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  • Google Developers SXSW LEGO Rumble

    Google Developers SXSW LEGO Rumble The Google Developers LEGO® MINDSTORMS® rumble returns to SXSW this year with even more epic proportions. After teams spend the day building LEGO race bots controlled by Android, the bots will compete in the ultimate showdown to determine the victors. We'll be broadcasting live the main event with multiple camera angles, slow-mo replay, interviews with the teams, and commentary from judges and attendees to give you an insider pass to all the action. You won't want to miss this showdown. More information can be found at: www.google.com From: GoogleDevelopers Views: 11238 182 ratings Time: 01:37:01 More in Entertainment

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  • Google I/O 2010 - Fireside chat with the App Engine team

    Google I/O 2010 - Fireside chat with the App Engine team Google I/O 2010 - Fireside chat with the App Engine team Fireside Chats, App Engine Sean Lynch, Kevin Gibbs, Don Schwarz, Matthew Blain, Guido van Rossum, Max Ross, Brett Slatkin It's been an busy year for the App Engine team with lots of new features and lots of new developers. Come tell us about what you've loved and what still bugs you. With several members of the App Engine team on deck, you'll get the answers to your questions straight from the source. For all I/O 2010 sessions, please go to code.google.com From: GoogleDevelopers Views: 6 0 ratings Time: 57:59 More in Science & Technology

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  • Task-It Webinar - Source Code

    Last week I presented a webinar called "Building a real-world application with RadControls for Silverlight 4". For those that didn't get to see the webinar, you can view it here: Building a read-world application with RadControls for Silverlight 4 Since the webinar I've received several requests asking if I could post the source code for the simple application I showed demonstrating some of the techniques used in the development of Task-It, such as MVVM, Commands and Internationalization. This source code is now available for downloadhere. After downloading the source: Extract it to the location of your choice on your hard-drive Open the solution Right-click ModuleProject.Web and selecte 'Set as StartUp Project'. Right-click ProjectTestPage.aspx and selected 'Set as Start Page' Create a database in SQL Server called WebinarProject. Navigate to the Database folder under the WebinarProject directory and run the .sql script against your WebinarProject database. The last two steps are necessary only for the Tasks page to work properly (using WCF RIA Services). Now some notes about each page: Code-behind This is not the way I recommend coding a line-of-business application in Silverlight, but simply wanted to show how the code-behind approach would look. Command This page introduces MVVM and Commands. You'll notice in the XAML that the Command property of theRadMenuItem and the Button are both bound to a SaveCommand. That comes from the view model. If you look in the code- behind of the user control you'll see that an instance of a CommandViewModel is instantiated and set as the DataContext of the UserControl.There is also a listener for the view model's SaveCompleted event. When this is fired, it tells the view (UserControl) to display the MessageBox. Internationalization This sample is similar to the previous one, but instead of using hard-coded strings in the UI, the strings are obtained via binding toview model properties. The view model gets the strings from the .resx files (Strings.resx or Strings.de.resx) under Assets/Resources. If you uncomment the call to ShowGerman() in App.xaml.cs's Application_Startup method and re-run the application, you will see the UI in German. Note that this code, which sets the CurrentCulture and CurrentUICulture on the current thread to "de" (German) is for testing purposes only. RadWindow Once again, very similar to the previous example.The difference is that we are now using a RadWindow to display the 'Saved' message instead of a MessageBox. The advantage here is that we do not have to hold on to a reference to the view model in our code behind so that we can get the 'Saved' message from it. The RadWindow's DataContext is now also bound to the view model, so within its XAML we can bind directly to properties in the view model. Much nicer, and cleaner. One other thing I introduced in this example is the use of spacer Rectangles. Rather than setting a width and/or height on the rectangles for spacing, I am now referencing a style in my ResourceDictionary called StandardSpacerStyle. I like doing this better than using margins or padding because now I have a reusable way to create space between elements, the Rectangle does not show (because I have not set its Fill color), and I can change my spacing throughout the user interface in one place if I'd like. Tasks This page is quite a bit different than the other four. It is a very simple, stripped-down version of the Tasks page in the Task-It application. The Tasks.xaml UserControl has a ContentControl, and the Content of that control is set based on whether we are looking at the list of tasks or editing a task. So it displays one of two child UserControls, which are called List and Details. List has the RadGridView, Details has the form. In the code-behind of the Tasks UserControl I am once again setting its DataContext to a view model class. The nice thing is, whichever child UserControl is being displayed (List or Details) inherits its DataContext from its parent control (Tasks), so I do not have to explicitly set it. The List UserControl simply displays a RadGridView whose ItemsSource is bound to a property in the view model called Tasks, and its SelectedItem property is bound to a property in the view model called SelectedItem. The SelectedItem binding must be TwoWay so that the view is notified when the SelectedItem changes in the view model, and the view model is notified when something changes in the view (like when a user changes the Name and/or DueDate in the form). You'll also notice that the form's TextBox and RadDatePicker are also TwoWay bound to the SelectedItem property in the view model. You can experiment with the binding by removing TwoWay and see how changes in the form do not show up in the RadGridView. So here we have an example of two different views (List and Details) that are both bound to the same view model...and actually, so is the Tasks UserControl, so it is really three views. WCF RIA Services By the way, I am using WCF RIA Services to retrieve data for the RadGridView and save the data when the user clicks the Save button in the form. I created a really simple ADO.NET Entity Data Model in WebinarProject.Web called DataModel.edmx. I also created a simple Domain Data Service called DataService that has methods for retrieving data, inserting, updating and deleting. However I am only using the retrieval and update methods in this sample. Note that I do not currently have any validation in place on the form, as I wanted to keep the sample as simple as possible. Wrap up Technically, I should move the calls to WCF RIA Services out of the view model and put them into a separate layer, but this works for now, and that is a topic for another day! Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Mars Mania and the Google Maps APIs!

    Mars Mania and the Google Maps APIs! Interested in learning how to use the Google Maps API and WebGL to create a dynamic terrain lighting map of the surface of Mars? Or how about using the Street View API and a bit of ImageMagick to view the high resolution panoramic images from the Curiosity Rover? Since Curiosity's touchdown, Brendan Kenny and Paul Saxman have been infected with a bit of Mars Mania. Stop by this week's Google Maps Developers Office Hours to see how they've been seeking therapy through productive programming. From: GoogleDevelopers Views: 1146 28 ratings Time: 34:15 More in Science & Technology

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  • GDC 2012: Best practices in developing a web game

    GDC 2012: Best practices in developing a web game (Pre-recorded GDC content) There's a new wave of console/pc/mobile game developers moving to the web looking to take advantage of the massive user base, along side of the powerful social graphs available there. The web as a platform is a very different technology stack than consoles / mobile, and as such, requires different development processes. This talk is targeted towards game developers who are looking to understand more about the development processes for web development including where to host your assets, proper techniques in caching to the persistant file store; dealing with sessions, storing user state, user login, game state storage, social graph integration, localization, audio, rendering, hardware detection and testing / distribution. If you're interested in developing a web game, you need to attend this talk! Speaker: Colt McAnlis From: GoogleDevelopers Views: 5149 131 ratings Time: 01:03:52 More in Science & Technology

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  • Keyboard Function Keys Do Not Work

    - by Anthony Burman
    I use the Microsoft Natural MultiMedia Keyboard 1.0A. The keyboard is not a wireless board. The Escape button and the function keys have never worked. I am currently running on 10.10. On previous incarnations the keys never worked either. However a recent journey through all the Microsoft options in System Preference Keyboard Layouts suggested that the Escape button could be functional. The current setting is Generic 105-key (Intl) PC. Can I find out whether the keys can be made to work or not? Of the top buttons, nothing happens when I press My Documents; a small red cross appears at the top right of the screen when I press My Pictures and the Media, Mail and Web/Home buttons work just fine. Thanks, Anthony.

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  • Mobile Chrome Office Hours: Tools for Mobile Web Development

    Mobile Chrome Office Hours: Tools for Mobile Web Development Ask and vote for questions at: goo.gl Are you building for the mobile web? Are you looking for easier and better tools to help you create great experiences? Join Boris Smus and Pete LePage as they show you some of the many tools available to mobile web developers. We'll take a look Chrome's remote debugging features, some of the emulation tools available to you within Chrome and take a deep dive into some of the advanced use cases of these tools to help you build for the mobile web. From: GoogleDevelopers Views: 1432 60 ratings Time: 42:16 More in Science & Technology

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  • Google I/O 2012 - Empower Local Shopping Through Google Shopping

    Google I/O 2012 - Empower Local Shopping Through Google Shopping Thomas Kotzmann, Claudia Ciorascu More and more of consumers research online first before going to a local store to purchase a product and we can expect this trend to continue to rise. How can merchants and retailers take advantage of this trend? Local shopping enables merchants to declare product price and availability per local store. In this session, we will show you how to set up and manage local shopping accounts in the Google Merchant Center and how to use the Content API to upload local products and do live inventory updates. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 100 1 ratings Time: 49:01 More in Science & Technology

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  • Behaviour Driven Maturity Model

    - by Michael Stephenson
    Originally posted on: http://geekswithblogs.net/michaelstephenson/archive/2013/07/02/153326.aspxFor anyone who is interested I have written a small paper about the theory behind the BizTalk Maturity Assessment using a generic framework I have called the "Behaviour Driven Maturity Model" and then how it could be applied to the assessment of other subjects.The paper is on the following link:http://btsmaturity.blob.core.windows.net/behaviour-driven-model/Behaviour%20Based%20Maturity%20Model%20-%20Introduction.pdfIf you would like to create a model for a different subject area based on the details of this paper then I would encourage this as much as possible, all I ask is the following:1. Let us know your doing it so we can help tell people about each others activities2. Make it free to the community3. Reference back to BizTalkMaturity.com as the source of your model

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  • CLR via C# 3rd Edition is out

    - by Abhijeet Patel
    Time for some book news update. CLR via C#, 3rd Edition seems to have been out for a little while now. The book was released in early Feb this year, and needless to say my copy is on it’s way. I can barely wait to dig in and chew on the goodies that one of the best technical authors and software professionals I respect has in store. The 2nd edition of the book was an absolute treat and this edition promises to be no less. Here is a brief description of what’s new and updated from the 2nd edition. Part I – CLR Basics Chapter 1-The CLR’s Execution Model Added about discussion about C#’s /optimize and /debug switches and how they relate to each other. Chapter 2-Building, Packaging, Deploying, and Administering Applications and Types Improved discussion about Win32 manifest information and version resource information. Chapter 3-Shared Assemblies and Strongly Named Assemblies Added discussion of TypeForwardedToAttribute and TypeForwardedFromAttribute. Part II – Designing Types Chapter 4-Type Fundamentals No new topics. Chapter 5-Primitive, Reference, and Value Types Enhanced discussion of checked and unchecked code and added discussion of new BigInteger type. Also added discussion of C# 4.0’s dynamic primitive type. Chapter 6-Type and Member Basics No new topics. Chapter 7-Constants and Fields No new topics. Chapter 8-Methods Added discussion of extension methods and partial methods. Chapter 9-Parameters Added discussion of optional/named parameters and implicitly-typed local variables. Chapter 10-Properties Added discussion of automatically-implemented properties, properties and the Visual Studio debugger, object and collection initializers, anonymous types, the System.Tuple type and the ExpandoObject type. Chapter 11-Events Added discussion of events and thread-safety as well as showing a cool extension method to simplify the raising of an event. Chapter 12-Generics Added discussion of delegate and interface generic type argument variance. Chapter 13-Interfaces No new topics. Part III – Essential Types Chapter 14-Chars, Strings, and Working with Text No new topics. Chapter 15-Enums Added coverage of new Enum and Type methods to access enumerated type instances. Chapter 16-Arrays Added new section on initializing array elements. Chapter 17-Delegates Added discussion of using generic delegates to avoid defining new delegate types. Also added discussion of lambda expressions. Chapter 18-Attributes No new topics. Chapter 19-Nullable Value Types Added discussion on performance. Part IV – CLR Facilities Chapter 20-Exception Handling and State Management This chapter has been completely rewritten. It is now about exception handling and state management. It includes discussions of code contracts and constrained execution regions (CERs). It also includes a new section on trade-offs between writing productive code and reliable code. Chapter 21-Automatic Memory Management Added discussion of C#’s fixed state and how it works to pin objects in the heap. Rewrote the code for weak delegates so you can use them with any class that exposes an event (the class doesn’t have to support weak delegates itself). Added discussion on the new ConditionalWeakTable class, GC Collection modes, Full GC notifications, garbage collection modes and latency modes. I also include a new sample showing how your application can receive notifications whenever Generation 0 or 2 collections occur. Chapter 22-CLR Hosting and AppDomains Added discussion of side-by-side support allowing multiple CLRs to be loaded in a single process. Added section on the performance of using MarshalByRefObject-derived types. Substantially rewrote the section on cross-AppDomain communication. Added section on AppDomain Monitoring and first chance exception notifications. Updated the section on the AppDomainManager class. Chapter 23-Assembly Loading and Reflection Added section on how to deploy a single file with dependent assemblies embedded inside it. Added section comparing reflection invoke vs bind/invoke vs bind/create delegate/invoke vs C#’s dynamic type. Chapter 24-Runtime Serialization This is a whole new chapter that was not in the 2nd Edition. Part V – Threading Chapter 25-Threading Basics Whole new chapter motivating why Windows supports threads, thread overhead, CPU trends, NUMA Architectures, the relationship between CLR threads and Windows threads, the Thread class, reasons to use threads, thread scheduling and priorities, foreground thread vs background threads. Chapter 26-Performing Compute-Bound Asynchronous Operations Whole new chapter explaining the CLR’s thread pool. This chapter covers all the new .NET 4.0 constructs including cooperative cancelation, Tasks, the aralle class, parallel language integrated query, timers, how the thread pool manages its threads, cache lines and false sharing. Chapter 27-Performing I/O-Bound Asynchronous Operations Whole new chapter explaining how Windows performs synchronous and asynchronous I/O operations. Then, I go into the CLR’s Asynchronous Programming Model, my AsyncEnumerator class, the APM and exceptions, Applications and their threading models, implementing a service asynchronously, the APM and Compute-bound operations, APM considerations, I/O request priorities, converting the APM to a Task, the event-based Asynchronous Pattern, programming model soup. Chapter 28-Primitive Thread Synchronization Constructs Whole new chapter discusses class libraries and thread safety, primitive user-mode, kernel-mode constructs, and data alignment. Chapter 29-Hybrid Thread Synchronization Constructs Whole new chapter discussion various hybrid constructs such as ManualResetEventSlim, SemaphoreSlim, CountdownEvent, Barrier, ReaderWriterLock(Slim), OneManyResourceLock, Monitor, 3 ways to solve the double-check locking technique, .NET 4.0’s Lazy and LazyInitializer classes, the condition variable pattern, .NET 4.0’s concurrent collection classes, the ReaderWriterGate and SyncGate classes.

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  • Is Information Technology really Engineering?

    - by RPK
    While travelling I met a mathematician who was sitting near me. In a discussion he said: "...there is nothing like engineering in IT or rather programming". A true engineering is what Architecture is, what Electrical and Mechanical is. It made me think and I was puzzled. A percent of my brain agreed also because in Indian Army, there is no subject like Computer Engineering in the Engineering Corps. They don't consider programming as engineering. This is what I heard few years back, I don't know what Indian Army thinks now. What are your views?

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  • Make The Web Fast - The HAR Show: Capturing and Analyzing performance data with HTTP Archive format

    Make The Web Fast - The HAR Show: Capturing and Analyzing performance data with HTTP Archive format Need a flexible format to record, export, and analyze network performance data? Well, that's exactly what the HTTP Archive format (HAR) is designed to do! Even better, did you know that Chrome DevTools supports it? In this episode we'll take a deep dive into the format (as you'll see, its very simple), and explore the many different ways it can help you capture and analyze your sites performance. Join +Ilya Grigorik and +Peter Lubbers to find out how to capture HAR network traces in Chrome, visualize the data via an online tool, share the reports with your clients and coworkers, automate the logging and capture of HAR data for your build scripts, and even adapt it to server-side analysis use cases! Yes, a rapid fire session of awesome demos - see you there. From: GoogleDevelopers Views: 0 6 ratings Time: 00:00 More in Science & Technology

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  • Oracle SQL Developer v3.2.1 Now Available

    - by thatjeffsmith
    Oracle SQL Developer version 3.2.1 is now available. I recommend that everyone now upgrade to this release. It features more than 200 bug fixes, tweaks, and polish applied to the 3.2 edition. The high profile bug fixes submitted by customers and users on our forums are listed in all their glory for your review. I want to highlight a few of the changes though, as I recognize many of you lack the time and/or patience to ‘read the docs.’ That would include me, which is why I enjoy writing these kinds of blog posts. I’m lazy – just like you! No more artificial line breaks between CREATE OR REPLACE and your PL/SQL In versions 3.2 and older, when you pull up your stored procedural objects in our editor, you would see a line break inserted between the CREATE OR REPLACE and then the body of your code. In version 3.2.1, we have removed the line break. 3.1 3.2.1 Trivia Did You Know? The database doesn’t store the ‘CREATE’ or ‘CREATE OR REPLACE’ bit of your PL/SQL code in the database. If we look at the USER_SOURCE view, we can see that the code begins with the object name. So the CREATE OR REPLACE bit is ‘artificial’ The intent is to give you the code necessary to recreate your object – and have it ‘compile’ into the database. We pretty much HAVE to add the ‘CREATE OR REPLACE.’ From now on it will appear inline with the first line of your code. Exporting Tables & Views When exporting data from your tables or views, previous versions of SQL Developer presented a 3 step wizard. It allows you to choose your columns and apply data filters for what is exported. This was kind of redundant. The grids already allowed you to select your columns and apply filters. Wouldn’t it be more intuitive AND efficient to just make the grids behave in a What You See Is What You Get (WYSIWYG) fashion? In version 3.2.1, that is exactly what will happen. The wizard now only has two steps and the grid will export the data and columns as defined in the visible grid. Let the grid properties define what is actually exported! And here is what is pasted into my worksheet: "BREWERY"|"CITY" "3 Brewers Restaurant Micro-Brewery"|"Toronto" "Amsterdam Brewing Co."|"Toronto" "Ball Brewing Company Ltd."|"Toronto" "Big Ram Brewing Company"|"Toronto" "Black Creek Historic Brewery"|"Toronto" "Black Oak Brewing"|"Toronto" "C'est What?"|"Toronto" "Cool Beer Brewing Company"|"Toronto" "Denison's Brewing"|"Toronto" "Duggan's Brewery"|"Toronto" "Feathers"|"Toronto" "Fermentations! - Danforth"|"Toronto" "Fermentations! - Mount Pleasant"|"Toronto" "Granite Brewery & Restaurant"|"Toronto" "Labatt's Breweries of Canada"|"Toronto" "Mill Street Brew Pub"|"Toronto" "Mill Street Brewery"|"Toronto" "Molson Breweries of Canada"|"Toronto" "Molson Brewery at Air Canada Centre"|"Toronto" "Pioneer Brewery Ltd."|"Toronto" "Post-Production Bistro"|"Toronto" "Rotterdam Brewing"|"Toronto" "Steam Whistle Brewing"|"Toronto" "Strand Brasserie"|"Toronto" "Upper Canada Brewing"|"Toronto" JUST what I wanted And One Last Thing Speaking of export, sometimes I want to send data to Excel. And sometimes I want to send multiple objects to Excel – to a single Excel file that is. In version 3.2.1 you can now do that. Let’s export the bulk of the HR schema to Excel, with each table going to it’s own workbook in the same worksheet. Select many tables, put them in in a single Excel worksheet If you try this in previous versions of SQL Developer it will just write the first table to the Excel file. This is one of the bugs we addressed in v3.2.1. Here is what the output Excel file looks like now: Many tables - Many workbooks in an Excel Worksheet I have a sneaky suspicion that this will be a frequently used feature going forward. Excel seems to be the cornerstone of many of our popular features. Imagine that!

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  • Clear Complete Instructions to Dual-Boot 12.04 on OSX Lion

    - by BCZ
    Honestly, google-surfing this question leads to so many half-answers and multi-part communications that it is both scary and frustrating to try to navigate them. The question here is simple: What are the clear and complete step-by-step instructions that you used to dual-boot 12.04 on your OSX Lion (entrapped) Apple computer. Did you use rEFIt, rEFIind, a special .iso of 12.04? What? Obviously, there is a preference for safer, easier, and more reversible methods. I can probably assure that the best answer will get plenty of views.

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  • GDC 2012: Porting your game to NaCl

    GDC 2012: Porting your game to NaCl (Pre-recorded GDC content) This talk will cover the nuances of porting your existing C++ game to Native Client. We'll talk about the application specific problems, how to deal with the Pepper Thread, along with platform APIs like FileIO, rendering and Audio. In addition we'll cover common issues with the Chrome Web store, distribution, and monetization. Finally, we'll be talking about exciting news and roadmaps for native client moving forward. If you're interested in NaCl, or want to learn more, this is the talk for you! Speaker: Colt McAnlis From: GoogleDevelopers Views: 3957 65 ratings Time: 36:40 More in Science & Technology

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  • Why are Awstats, Webalizer, and Google Analytics results so different?

    - by Matt
    I realize that comparing Awstats and Webalizer to Google Analytics is like comparing apples to oranges, but each of them track at least basic statistics about visitors and pages. So why are there often very significant differences in their data? For example, comparing Analytics with Awstats using some numbers from a small site over the past week: Awstats 78 unique visitors 205 visits (2.62 visits/visitor) 1,072 pages (5.22 pages/visit) Google Analytics 115 unique visitors 240 visits (2.08 visits/visitor) 1,275 pages (5.31 pages/visit) They're similar on the number of visits, but page views and uniques are quite different. I'm familiar with discrepancies of a much higher magnitude on some larger sites, showing that this trend scales proportionally upward. What is the reason behind the different numbers, even when the data is quite trivial like unique visitors and page loads?

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  • Chrome Apps Office Hours: Storage API Deep Dive

    Chrome Apps Office Hours: Storage API Deep Dive Ask and vote for questions at: goo.gl Join us next week as we take a deeper dive into the new storage APIs available to Chrome Packaged Apps. We've invited Eric Bidelman, author of the HTML5 File System API book to join Paul Kinlan, Paul Lewis, Pete LePage and Renato Dias for our weekly Chrome Apps Office Hours in which we will pick apart some of the sample Chrome Apps and explain how we've used the storage APIs and why we made the decisions we did. From: GoogleDevelopers Views: 0 0 ratings Time: 00:00 More in Science & Technology

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  • Html.RenderAction Failed when Validation Failed

    - by Shaun
    RenderAction method had been introduced when ASP.NET MVC 1.0 released in its MvcFuture assembly and then final announced along with the ASP.NET MVC 2.0. Similar as RenderPartial, the RenderAction can display some HTML markups which defined in a partial view in any parent views. But the RenderAction gives us the ability to populate the data from an action which may different from the action which populating the main view. For example, in Home/Index.aspx we can invoke the Html.RenderPartial(“MyPartialView”) but the data of MyPartialView must be populated by the Index action of the Home controller. If we need the MyPartialView to be shown in Product/Create.aspx we have to copy (or invoke) the relevant code from the Index action in Home controller to the Create action in the Product controller which is painful. But if we are using Html.RenderAction we can tell the ASP.NET MVC from which action/controller the data should be populated. in that way in the Home/Index.aspx and Product/Create.aspx views we just need to call Html.RenderAction(“CreateMyPartialView”, “MyPartialView”) so it will invoke the CreateMyPartialView action in MyPartialView controller regardless from which main view. But in my current project we found a bug when I implement a RenderAction method in the master page to show something that need to connect to the backend data center when the validation logic was failed on some pages. I created a sample application below.   Demo application I created an ASP.NET MVC 2 application and here I need to display the current date and time on the master page. I created an action in the Home controller named TimeSlot and stored the current date into ViewDate. This method was marked as HttpGet as it just retrieves some data instead of changing anything. 1: [HttpGet] 2: public ActionResult TimeSlot() 3: { 4: ViewData["timeslot"] = DateTime.Now; 5: return View("TimeSlot"); 6: } Next, I created a partial view under the Shared folder to display the date and time string. 1: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<dynamic>" %> 2:  3: <span>Now: <% 1: : ViewData["timeslot"].ToString() %></span> Then at the master page I used Html.RenderAction to display it in front of the logon link. 1: <div id="logindisplay"> 2: <% 1: Html.RenderAction("TimeSlot", "Home"); %> 3:  4: <% 1: Html.RenderPartial("LogOnUserControl"); %> 5: </div> It’s fairly simple and works well when I navigated to any pages. But when I moved to the logon page and click the LogOn button without input anything in username and password the validation failed and my website crashed with the beautiful yellow page. (I really like its color style and fonts…)   How ASP.NET MVC executes Html.RenderAction In this example all other pages were rendered successful which means the ASP.NET MVC found the TimeSolt action under the Home controller except this situation. The only different is that when I clicked the LogOn button the browser send an HttpPost request to the server. Is that the reason of this bug? I created another action in Home controller with the same action name but for HttpPost. 1: [HttpPost] 2: [ActionName("TimeSlot")] 3: public ActionResult TimeSlot(object dummy) 4: { 5: return TimeSlot(); 6: } Or, I can use the AcceptVerbsAttribute on the TimeSlot action to let it allow both HttpGet and HttpPost. 1: [AcceptVerbs("GET", "POST")] 2: public ActionResult TimeSlot() 3: { 4: ViewData["timeslot"] = DateTime.Now; 5: return View("TimeSlot"); 6: } And then repeat what I did before and this time it worked well. Why we need the action for HttpPost here as it’s just data retrieving? That is because of how ASP.NET MVC executes the RenderAction method. In the source code of ASP.NET MVC we can see when proforming the RenderAction ASP.NET MVC creates a RequestContext instance from the current RequestContext and created a ChildActionMvcHandler instance which inherits from MvcHandler class. Then the ASP.NET MVC processes the handler through the HttpContext.Server.Execute method. That means it performs the action as a stand-alone request asynchronously and flush the result into the  TextWriter which is being used to render the current page. Since when I clicked the LogOn the request was in HttpPost so when ASP.NET MVC processed the ChildActionMvcHandler it would find the action which allow the current request method, which is HttpPost. Then our TimeSlot method in HttpGet would not be matched.   Summary In this post I introduced a bug in my currently developing project regards the new Html.RenderAction method provided within ASP.NET MVC 2 when processing a HttpPost request. In ASP.NET MVC world the underlying Http information became more important than in ASP.NET WebForm world. We need to pay more attention on which kind of request it currently created and how ASP.NET MVC processes.   Hope this helps, Shaun   All documents and related graphics, codes are provided "AS IS" without warranty of any kind. Copyright © Shaun Ziyan Xu. This work is licensed under the Creative Commons License.

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  • Google+ Platform Office Hours for March 28, 2012: Hangouts API v1.0

    Google+ Platform Office Hours for March 28, 2012: Hangouts API v1.0 Here's another video from a previous session of our office hours. Watch this video to learn about the Hangouts Apps launch from +Wolff and +Jonathan. Discuss this video on Google+: goo.gl 3:31 - Publishing your hangout app 4:28 - Hangout applications vs extensions 8:00 - The application switcher 9:58 - On the terms of service, privacy policy and support contact fields 12:07 - OAuth client and hangout apps featuring the API console 15:50 - Registering as a Chrome web store developer 17:44 - Linking to your hangout 20:25 - The hangout button 24:33 - How data URIs can make things easier in your apps Q&A 29:00 - What's the status of the REST APIs? 30:41 - How do I set the hangout topic or title? 31:19 - How do those of us in other time zones know when your office hours will be held? 34:04 - Can I use the hangout button with other peoples' hangout apps? From: GoogleDevelopers Views: 2788 28 ratings Time: 35:18 More in Science & Technology

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  • Maps for Business: Generating Valid Signatures

    Maps for Business: Generating Valid Signatures This video shows developers how to generate signed requests to Google Maps for Business Web Services such as the Geocoding API. It also points Maps for Business developers to pertinent documentation like developers.google.com and shows an example of the Maps for Business Welcome Letter. To get a response from the Maps for Business API Web Services, developers need to know: how to find their Maps For Business client ID; how to include that client ID in requests; how to retrieve their Maps for Business digital signing key from the Maps for Business welcome materials; and how to use the key to generate a signature. The video will walk developers through the signature generation steps using Python, and provides pointers to examples in other languages. From: GoogleDevelopers Views: 7 0 ratings Time: 10:42 More in Science & Technology

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  • The Breakpoint Ep 3: The Sourcemap Spectacular with Paul Irish and Addy Osmani

    The Breakpoint Ep 3: The Sourcemap Spectacular with Paul Irish and Addy Osmani Ask and vote for questions at goo.gl Take Coffeescript to Javascript to Minified and all the way back with source maps. In addition to a new Coffeescript sourcemap workflow, we'll cover the latest sourcemap updates so you can understand how to dramatically improve your debugging experience. Finally, Paul and Addy will be joined by special guest—Yeoman core contributor Sindre Sorhus—to discuss what big new changes are coming to the project. From: GoogleDevelopers Views: 0 0 ratings Time: 01:00:00 More in Science & Technology

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  • design pattern advice: graph -> computation

    - by csetzkorn
    I have a domain model, persisted in a database, which represents a graph. A graph consists of nodes (e.g. NodeTypeA, NodeTypeB) which are connected via branches. The two generic elements (nodes and branches will have properties). A graph will be sent to a computation engine. To perform computations the engine has to be initialised like so (simplified pseudo code): Engine Engine = new Engine() ; Object ID1 = Engine.AddNodeTypeA(TypeA.Property1, TypeA.Property2, …, TypeA.Propertyn); Object ID2 = Engine.AddNodeTypeB(TypeB.Property1, TypeB.Property2, …, TypeB.Propertyn); Engine.AddBranch(ID1,ID2); Finally the computation is performed like this: Engine.DoSomeComputation(); I am just wondering, if there are any relevant design patterns out there, which help to achieve the above using good design principles. I hope this makes sense. Any feedback would be very much appreciated.

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  • Google I/O 2012 - Powering Your Application's Data using Google Cloud Storage

    Google I/O 2012 - Powering Your Application's Data using Google Cloud Storage Navneet Joneja, Nathan Herring Since opening its doors to all developers at Google I/O last year, the Google Cloud Storage team has shipped several features that let you use Google Cloud Storage for a variety of advanced use cases. This session will open with a quick introduction to the product, and quickly shift focus to implementing a variety of advanced applications using new features in Google Cloud Storage. For all I/O 2012 sessions, go to developers.google.com From: GoogleDevelopers Views: 48 1 ratings Time: 58:32 More in Science & Technology

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  • Google Developers SXSW Lightning Talks

    Google Developers SXSW Lightning Talks Can't make it to the Google Developers house at SXSW? Don't worry, we've got you covered with a live stream of the exciting, demo-loaded lightning talks where you'll learn about the latest Google developer product hotness. Come watch what happens as we stream live from the Google Developers house in Austin, while a rain storm engulfs the city! Here is the schedule of talks: 1) Holo: Exploring the design of the Android user interface 2) The next gen of Social Apps is in a Hangout: introducing Google+ Hangout Apps 3) The VJ in Your Pocket: Mobile YouTube API Apps for Content Creators, Curators and Consumers 4) Cloud adventures: Instant scale... from zero to millions of hits in 24 hours 5) HTML5's Bleeding Edge 6) Beautiful Maps: enhancing geographic information with HTML5 You can learn more about the lightning talks and speakers at: www.google.com From: GoogleDevelopers Views: 19900 326 ratings Time: 02:49:00 More in Entertainment

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  • How do I report a missing package dependency during an upgrade?

    - by crasic
    A friend of mine (somewhat new to linux) recently upgraded from 10.10 to 11.04 and his OS broke from the upgrade. A few minutes of troubleshooting showed that the culprit was the PAE kernel that the upgrade decided to install since it determined he had 4GB of phyisical RAM. More specifically the upgrade forgot to install the linux-headers-generic-pae required by the closed source nvidia drivers. I'm not entirely sure how to report this bug to the devs. Its an easy fix (after booting into the non-pae kernel and installing the package everything worked), but they are encouraging users to use the built-in bug reporting system and I'm not entirely certain how to report update bugs.

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