Bill Sempf

A recent reader emailed to wax poignant about VB6, and ask about dynamic typing – among other things – in VB.NET.  although I feel that static typing has a more firmly established place than ever in software development, I commiserated with him in this response:

A lot of people agree with you.  There is even a well-established petition at http://classicvb.org/ that states these and a lot of other problems with VB.NET, and the .NET Framework in general.

However, you have to remember that VB.NET is a language, and VB6 is a program, language and framework all in one.  As I pointed out in Chapter 1, they are designed to do different things.  A lot of the things that you could do in VB6 are considered bad practice now, due to scalability and other issues, although many are coming back into vogue. 

For instance, you point out the Variant issue.  What you are saying here is that VB6 is dynamically typed and VB.NET is strongly typed.  Coding for a strongly typed system is a lot slower than for a dynamically typed system.  You will, however, have a lot fewer errors with a statically typed system because any typing issues will usually be caught at compile time.

I have always found it interesting that many community members belittle VB6 for being a 'hack' out of one side of their mouth, and then extol the speed and ease of Ruby out of the other side of their mouth, never realizing that the dynamic typing system is a common defining characteristic of both 'languages'. 

I should add that dynamic typing is coming back in VB10 (as it is in C# 4.0) with the dynamic language runtime.  Hopefully that will return some of the flexibility to the language that you are looking for.

Defcon 17 is in the books, and Gabrielle and I had another fantastic time.  Props go out to all of the Defcon staff.  The Locksport International team and TOOOL put another fantastic lockpicking village together.  Coffee Wars pulled a record turnout of thirty-six brews, and we met some great people there.  (We lost badly.) And thanks to the hard working goons we met.

We arrived on Thursday, but with the new Defcon 101 tracks, we were practically late.  The lines weren’t much worse than usual but there was a badge shortage right away thanks to the fine people at Chinese Customs.  Gabrielle and I ended up with paper badges at first, but Gabrielle social engineered us into two actual badges soon thereafter.

The badge, as usual, is fantastic.  Kingpin did an over-the-top job of building a sleek, simple badge that still has lots of hacking potential and out-of-the-box functionality.  It uses the 32 pin MC56F8002 processor, with a microphone and an RGB LED to produce visual effects from aural input.  Wired Magazine actually published the open source firmware.  I am not a hardware hacker, but I have been working on getting it to produce different visual output based on pitch rather than volume.

I didn’t get his name, but one of the engineering team from Freescale (the company that made the microprocessor on the badge) came to the con.  He just set up shop in the Hardware Hacking Village and helped people program the board.  It was one of the coolest things I have seen at any con.  As some of you probably know, my hardware experience is circa 1979.  He effortlessly moved between helping me with the most basic soldering questions to the most advanced programming questions.  I was blown.  Get me his address, someone.  I want to send him a bottle of Scotch.

It seemed like the traffic flow was worse at first compared to Defcon 15, but it soon leveled out.  Part of the problem was the need to clean out the rooms fully and then count them coming back in due to the fire code.  The marshals were around, and very visible, throughout the con.

There is a lot of talk about the Riv being too small.  I happen to disagree – I think that DT just needs to find a logistics volunteer that will orchestrate the talks in such a way to control the crowds.  I have seen Gabrielle do it.  It is possible.  (You hear that Jeff?  She will work for Absolut.)  The people at the Riv work their collective asses off to make it a good con and you just can’t replace that.  Let’s change the logistics instead.

Oh wait, there was technical content too!  Who knew?

The most significant thing I learned is that for all of the protections for CAS in the .NET Framework, there is a mind blowing flaw.  The framework assemblies are just called by name.  If you replace an assembly, EVERY .NET program on that machine will use the altered DLL to run the program.  Does that mean if you replace the encryption protocol to email the keys to China, that all programs will send that key to China?

Yes.

Discuss.

Props to Erez Metula.

There was a great talk on using iMacro to do screen scraping for AJAX sites, and I plan on getting some new PoCs for that up in the future.  It wasn’t rocket science, but it was a really good implementation of a simple idea that I sure as hell didn’t come with.  I mean, if it was easy, everyone would be doing it, right?  Screen scraping is a massively underused art.  There is a LOT of information out there and the web browser just sucks for really making use of it.

So much net development was done on Metasploit in the last 12 months that they got an entire track dedicated to it.  The biggest piece is undoubtedly the Oracle module, which really puts all of the disparate Oracle attacks into one place for ease in testing.  I can’t recommend its use enough if you are a pen tester or in charge of db security

The civil liberties content was significant compared to 15.  Nearly one whole track for three days was filled with lawyers telling us how not to go to jail when we fly to Italy on vacation with some music of questionable origin on our laptop.  I just popped in and out of these, but every time I did I learned something.

 Did you know that if you are asked to give up your password in the states you can say “come back with a warrant” but if you are flying overseas, they can just take the machine without your permission, copy the whole hard drive, and say “Thanks for the warez, d00d.”  Lesson learned?  Carry an empty laptop overseas and download your data set from a secure channel once you get there.   When done, upload results and clear the machine again.  Microsoft doesn’t even LET you carry a machine overseas.

Speaking of privacy (weren’t we, really?) social networking was a huge topic this year.  Tom Eston and Kevin Johnson gave a great talk on some proof of concept work they did on social networks and trust.  For instance, set up a parody account of a ‘B’ celebrity, and gain trust of followers.  Then send out a link for a fun quiz with an XSS attack.  Gain twitter cookie, get password, rinse and repeat.  Social Butterfly is another of their tools, which manages the creation of apps in social networking sites like Facebook.  It collects user accounts to be used for research purposes.  Check it out.  It’s not just that picture of the Christmas party last year that will get you in trouble on Facebook.

Locksport village was very informative, very well attended, and very well stocked.  I picked up some new equipment and finally met both Schuler Towne and Doug Farre in the flesh.  Doug and I are going to make some moves toward getting the Locksport International organization a little more, well, organized, and get things up and running there. 

Gringo Warrior was a hoot.  I supplied the live guard with a cigar (which he really needed!) and watched.  Deviant had a whole boatload full of people, and I hadn’t practiced enough, so I didn’t do it this year.  Maybe next year.  The ah-ha moment for that was watching a very accomplished picker run the whole gamut in three minutes, and then spend ANOTHER three minutes trying to open the car door.  After that, Deviant stood by the auto locks and yelled “Everyone look!!”  Took out his auto jigglers.  “Easy lock,” pop.  “Medium lock’” pop.  “Hard lock,” pop.  “GET some jigglers people!  They aren’t that expensive!”  I got some jigglers.

My Defcon moment had to be standing in the elevator lobby waiting for a ride down from my floor, when thmping bass – LOUD thumping bass – became clearly audible.  I thought “that’s one hell of a boom box.”  Wait.  Aren’t those lights?

The door opens, and there is a full mobile DJ station in the elevator.  I kid you not.  There was a mini-rave going on right there in the elevator with a DJ and dancing babes and the obligatory big white guy who can’t dance just bobbing his head and looking cool.  It had to have been the coolest thing I have ever seen in an elevator, bar none.

Can’t wait for next year, folks.  This one was fantastic.  Till then, see you at PhreakNIC!

Just finished up a presentation on Visual Studio 2010 for ICC's MS Dev special interest group.  A good time was had by all.  I used the card deck that is in the Training Kit, and added a few salient slides.  We had a lot of conversation about Linq, WPF and the lifecycle integration.

My slide deck can be downloaded here, and I also wanted to post a few links that I mentioned in the talk.

• VS 2010 download
• Some best practices surrounding downloading VS 2010
• The hack for getting around the VS expiration
• Some other Activation notes
• The post about linq-to-sql end of life
• The VS training kit

I hope to get some comments back - feel free to email me, especially if they are bad.  (heh)  Thanks to all for attending!

I bet you all think that I mean failing at writing  the game, didn't ya?  Hmm?  Ha!  Not so fast my friend, I mean handling the last requirement in the project - failing the press the correct letter before the letterbox hits the bottom of the screen.

So what I want to do is check on timer click of the letter has hit the bottom, and if it has then fire off a new message (Oh no instead of Wow) and get a net letter at the top,  Should be good enough for a three year old, I figure.  As I get better in XAML I can make more features, right?

To start off I will modify the ShowWow so that it accepts a TextBlock and renders its transform no matter what it is.  I changed the name of the function to ShowMessage and used the VB refactoring feature to change all references.  Then I altered the signature to accept a textblock as a parameter, and used that object in the code instead of WowTextblock.  Finally, I changed the calling function so that it passes un WowTextblock.  Sounds like a lot, but it just took a second.  ShowMessage now looks like this:

Public Sub ShowMessage(ByVal blockToTransform As TextBlock)
    'Make an animation for the scale
    Dim blockAnimation As New DoubleAnimation(0, 100, New Duration(New TimeSpan(0, 0, 3)))
    'Make another for the opacity
    Dim blockOpacity As New DoubleAnimation(1.0, 0.0, New Duration(New TimeSpan(0, 0, 3)))
    'Go grab the ScaleTransformation from the XAML and se tthe properties
    Dim blockTransform As ScaleTransform = DirectCast(blockToTransform.RenderTransform, ScaleTransform)
    blockTransform.CenterX = 11
    blockTransform.CenterY = 7
    blockTransform.ScaleX = 1
    blockTransform.ScaleY = 1
    'Then run all of the animations
    blockTransform.BeginAnimation(ScaleTransform.ScaleXProperty, blockAnimation)
    blockTransform.BeginAnimation(ScaleTransform.ScaleYProperty, blockAnimation)
    blockToTransform.BeginAnimation(TextBlock.OpacityProperty, blockOpacity)
End Sub

Alright, now I need to add a XAML element that has the Oh No! text in it.  I think I'll make it red.  I just copied the Wow! textblock and edited it.

<TextBlock x:Name="ohNoTextblock" Opacity="0" Foreground="Red" HorizontalAlignment="Center" VerticalAlignment="Center" Text="Oh no!" Visibility="visible">
    <TextBlock.RenderTransform>
        <ScaleTransform></ScaleTransform>
    </TextBlock.RenderTransform>
</TextBlock>

So now clockCheck looks like this:

Private Sub ClockCheck() Handles gameClock.Tick
    letterBoxTop = letterBoxTop + 10
    letterBox.Margin = New Thickness(letterBoxLeft, letterBoxTop, 0, 0)
    'Check to see if it is at the bottom
    Dim bottom As Double = gameBoard.Height
    If letterBoxTop + letterBox.Height > bottom Then
        'It has hit the bottom.  
        gameClock.Stop()
        scoreCount = scoreCount - 1
        'Fire the Oh No message
        ohNoTextblock.Opacity = 100
        ShowMessage(ohNoTextblock)
        'Restart the letter
        SetupLetterBox()
        gameClock.Start()
    End If
End Sub

And there we are!  Kid tested, mother approved too.  I'll post a video of Adam playing it this weekend, when I do my post about further enhancements.  Also, I will check in the changes to CodePlex right now before I forget.

To create a release in CodePlex, I just had to go to the releases tab and Add a New Release.  That gives me a really nice little mini-wiki for the release, and an upload facility for the binary.  I made a few notes and loaded it up!  CodePlex is a really nice, simple facility for opensource work - better than SourceForge for simple projects.  I like it a lot.

I hope this little series has been helpful to everyone - it sure has for me.  I think that XAML is likely the future of Microsoft UI programming, so it behooves us all to get our feet wet as soon as we can, to make the curve less steep when our projects make the move.  Please leave any thoughts in the comments.

OK, we have th game basics, we have enforced the game rules, now we need to make it playable.  In order to do this (according to the original requirements) we need to

1. Add a little pizzaz to the notifications
2. Handle it when the player looses a letter

So I found that in order to proceed with this project, I needed to define a few terms.

• XAML - it's basically HTML.
• WPF - It's ASP.NET, or Cold Fusion, or JSP.  Control that render XAML, like the ASP.NET controls render HTML.

So where does this leave us?  A whole, totally new library to learn, after having already learned HTML since 1992 when it had twelve tags.  Oh, and you windows programmers?  You too.  This replaces EVERYTHING - Windows "ActiveX" and web.  It's global!  Yay.  Replaces Flash even - WPF and XAML run Silverlight.  Rah.  I can't even hide my excitement.

So why am I upset?  Well, I like HTML.  It does what I need.  But I understand that it doesn't fill 100% of what people want, and XAML with WPF probably will.  Problem is when you make a tool that meets everyone's needs, it becomes unusable.  As that say the docs are 'tl;dr;: 'too long; didn't read'.  There are hundreds of options - in HTML there are a few dozen.  Some say that constrains creativity, I think it enhances it.  To each their own.

Polymorphic animation.

Anyway, it's a technology that the biggest software company in the world has embarrassed so I should learn it right?  Right.  There are at least two ways to put text in the viewable area - the letterBox, which we are using for the Game Piece, and the textblock.  The TextBlock is what is needed for the Wow! animation.

One of the nice things about XAML is that it is polymorphic.  Polymorphic is the property of being able to be context sensitive.  If you have a fruit class, and there is a Fruit.Peel method, a polymorphic Peel method will know that you take the skin from a banana, take the seeds out of a pomegranate and don't bother with a grape unless you are making pie.  (No really.  My stepmom just made a grape pie last month.  It was yummy.)

I am pontificating and this is supposed to be a liveblog of a project.  Let it be said that you can apply an animation to an object, and they are truly polymorphic.  Therefore, we have a textblock, and we want to apply two animations to it.  The animations will automagically treat the textblock properly, thus showing us their polymorphic nature.

Enough of that. 

I want a flying 'Wow'.  To do this, I need to animate two properties: the scale of the block, and the opacity of the text.

There are two ways to implement an animation in WPF.  You can use a storyboard in XAML, which is more of a Microsoft Expression thing to do, or you can apply the methods in code, which is what I want to do.  This is a VB blog, after all.

To animate the scale, I have to add an empty ScaleTransform object to the TextBlock.

<TextBlock x:Name="wowTextblock" Opacity="0" Foreground="Green" HorizontalAlignment="Center" VerticalAlignment="Center" Text="Wow!" Visibility="visible">
    <TextBlock.RenderTransform>
        <ScaleTransform></ScaleTransform>
    </TextBlock.RenderTransform>
</TextBlock>

This isn't necessary with the Opacity animation because the Opacity is already a property of the TextBlock.  I know that Width and Height are too, but scaling them isn't.  I suppose I can get behind that.  Anyway.

To animate the block, I am going to make two DoubleAnimation objects, and then BeginAnimation them one after another.  The Opacity I can directly apply, but the Scale I have to go get from the XAML and then set a few properties for.  I packed the whole thing into a subroutine I called ShowWow.  I will replace the old MessageBox.Show with a call to the new ShowWow method.  Here is the code:

    Public Sub ShowWow()
        'Make an animation for the scale
        Dim wowAnimation As New DoubleAnimation(0, 100, New Duration(New TimeSpan(0, 0, 3)))
        'Make another for the opacity
        Dim wowOpacity As New DoubleAnimation(1.0, 0.0, New Duration(New TimeSpan(0, 0, 3)))
        'Go grab the ScaleTransformation from the XAML and se tthe properties
        Dim wowTransform As ScaleTransform = DirectCast(wowTextblock.RenderTransform, ScaleTransform)
        wowTransform.CenterX = 11
        wowTransform.CenterY = 7
        wowTransform.ScaleX = 1
        wowTransform.ScaleY = 1
        'Then run all of the animations
        wowTransform.BeginAnimation(ScaleTransform.ScaleXProperty, wowAnimation)
        wowTransform.BeginAnimation(ScaleTransform.ScaleYProperty, wowAnimation)
        wowTextblock.BeginAnimation(TextBlock.OpacityProperty, wowOpacity)
    End Sub

Of course, you can download the whole thing from the codeplex site for the project.  Next time, we'll handle missed letters, and then call it a project.  Have fun!  I hope this is being some help to those working in WPF.

And we are back at the Letters Are Falling project, which has it's own Codeplex URL now ... heh.  If you remember from the last post, we need to

1. Randomize the letter.
2. Randomize the start position right to left.
3. Make it more fun when you win.
4. Handle it when you lose.

I am going to start with the first two.  For now, I am going to keep this pretty declaritive, and try and use the WPF objects 'correctly' later once I get the bugs worked out of the logic.

Let's add two functions: one for the left randomization and one for the letter randomization.  The left randomization needs to set the left margin anywhere from zero to the width of the window minus the width of the letterBox.  The letter randomization needs to pick from a selection of letters, which we will later make configurable.

Now, certain other things have to happen to make this a game.  It has to restart when you get the right letter, keep score, things I forgot in the original requirements.  In order to do this, I have to set up the game to reset the letterbox, and not have all of the code in the form load event.  To do this, I have built a new function to set up the letterbox, which calls the two new randomization functions.  Then I can change my keypress event to make some gametime decisions, including a Quit function.

The VB file now looks like this:

   1:  Class gameBoard

   2:      Public WithEvents gameClock As New DispatcherTimer

   3:      Private letterBoxTop As Double = 0

   4:      Private letterBoxLeft As Double = 0

   5:      Private scoreCount As Integer = 0

   6:      Private Sub gameBoard_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded

   7:          SetupLetterBox()

   8:          gameClock.Interval = New TimeSpan(0, 0, 1)

   9:          gameClock.Start()

  10:      End Sub

  11:      Private Sub SetupLetterBox()

  12:          letterBoxLeft = GetLeftMargin()

  13:          letterBoxTop = 0 - letterBox.Height

  14:          letterBox.Margin = New Thickness(letterBoxLeft, letterBoxTop, 0, 0)

  15:          Dim currentLetter As String = GetLetter()

  16:          letterBox.Content = currentLetter

  17:      End Sub

  18:      Private Sub LetterPress(ByVal sender As System.Object, ByVal e As System.Windows.Input.KeyEventArgs) Handles MyBase.KeyDown

  19:          If e.Key.ToString.ToUpper = letterBox.Content.ToString.ToUpper Then

  20:              gameClock.Stop()

  21:              scoreCount = scoreCount + 1

  22:              MessageBox.Show(String.Format("You got it!!{0}Your score is {1}!!", vbCrLf, scoreCount))

  23:              SetupLetterBox()

  24:              gameClock.Start()

  25:          ElseIf e.Key = Key.Escape Then

  26:              MessageBox.Show(String.Format("Goodbye!{0}Your score is {1}.", vbCrLf, scoreCount))

  27:              MyBase.Close()

  28:          End If

  29:      End Sub

  30:      Private Sub ClockCheck() Handles gameClock.Tick

  31:          letterBoxTop = letterBoxTop + 10

  32:          letterBox.Margin = New Thickness(letterBoxLeft, letterBoxTop, 0, 0)

  33:      End Sub

  34:      Private Function GetLeftMargin() As Integer

  35:          Dim result As Integer = 0

  36:          result = (New Random().Next) Mod CInt(gameBoard.Width - letterBox.Width)

  37:          Return result

  38:      End Function

  39:      Private Function GetLetter() As String

  40:          Dim result As String

  41:          Dim lettersList As String() = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"}

  42:          Dim listIndex As Integer = (New Random().Next) Mod lettersList.Length

  43:          result = lettersList(listIndex).ToString

  44:          Return result

  45:      End Function

  46:  End Class

In the next edition of Live Blogging a XAML project, we will get into a little more of the XAML itself, including getting rid of the messagebox, and adding a little pizzaz!  Until next time...

So, I am writing a game for my son.  It's a Raining Letters type game.  You know, where a letter falls from the top of the screen and the player has to find it and push it on the keyboard before it gets to the bottom of the screen?  Adam has a little hand held game that works this way, but he is ALWAYS on his PC these days so I thought this would be better and a good way for me to learn XAML in the Windows world.  Teach him the ABCs now and teach him the XAML later, right?

Anyway, I started to chat about it on Twitter, and I decided that 1) all of the things I learned would get lost quickly and 2) I would drive everyone absolutely nuts.  So I decided to write an epic blog entry about what I learn.

I am doing this the way I write most of my prototypical applications, and starting very simple and adding in functionality.  I started, then, with a WPF project in VB.  It comes with a window; I added a label in the designer and a timer in the VB file.  On load, I set the Margin of the label to a new thickness with a left of a random number and the top up above the top of the screen.  On the timer click , I add 10 to the top thickness.  When the user clicks the right letter on the keyboard, they win.  Simple.  I'll make it better as I go.

Whoops.  Timer didn't work.  WPF components are compartmentalized.  Didn't know that.  Found a blog entry that helps me out, points me to DispatcherTimer instead.  Gotcha, I can do that.  It is in the System.Windows.Threading class, for which I need to add a reference.  Uses a 'Tick' event rather than an 'Elapsed' event.  that makes me think the windows guys and the Framework guys at Microsoft need to get together and have a beer.

Anyway, I have a working game!  Only does one letter, and not a lot of fun yet, but it's a start.  Here is the XAML:

<Window x:Class="gameBoard"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="The Letters Are Falling!" Height="480" Width="640" Name="gameBoard">
    <Grid>
        <Label Name="letterBox" FontSize="100" HorizontalAlignment="Left" Width="71" Height="110" VerticalAlignment="Top">A</Label>
    </Grid>
</Window>

Here is the VB code:

Class gameBoard
    Public WithEvents gameClock As New DispatcherTimer
    Public letterBoxTop As Integer = 0
    Private Sub gameBoard_Loaded(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles MyBase.Loaded
        letterBoxTop = 0 - letterBox.Height
        letterBox.Margin = New Thickness(100, letterBoxTop, 0, 0)
        gameClock.Interval = New TimeSpan(0, 0, 1)
        gameClock.Start()
    End Sub
    Public Sub LetterPress(ByVal sender As System.Object, ByVal e As System.Windows.Input.KeyEventArgs) Handles MyBase.KeyDown
        If e.Key.ToString = "A" Then
            gameClock.Stop()
            MessageBox.Show("you win!")
        End If
    End Sub
    Public Sub ClockCheck() Handles gameClock.Tick
        letterBoxTop = letterBoxTop + 10
        letterBox.Margin = New Thickness(100, letterBoxTop, 0, 0)
    End Sub
End Class

Now I have a proof of concept, right?  I just need to dig in and get a few features installed.

1. Randomize the letter.
2. Randomize the start position right to left.
3. Make it more fun when you win.
4. Handle it when you lose.

I think I need to work on this tomorrow.  It's a little late and I have a three year old that will be up at 7.  I want to check this into CodePlex.  I have an account there but have never used it.  Wonder how it works.

Go sign in and Create a Project.

The Letters Are Falling! has been created

Congratulations, you've successfully created your project, theLettersAreFalling, on CodePlex.com.

Great!   Now what?  OK, I apparently have 30 days to publish.   Well heck I want to NOW.  Oh, I have a link.  Let's see what's there.

Ah, I need to do a few things.  Edit the homepage.  Wikitext, gotcha.  Done.  Upload the source.  I need to download and install TotriceSVN for Subversion.  Mmmmm .... done.  Give them a few bucks via PayPal.  Reboot.  Grrr ... do that in a little bit.  Freakin windows menu system.

Alright.  Back from reboot.  Right click on the Folder and Import from the TortiseSVN menu.  Put int the URL, username and password CodePlex gave me ... easy.  Wow.  I need to use this for the book code.  Alright.  Moving on.

Pick a license - easy.  Same as the book code - share and share alike!  Oooooh ... not so easy - CC licenses aren't in CodePlex.  I remember reading about this.  Booooooooo.  Damn, now I have to research for a bit.  Let's go with Stallman - he is smarter than me.  Copyleft - the way this stuff should be, right?  I select the GPL and move on.  Done.

Clicking Publish this Project.

Hey, now.  Look at that.

Alright, I am using this for evrything from now on.  Man, are ALL of these repositories this good?  I shoulda been doing this a while ago.  VB for Dummies 2008 code going up ASAP.  Everyone get a codeplex account!  New favorite software.

Anyway, tomorrow we do the RAD rotation, and add features to the POC.  Isn't this fun?

Have a good evening!

I can't make it to PDC this year due to a project commmittment, but if you are there be sure to drop by and say "hi" to Paul Vick.  He is doing a talk on the future of VB this year, and it is sure to be something I should be at ... oh well.  Anyway, I guess I'll just have to live with the video.  This is the description from microsoftpdc.com

Hear language architect Paul Vick and specification lead Lucian Wischik discuss the future direction of the Visual Basic language. Learn about the new capabilities of the next version of the language, including additional LINQ features, syntax simplifications, and a host of other improvements. Also gain insight into possible future features, including meta-programming and scripting.

If you are at PDC, be sure to check him out, cheer loudly, and report back here with the scoop!  Here is the channel 9 link:

http://channel9.msdn.com/pdc2008/TL12/

I'm sure it will be a great presentation!

Sounds like a metaphysical post, but it isn't. In working with an object for which I needed a last change date, I set the DateTime variable value to Nothing in the constructor.

Dim lastReset as DateTime = Nothing 

But when I check for IsNothing() later in the code the check always fails due to the fact that the Nothing value for the DateTime (a value type in .NET) is actually MinValue. To make sure that it wasn't Nothing I would avtually have to compare to MinValue:

If lastReset <> Date.Minvalue Then DoSomething() 

Well, I was sure that .NET 2.0 fixed this with Generics and I was right. This is what happens when you do to much designing and not enough coding, I guess. The new Nullable object type can be Of DateTime, so that this now works:

Dim lastReset as Nullable(Of DateTime) = Nothing 
'… 
If IsNothing(LastReset) Then DoSomething() 

From a pragmatic programming perspective, this isn't a big deal. From a solid code perspective it is a rather large deal. If I say Nothing, I want NOTHING in there. I don't want the MinValue in there. I want Nothing in there. Then I want to see if the value is still nothing later.

So,I need a list of services from a remote machine for an application I am building for Wendys.  I wrote a boatload of System.Management code to do it, liike something like this:

   1:  Public Function ListServices() As Dictionary(Of String, String)

   2:    co = New ConnectionOptions()

   3:    co.Username = My.Settings.Username

   4:    co.Password = My.Settings.Password

   5:    co.Impersonation = ImpersonationLevel.Impersonate

   6:    scope = New ManagementScope("\\" + IPNumber + "\root\cimv2", co)

   7:    Dim result As New Dictionary(Of String, String)

   8:    Dim mc As New ManagementClass("Win32_Service")

   9:    Dim oc As ManagementObjectCollection

  10:    Dim query As New ObjectQuery

  11:    query.QueryString = "SELECT * FROM Win32_Service"

  12:    Dim mos As New ManagementObjectSearcher(scope, query)

  13:    oc = mos.Get

  14:    For Each item As ManagementObject In oc

  15:      result.Add(item.Item("DisplayName"), item.Item("State"))

  16:    Next

  17:    Return result

  18:  End Function 

  19:   

Then what did I learn?  Lo and behold, there is a Tool To Do This.  I hate it when that happens!  Just pass in the WMI namespace and it will generate all the class code you can eat.  (Win32_Battery made me 2800 lines of code).  Check it out here on MSDN.