Question: Good Morning from Venezuela! Hello Matt and Andrea, it feels good to be early for a change. Answer: Great to see you again!

Transcription

1 08:35:42 PDT Question: Good Morning from Venezuela! Hello Matt and Andrea, it feels good to be early for a change. Answer: Great to see you again! 08:50:00 PDT Question: good night here at asia glad to be here again Answer: Thanks for staying up with us! 08:51:43 PDT Question: hi from cayman islands Answer: Hello from Redmond! 08:51:54 PDT Question: Good morning, afternoon and evening to you all! Answer: Thanks for joining David! 08:52:12 PDT Question: HI FROM LA Answer: Good morning! 08:59:25 PDT Question: Good morning from New York City. Answer: Hi Carey! 08:59:33 PDT Jesú Márquez posted: Hola desde Argentina Answer: Bienvenido! Live Event Date: July 12, 2013 Page 1 of 16

2 08:59:38 PDT Question: Hi from Hungary! Answer: Welcome! 08:59:49 PDT Question: Hi from Ireland Answer: Thanks for joining! 09:00:00 PDT Question: Excited to see Laurent and Jaime in action today! Answer: They are stoked too! 09:00:19 PDT Question: Good Morning, Good Afternoon or Good Evening Everyone! Answer: hi davebost! 09:03:47 PDT Question: Hi from Bucharest, Romania & Thank you TEACHERS, MICROSOFT, MVA and Event Support Team for your work to prepare this new lesson! Answer: Great to see you today! 09:04:10 PDT Question: Will there be a video available later on the MVA? Answer: Yes we will post the recorded sessions next week. 09:05:54 PDT Question: When will this class be available on MVA as a streamable post? Unfortunately, I won't be able to watch the whole class today. Answer: It should be available late next week. Live Event Date: July 12, 2013 Page 2 of 16

3 09:13:16 PDT Question: Laurent: Love your surface back Answer: It looks good on camera doesn't it? 09:16:19 PDT Question: I see these are Windows 8 style apps, how applicable will this be for WPF? I'm guessing most of the XAML is the same. Answer: WPF actually has a much larger set of XAML capabilities. With the exception of some Windows 8 controls, everything in Windows 8 XAML will be applicable to WPF XAML (and Windows Phone XAML). 09:18:20 PDT Question: I'm particularly interested in how UI elements can be re-used within an app, and across apps. Answer: UI elements can be reused as a UserControl, where logic and layout can be put into a single control and used repeatedly across your app or in other apps. 09:19:38 PDT Question: Is the height pixels? Answer: For the controls, yes, height is in pixels. You'll see some other height and width for Grids that uses a * syntax, but for controls, the height and width are in pixels. 09:21:21 PDT Question: Is the height pixels? Answer: Correct, the height is a property inherited from FrameworkElement and is in pixels. 09:23:20 PDT - for a fully re-usable UI element (that can be templatable/styleable) you would follow the custom control model ideally to encapsulate all UI/logic in its on component Answer: Live Event Date: July 12, 2013 Page 3 of 16

4 09:24:57 PDT Question: Nice 'retro' theme to the Visual Studio 2013 preview. I thought it was vs2010 for a moment... Answer: 09:29:16 PDT Question: how develope for different size of windows in xaml? Answer: The biggest aid to do dynamic sizing in XAML is to use the Grid control, which allows for dynamic and relative sizing. Windows 8/Store also includes controls that resize appropriately by default (such as the GridView) 09:32:00 PDT Question: What os the difference between HTML 5 new capabilities and XAML? Answer: That's a really hard question to answer because they're very different models. Both models have a wealth of features and functionality but and have a lot of differences in implementation. Is there anything specifically you are looking for? 09:42:07 PDT Question: Please, tell me about Multitouch events,, how can I can drive into xaml? show me a sample please. Thanks Answer: There are a huge number of samples here. There are some multi-touch samples in there 09:46:43 PDT Question: Helllo whta is this event MVA Code? Answer: Check in the FAQ, but it's XAMLJS 09:50:29 PDT Question: Which is more easy and flexible HTML or XAML? Live Event Date: July 12, 2013 Page 4 of 16

5 Answer: This is a popular question, but potentially not the right question. Both are very powerful, both are very flexible. HTML probably has a faster learning curve, though, because XAML has more potential (i.e., it's more extensible). Depending on what type of solution you're trying to build, it may be easier to build one type of app in HTML5, but it will also be easier to build certain types of apps in XAML. 09:51:01 PDT Question: Is XAML and HTML5 mutually exclusive? Answer: There are scenarios where you can do XAML and HTML5 jointly using a WebView control. And you can build a Silverlight app that puts XAML in an HTML page. 09:52:43 PDT Question: Is WP8 XAML built on top of WinPRT like W8 XAML on WinRT or on Silverlight? Answer: WP8 XAML is built on top of WinRT. The model isn't very different from the WP7 model build on Silverlight, but the underlying kernel is totally new. 09:52:45 PDT Question: As to what is simpler, I would expect this to also relate to the individual's current skillset. Answer: Another great point. 09:53:11 PDT Question: Can MS Visual Studio Express be installed and run without issues on Windows 8.1 Preview? Answer: Hi Dave, you are able to install VS2012 Express and VS2013 Preview Express side by side on Windows 8.1 Preview 09:53:50 PDT Question: Can we embed other languages in XAML like HTML5? Answer: Most XAML-based platforms support a WebControl that can host HTML. This includes Windows Store, WPF, and Windows Phone. Live Event Date: July 12, 2013 Page 5 of 16

6 09:54:23 PDT Question: I think both are viable solution, IMHO it depends more on team skills than app type. Answer: Another great point. 09:55:14 PDT Question: DirectX, XAML or HTML? This session will cover the strengths of the different Windows 8.1 presentation technologies and provide guidance on when to use each, or to mix and match the different technologies. Answer: This is a great resource for those of you wrestling w/ this question. 09:56:36 PDT Question: what is a partial class? Answer: Great question Rama. A partial class is a class that is split into multiple source files. When compiled, it is compiled as a single class. More info here: 09:57:28 PDT Question: I'm doing both WP8 and WinRT development. So the ability to reuse xaml custom controls is important Answer: This is not a recommended practice. It can be done with some limited functionality (I've done it with forms and simple controls) but the styles and layouts of WP8 and Windows 8 are designed specifically for the platforms, making it hard to share custom XAML controls. 10:07:20 PDT Question: if I develop for win phone 7, it run right in win phone 8? Answer: Yes, although you will be missing out on a lot of features available in Windows Phone 8, including the high resolution rendering 10:15:32 PDT Question: the links are interesting in the video slide show; can those be placed in the chat box so I can copy them and save to a folder? Live Event Date: July 12, 2013 Page 6 of 16

7 Answer: We are trying to figure out a solution for that. You can download the slides from the FAQ tab and they will have the links. We will have the presentation slides available shortly. The break slides are there now. 10:17:09 PDT Question: there is a "Build Apps for Both Windows 8 and Windows Phone 8 Jump Start" cross platform delepoment on MVA Answer: It's a good one! Here's the 10:24:58 posted: I'm stuck at work. Hoping this will be available as a video soon. Answer: We usually get the recordings posted in about one week. 10:29:46 PDT Question: Pro tip: (did I really just type that?) Wait for the videos to be posted at channel 9. Then you can download them and watch them with a variable speed offline media player. Answer: You are now also able to download the files from the MVA site as well. 10:32:13 PDT - do you have a live in-studio audience? Answer: Just me, Barry and Danny 10:41:16 PDT Question: A shout out to Matt, Barry and Danny! Answer: Hey Daren! 10:43:24 PDT Calder do you have the link to download the files? Live Event Date: July 12, 2013 Page 7 of 16

8 Answer: To download our on demand videos, right? If you click to play the video from a course page like this one app-development it will open an embedded video player The download links are just below the player. 10:48:09 PDT Question: Any LayoutTransform available for WinRT XAML (i.e. Windows Store App)? Answer: There are RenderTransform (including Project) in WinRT. I've found these sufficient, but they are different than the LayoutTransform. 10:49:49 PDT Question: In Visual Studio we can use any other language besides XAML Correct? we can o Java and CSS besides HTLM 5 Answer: Visual Studio has great support for JavaScript, CSS, HTML. It does not support Java as far as I know. 10:51:49 PDT Question: All the transforming and layout elements are accessible in code to make them dynamic? Answer: Yes. You can change transform information through code. I believe you need to assign a new transform group each time. Here's an example US/a0d473fe aa24-1ea d3/how-to-rendertransform-in-code-behind-c 10:56:00 PDT Question: XAML spy is not a free utility correct? Answer: There is a 21 day free trial but then you must purchase 11:04:48 PDT Question: Resources seem to be style sheets for XAML Answer: That is usually how I frame the concept of resources in XAML. The big difference is that you can create anything as a resource including business logic-based objects. Live Event Date: July 12, 2013 Page 8 of 16

9 11:05:47 PDT Question: Pls also add the following: are there specific differences between Isolated Storage in WP7 vs WP8? I am having difficulty saving content larger than 4K in WP8 but no issues in WP7 Answer: Starting with Windows Phone 8, we're trying to move away from isolated storage and toward the StorageFolder/StorageFile model that we support in Windows 8 Store. 11:18:07 PDT Question: what s the difference between xaml and wpf? Answer: WPF is a framework that includes XAML and either C# or VB to build applications. WPF apps can run on virtually all forms of Windows, from XP up (but not WinRT). XAML is a UI syntax that drives the UI in WPF, Silverlight, Windows Store or Windows Phone apps. So XAML is a part of WPF, but also a part of other non-wpf technologies. 11:45:01 PDT Question: Here is a very good collection of XAML and WPF based articles from Josh Smith, a XAML and WPF guru on codeproject: Answer: Sharing 11:49:08 PDT Question: If you want to have a button in 2 columns, you use ColumnSpan as they said but you define your button in which column the first or the second? Answer: Hi Ludo, you define the element in the first column. 11:58:04 PDT Question: Is designing in blend realtime translated to visual studio and vice versa? Answer: Yes. You'll need to reload the file in VS after editing it in Blend. 12:01:57 PDT Question: Isn't the UI design in Visual Studio exactly the same as Blend? Live Event Date: July 12, 2013 Page 9 of 16

10 Answer: The rendering engine and many of the tools are the same in VS as in Blend, but VS is missing things like the animation editing capabilities, the sample data options. I've also found VS to be slower and it seems to be missing some of the template edit options (specifically the visual state designer). Although it could be that I just haven't found that in VS. It may be there. 12:14:53 PDT Question: hello. i have the basic idea of app development in widows 8 but i have always used built in UI templates. SO can i make my own app design and wont it conflict with the rules of designing for windows 8 app. Answer: Hi kam, you can start with the blank app and use your own design, and I would actually encourage that. Visit to learn more about the design guidelines and see some design examples for Windows Store Apps 12:19:20 PDT Question: by after effects i mean that if we are designing a game and in that we click on an object which collapses when clicked, instead of collapse, can we add some firework or lightning effects? Answer: What I usually do is have the click event start an animation and then tie the end of the animation to collapse the element. 12:19:55 PDT Question: I should be able to us PCL with Windows 8.1 Store App with Windows Phone 8 with VS2013? Answer: Correct, With VS2013 you can create a PCL that will target Windows 8.1 and Windows Phone 8, or even Windows 8.0/8.1 and Windows Phone 8 13:03:53 PDT Question: what is PCL? Answer: Hi Andy, PCL stands for Portable Class Library, and it allows you to encapsulate code that can be referenced by multiple project types, in this case Windows Store App and Windows Phone App. See for more info. Live Event Date: July 12, 2013 Page 10 of 16

11 13:07:12 PDT Question: Description of windows phone 8 with visual studio 2013 and windows 8.1, there are many features. In addition to advantages and disadvantages of windows 8.1 and VS 2013 Answer: The big disadvantage of 8.1 is that it is not publically released yet. When it does get released, we should see very quick conversion from current 8.0 users. As for the advantages, check out Tim Heuer's Build talk on what is new in XAML for Windows :11:17 PDT Question: why would i select xaml/c# over html/js when developing my application? Answer: You should choose whatever framework is a best fit for your skills and your application. I know that sounds like an evasive answer, so I'll give a little more detail. XAML and C# really shine in highperformance responsive applications, especially when working across platforms (WPF/Windows 8 Store/ Windows Phone). HTML/JS may give you more portable across more platforms (Android, Web, ios) but from what I've seen there is a performance sacrifice. But if you know HTML/JS better, that may be the best way to go. 13:15:59 PDT Question: So what framework should I prefer? other than xaml? Answer: It always depends on what you want to do. If you want to move easily between the web and app development, maybe HTML5 is your best option. You'll probably see a performance hit, but you'll be working in the same technology the whole time. With that in mind, maybe consider PhoneGap, which is a framework for making that transition a little easier. If you're doing games, consider using Unity, which is also a great cross-device option that is supported on ios, Android, and Windows devices. 13:20:44 PDT Question: but if my target is windows 8 store/phone, writing in html/js won't be a cross platform, is it? Answer: Yes and no. If you're using WinJS, there is no comparable WinJS in Windows Phone so you're going to run into some cross-platform problems. However Win8 and WinPhone8 are both running IE10 so you'll see a good amount of cross-over in your work. As an example, check out this series on building a cross-platform HTML5 game for the web, for Windows 8 and for Windows Phone 8 Live Event Date: July 12, 2013 Page 11 of 16

12 14:38:12 PDT Question: Q: What's the best way to binding a collection to a listview and the selected value? Answer: Hi there, the best way is to bind an ObservableCollection to the ItemsSource property of the listview. If you want to bind to the value od the selected value, you can bind to the SelectedItem property of the listview. 14:49:23 PDT Question: We have problem using INotifyPropertyChanged when a property is changed in a separate thread (not UI thread). If throws an error when a property change in a non-ui thread tries to notify UI elements. How do we handle this? Answer: The best way to do this is to switch to the UI thread using a dispatcher. In Windows Phone this would be: Deployment.Current.Dispatcher.BeginInvoke(() => { Do your property change in here }; 14:51:22 PDT Question: How to handel this with 2 datacontexts on one page? Answer: Hi Dirk, you can have two sibling controls/elements that have DataContext set to differently (for instance: two different datamodel class). 15:09:48 PDT Question: What is the difference between StaticResource and DynamicResource? Answer: Static resource is a resource that you have defined in project for instance, a Style that defines a color brush for color blue, then you can use that color brush (Static resource) and use it at multiple places in your application and maybe set color of various pages using the predefined brush. Then there is data that you can set at runtime, for instance get weather from some api on the web and bind the temperature to a element 15:31:05 PDT Question: will we be able to resize windows in 8.1? Answer: Yes. There is variable sizing of windows in 8.1 Live Event Date: July 12, 2013 Page 12 of 16

13 15:36:53 PDT Question: Is it possible in Win8.1 with multi screens running desktop on one screen and Win 8.1 on the secound screen (with the tiles) Answer: It is possible in 8.0. I'm currently running Windows 8.0 Where I can have a Store experience on one screen and a desktop experience on another screen. 15:38:45 PDT Question: I am building a Win 8 phone app. It has been suggested that I use VS Express rather than VS 2012 because it apparently works better with phone and is easier. Is this accurate and do I surrender some functionality by doing this? Answer: VS Express is a pretty powerful tool, but I prefer VS 2012 because I rely on Team Studio so much. IF you don't use Team Studio (maybe you're doing pure Git for source control) or you don't need the unit testing elements of VS2012, VS Express is a perfectly good solution. 16:00:44 PDT Question: I am not following the discussion of double vs. object in the context of animation. Are they talking about data types? Answer: With an object key frame, you can't "ease" the property, with a double animation you can. Think of it this way... there are lots of in-between positions between 1 and 100 (a double animation) so we can set that property to any gradation between those two values. But there are no in between states between true and false. So an object animation doesn't ease or operate under any level of easing. It just changes the property from A to B. 16:06:57 PDT Question: can these animations easily converted to SVG for playing on HTML5 canvas?? Answer: There is nothing that I know of. It would be a pretty big chore since HTML canvas is x,y coordinate based and XAML animations use a much more sophisticated layout structure. 16:10:13 PDT Question: Where can I download the Windows SDK Samples? Answer: Hi David, you can find samples here: 8-Modern-Style-App-Samples Live Event Date: July 12, 2013 Page 13 of 16

14 16:10:21 PDT Question: Where can I download the Windows SDK Samples? Answer: Hi David, Windows Store SDK Samples can be found here: 16:19:42 PDT Question: I would be curious to know some of the online design resources Laurent and Jamie use to learn about the visual effects. Answer: -- we will post the resources online early next week.. please look for it on 16:20:17 PDT Question: Has support for silverlight improved with the blend that ships in 2013? I find blend editing silverlight xaml mainly ok but sometimes throws errors when none exists. Just shutting down blend and reopening the file can sort the issue, does anyone else see this? Answer: Andy, yes. support is better in VS :21:13 PDT Question: Is there a reference where we can see what elements are usable in what platform? Answer: Jim, we did not have time for that... what would you like to see? maybe we can do a post... 16:25:19 PDT Question: like the transform was not usable in windows store apps... but what is usable where? Maybe a list on what is usable on what platform Answer: Hi Jim, there is a XAML control comparison for Windows 8 and WP8 link]( hope it helps 16:30:22 PDT Question: Question for Laurent: Is there a native MVVM framework in.net 4.5 or we need to use 3th party framework like in.net 4.0? Live Event Date: July 12, 2013 Page 14 of 16

15 Answer: hi, Microsoft does not have any native MVVM frameworks. youneed to use 3rd party frameworks.. 16:32:08 PDT Question: When should I implement ICustomPropertyProvider instead of INotifyPropertyChanged or DependencyProperty for data binding and change notifications. What's the difference? Answer: DependencyProperty is for UI objects... you implement INPC when it is not a UI object... 16:32:39 PDT are you guys going over how to optimize all of the app layers? i.e,, UI, functions, features, etc Answer: Not enough time today.. what kind of info are you after? 16:34:47 PDT Question: Is XAML (WinRT) a formal subset of both WPF and Silverlight (could I compile something written in XAML in both environments unchanged, aside from reference changes))? What is the future of WPF & Silverlight? Answer: Hi, no... XAML in Windows Store is not a subset.. They all share a core, but each platform has extra features that are different from the other ones... none is a subset.. 16:35:19 PDT Question: Do we have any data around How many app uses html v/s How many app uses XAML among all apps published till now? Answer: We do not have that data here.. sorry! 16:36:27 PDT Question: How do we RaisePropertyChanged event in a Task (separate thread)? Answer: If you aren't on the UI thread, you can use Deployment.Current.Dispatcher.BeginInvoke( ()=> { // Update here }; for Windows Phone and I believe Dispatcher.RunAsync for Windows 8. Live Event Date: July 12, 2013 Page 15 of 16

16 16:38:17 PDT Question: this is how I like it - they shifted to the next gear Answer: 16:40:03 PDT Question: Are there a migration path for larger winform apps? Answer: Andre, moving from Winforms to WPF is not trivial... it is a re-write of your UI... your business logic can be reused, but not your UI... there is no migration paths since the UI is a re-write.. 16:43:59 PDT You can put that code into a method and use an Func<T> or Action to be executed inside the method. Answer: I believe so. I don't usually do things that way, but I've seen it done. 16:56:41 PDT Question: Do you think they will have a DatePicker for Windows 8 app in XAML very soon? Answer: The date picker was added as a XAML control to the Windows 8.1 XAML set. 16:57:28 PDT Question: What is your opinion about using additional viewmodels for the list items? Answer: This is a totally viable model. In fact, it matches very well with what the Hulu team did when building their MVVM apps for Windows and Windows Phone. 17:04:14 PDT Question: What is IOC???????????? Answer: IOC stands for Inversion of control. IT's a somewhat complex subject, but LAurent has a great article on it here Live Event Date: July 12, 2013 Page 16 of 16