This has been a long time coming and is a massive effort to get class library authors to move to the next phase of PCL. This is critical to get right so that everyone can have their favorite packages working on .NET Core, and as such, working everywhere.

.NET Standard Library means a modular BCL that can be used on all app models


We're looking at all of the patterns that we have invented over the last 2 years and making sure it's consistent across the entire stack. One example of that is the options API. We went through the entire stack and made sure that we were using them consistently in middleware and other places. That is a breaking change but it's an important one.

Other examples of this include things like making sure we have the right extension methods in places and that it looks like they were designed in a coherent manner (logging is an example).

Other small things:

  • Remove the service locator pattern as much as we can. Some of this requires API change.
  • Making sure we have the right set of DI abstractions so that DI vendors can properly plug into the stack.
  • Taking the time to look at feedback we're receiving to make sure we're doing the right things. This is ongoing, but if there are small changes we can make that solve a common issue people are having, we'll make that change while we still have this freedom.
  • Change how we plug in and configure servers in our Hosting APIs

Fundamentals - Stress, Security, Performance

This is always ongoing but now that most of the features are done, we have more time to spend on making things like Kestrel (the web/app server) rock solid and secure.

We're also doing more stress runs to make sure the stack is very stable memory wise and to make sure nothing crashes .

More Performance

This is part of fundamentals but deserves to be called out specifically. We're still making changes to make sure things are very "performant." Some of these are tweaks that don't affect consuming code, others are actual design changes that affect API. MVC is getting tons of love in this area ( HttpAbstractions and other higher level APIs are also getting lots of love to make sure we reduce allocations for things like file upload.

We're also looking at higher level scenarios to make sure that not only focusing on microbenchmarks. You can see some of them at

Techempower is still on our radar and we're running the plain text benchmark on similar hardware now and comparing against the competition (we're in the top 10 right now!) and we'll hope to be there and official for RTM.

I hope this gives you some context. We'll cover this and more every week on the Community Standup as we move towards RC2, then on to RTM on three platforms!

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