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• Question regarding common class

  - by Rocky Singh

  I have following two classes: public class A : System.Web.UI.WebControls.Button { public virtual string X { get { object obj = ViewState["X"]; if (obj != null) return (string)obj; return null; } set { ViewState["X"] = value; } } protected override void OnLoad(EventArgs e) { X=2; } } and public class B : System.Web.UI.WebControls.TextBox { public virtual string X { get { object obj = ViewState["X"]; if (obj != null) return (string)obj; return null; } set { ViewState["X"] = value; } } protected override void OnLoad(EventArgs e) { X=2; } } As you must be seeing the class A and B have exactly the same code , my question is how can I make a common class for it and use these two classes.

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• Rails Nested Attributes, Relationship for Shared or Common Object

  - by SooDesuNe

  This has to be a common problem, so I'm surprised that Google didn't turn up more answers. I'm working on a rails app that has several different kinds of entities, those entities by need a relation to a different entity. For example: Address: a Model that stores the details of a street address (this is my shared entity) PersonContact: a Model that includes things like home phone, cell phone and email address. This model needs to have an address associated with it DogContact: Obviously, if you want to contact a dog, you have to go to where it lives. So, PersonContact and DogContact should have foreign keys to Address. Even, though they are really the "owning" object of Address. This would be fine, except that accepts_nested_attributes_for is counting on the foreign key being in Address to work correctly. What's the correct strategy to keep the foreign key in Address, but have PersonContact and DogContact be the owning objects?

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• Most common software development mistakes

  - by hgulyan

  Inspired by Dealing with personal failure, I remembered my own failed software development experience. Finally I agreed to rewrite existing application. It took me less than a week to rewrite existing app and more up to 2 months to write from zero my own. That 2 months were really hard and interesting. It was my first big software development process. I researched almost everything concerning to my application. Read Code Complete. Even some articles on how to create user interface. Some psychology stuff. Typography, Colors. DAL, DB Structure, SOA, Patterns, UML, Load testing etc. I hope, that after a month or 2 I would get opportunity to continue working on my failed project, but before that, I would like to ask: What are common mistakes in software development? What you shouldn't do in any case?

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• Find common nodes from two linked lists using recursion

  - by Dan

  I have to write a method that returns a linked list with all the nodes that are common to two linked lists using recursion, without loops. For example, first list is 2 - 5 - 7 - 10 second list is 2 - 4 - 8 - 10 the list that would be returned is 2 - 10 I am getting nowhere with this.. What I have been think of was to check each value of the first list with each value of the second list recursively but the second list would then be cut by one node everytime and I cannot compare the next value in the first list with the the second list. I hope this makes sense... Can anyone help?

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• C++: Most common way to talk to one application from the other one

  - by MInner

  In bare outlines, I've got an application which looks through the directories at startup and creates special files' index - after that it works like daemon. The other application creates such 'special' files and places them in some directory. What way of informing the first application about a new file (to index it) is the most common, simple (the first one is run-time, so it shouldn't slow it too much), and cross-platform if it is possible? I've looked through RPC and IPC but they are too heavy (also non-cross-platform and slow (need a lot of features to work - I need a simple light well-working way), probably).

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• Efficient most common suffix algorithm?

  - by taw

  I have a few GBs worth of strings, and for every prefix I want to find 10 most common suffixes. Is there an efficient algorithm for that? An obvious solution would be: Store sorted list of <string, count> pairs. Identify by binary search extent for prefix we're searching. Find 10 highest counts in this extent. Possibly precompute it for all short prefixes, so it doesn't ever need to look at large portion of data. I'm not sure if that would actually be efficient at all. Is there a better way I overlooked? Answers must be real time, but it can take as much preprocessing as necessary.

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• NHibernate: discriminator without common base class?

  - by joniba

  Is it possible to map two classes to the same property without them sharing a common base class? For example, a situation like this: class Rule { public virtual int SequenceNumber { get; set; } public virtual ICondition Condition { get; set; } } interface ICondition { } class ExpressionCondition : ICondition { public virtual string Expression { get; set; } } class ThresholdCondition : ICondition { public virtual int Threshold { get; set; } } I also cannot add some empty abstract class that both conditions inherit from because the two ICondition implementations exist in different domains that are not allowed to reference each other. (Please no responses telling me that this situation should not occur in the first place - I'm aware of it and it doesn't help me.)

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• Grails ClassNotFoundException com.google.common.collect.Maps

  - by user1734199

  I need some help, I am trying to make an controller using Google Analytics API, but using: statsController.groovy /**************************************************************/ import com.google.gdata.client.analytics.AnalyticsService class StatsController { def myService def stats(){ myService = new AnalyticsService("example-App"); } } /************************************************************/ error Message: ClassNotFoundException occurred when processing request: [...] com.google.common.collect.Maps I ve tryed adding to the buildpath the "gdata.analytics*.jar", "google-collect-1.0.jar", "guava.jar" and "jsr305.jar" but without results, the error always says that i described or NotDefClassError ocurred when processing request: [...] com.google.gdata.client.analytics.AnalyticsService. I need to solve.

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• Design pattern to encapsulate common funtionality among UI controls

  - by Dan

  I'm brainstorming some ideas around a pattern to use for the following scenario. I have some 3rd party controls that I want to add common functionality to. Functionality is added by handling several of the the events and doing certain things when the events fire along with adding some private variables to hold some state info between events. I want to reuse the code and functionality so this is what I'd typically do. Create a class for this functionality and pass in the instance of the control that I want to add the functionality to in the constructor. Then I can add event handlers to the control in the instance of the class. Can anyone think of alternative patterns to use in order to create this kind of reusable functionality.

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• Common Utility for Exception Searching

  - by Andrew

  I wrote this little helper method to search the exception chain for a particular exception (either equals or super class). However, this seems like a solution to a common problem, so was thinking it must already exist somewhere, possibly in a library I have already imported. So, any ideas on if/where this might exist? boolean exceptionSearch(Exception base, Class<?> search) { Throwable e = base; do { if (search.isAssignableFrom(e.getClass())) { return true; } } while ((e = e.getCause()) != null); return false; }

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• Find MySQL entries with same set of column B values for their common column A value

  - by nnsd44g

  I have: +----+------+------+ | id | A | B | +----+------+------+ | 1 | 1 | 1 | < | 2 | 1 | 2 | < | 3 | 2 | 2 | | 4 | 2 | 3 | | 5 | 3 | 1 | < | 6 | 3 | 2 | < | 7 | 4 | 4 | | 8 | 4 | 5 | +----+------+------+ I need to select the entries that have the same set of B values for their common A value. So, in this case, I need ids 1, 2 and 5, 6 because in those cases the sequence of B values is 1, 2. Is this possible? Thanks!

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• CLR - Common language runtime detected an invalid program in VS.NET

  - by Jimmy

  I have been using Visual Studio 2008 quite long but lately I am getting this message when I am developing an application in C#: Common language runtime detected an invalid program This happens when I try to enter to the properties of a component (text masked box properties, tool box property etc..). But it really became a problem when I tried to launch an other solution that I downloaded from the Developer's 5 star program of Microsoft and it didn't allowed me to launch at all and just got the same problem... I looked for the answer at google but just got some clues about people having the same vague error but in different situations like in ASP.NET I would appreciate any help with this issue... :( I do not want to reinstall VS, that will be my last resource... Update: I never figured out what the problem was so I installed a virtual machine with Windows XP on it, there I only have Visual Studio and Netbeans.

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• How to get common field in ten tables with different field name

  - by Fero

  Hi all, I am having a common field in ten tables with different field name. example: table1: t1_id     t1_location 1         india 2         china 3         america table2: t2_id     t2_location 4         london 5         australia 6         america Now my o/p should be: location india china america london australia How should i get that using mysql query. thanks in advance

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• Find a common element within N arrays

  - by kunjaan

  If I have N arrays, what is the best(Time complexity. Space is not important) way to find the common elements. You could just find 1 element and stop. Edit: The elements are all Numbers. Edit: These are unsorted. Please do not sort and scan. This is not a homework problem. Somebody asked me this question a long time ago. He was using a hash to solve the problem. I was thinking if SO has solved similar problems.

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• Inserting Record into multiple tables No Common ID

  - by the_

  OK so I have two tables, MEDIA and BUSINESS. I want it set up so the forms to input into them are on the same page. MEDIA has a row that is biz_id that is the id of BUSINESS. So MEDIA is really a part of BUSINESS. HOW do I insert/add these into their tables without a common ID because I haven't yet made the record for business? I'm sorry I didn't really word this very much... You might need more clarification to answer properly and I'll be glad to give any more info. Any help would be greatly appreciated, thanks!

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• Common type for generic classes of different types

  - by DinGODzilla

  I have (for example) Dictionary of different generic types (d1, d2, d3, d4) and I want to store them in something var d1 = new Dictionary<int, string>(); var d2 = new Dictionary<int, long>(); var d3 = new Dictionary<DateTime, bool>(); var d4 = new Dictionary<string, object>(); var something = ??? //new List<object> {d1, d2, d3, d4}; Is there any other way how to store that in something with common denominator different than object? Thanks :-)

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• What is New in ASP.NET 4.0 Code Access Security

  - by HosamKamel

  ASP.NET Code Access Security (CAS) is a feature that helps protect server applications on hosting multiple Web sites, ASP.NET lets you assign a configurable trust level that corresponds to a predefined set of permissions. ASP.NET has predefined ASP.NET Trust Levels and Policy Files that you can assign to applications, you also can assign custom trust level and policy files. Most web hosting companies run ASP.NET applications in Medium Trust to prevent that one website affect or harm another site etc. As .NET Framework's Code Access Security model has evolved, ASP.NET 4.0 Code Access Security also has introduced several changes and improvements.   A Full post addresses the new changes in ASP.NET 4.0 is published at Asp.Net QA Team Here http://weblogs.asp.net/asptest/archive/2010/04/23/what-is-new-in-asp-net-4-0-code-access-security.aspx

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• Convert OpenGL code to DirectX

  - by Fredrik Boston Westman

  First of all, this is kind of a follow up question on @byte56 excellent anwser on this question concerning picking algorithms. I'm trying to convert one of his code examples to directX 11 however I have run into some problems ( I can pick but the picking is way off), and I wanted to make sure I had done it right before moving on and checking the rest of my code. I am not that familiar with openGl but I can imagine openGl has different coordinations systems, and functions that alters how you must implement to code a bit. The getPickRay function on the answer linked is what I'm trying to convert. This is the part of my code that I think is giving me trouble when converting from openGl to directX Because I'm unsure on how their different coordination systems differs from one another. PRVecX = ((( 2.0f * mouseX) / ClientWidth ) - 1 ) * tan((viewAngle)/2); PRVecY = (1-(( 2.0f * mouseY) / ClientHeight)) * tan((viewAngle)/2); Another thing that I am unsure about is this part: XMVECTOR worldSpaceNear = XMVector3TransformCoord(cameraSpaceNear, invMat); XMVECTOR worldSpaceFar = XMVector3TransformCoord(cameraSpaceFar, invMat); A couple of notes: The mouse coordinates are already converted so that the top left corner of the client window would be (0,0) and the bottom right (800,600) ( or whatever resolution you would have) The viewAngle is the same angle that I used when setting the camera view with XMMatrixPerspectiveFovLH. I removed the variables aspectRatio and zoomFactor because I assumed that they were related to some specific function of his game. To summarize it up to questions : Does the openGL coordination system differ in such a way that this equation in the first of my code examples wouldn't be valid when used in DirectX 11 ( with its respective screen coordination system)? Is the openGL method Matrix4f.transform(a, b, c) equal to the directX method c = XMVector3TransformCoord(b,a)? (where a is a matrix and b,c are vectors). Because I know when it comes to matrices order is important.

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• Enable Automatic Code First Migrations On SQL Database in Azure Web Sites

  - by Steve Michelotti

  Now that Azure supports .NET Framework 4.5, you can use all the latest and greatest available features. A common scenario is to be able to use Entity Framework Code First Migrations with a SQL Database in Azure. Prior to Code First Migrations, Entity Framework provided database initializers. While convenient for demos and prototypes, database initializers weren’t useful for much beyond that because, if you delete and re-create your entire database when the schema changes, you lose all of your operational data. This is the void that Migrations are meant to fill. For example, if you add a column to your model, Migrations will alter the database to add the column rather than blowing away the entire database and re-creating it from scratch. Azure is becoming increasingly easier to use – especially with features like Azure Web Sites. Being able to use Entity Framework Migrations in Azure makes deployment easier than ever. In this blog post, I’ll walk through enabling Automatic Code First Migrations on Azure. I’ll use the Simple Membership provider for my example. First, we’ll create a new Azure Web site called “migrationstest” including creating a new SQL Database along with it:   Next we’ll go to the web site and download the publish profile:   In the meantime, we’ve created a new MVC 4 website in Visual Studio 2012 using the “Internet Application” template. This template is automatically configured to use the Simple Membership provider. We’ll do our initial Publish to Azure by right-clicking our project and selecting “Publish…”. From the “Publish Web” dialog, we’ll import the publish profile that we downloaded in the previous step:   Once the site is published, we’ll just click the “Register” link from the default site. Since the AccountController is decorated with the [InitializeSimpleMembership] attribute, the initializer will be called and the initial database is created.   We can verify this by connecting to our SQL Database on Azure with SQL Management Studio (after making sure that our local IP address is added to the list of Allowed IP Addresses in Azure): One interesting note is that these tables got created with the default Entity Framework initializer – which is to create the database if it doesn’t already exist. However, our database did already exist! This is because there is a new feature of Entity Framework 5 where Code First will add tables to an existing database as long as the target database doesn’t contain any of the tables from the model. At this point, it’s time to enable Migrations. We’ll open the Package Manger Console and execute the command: PM> Enable-Migrations -EnableAutomaticMigrations This will enable automatic migrations for our project. Because we used the "-EnableAutomaticMigrations” switch, it will create our Configuration class with a constructor that sets the AutomaticMigrationsEnabled property set to true: 1: public Configuration() 2: { 3: AutomaticMigrationsEnabled = true; 4: } We’ll now add our initial migration: PM> Add-Migration Initial This will create a migration class call “Initial” that contains the entire model. But we need to remove all of this code because our database already exists so we are just left with empty Up() and Down() methods. 1: public partial class Initial : DbMigration 2: { 3: public override void Up() 4: { 5: } 6: 7: public override void Down() 8: { 9: } 10: } If we don’t remove this code, we’ll get an exception the first time we attempt to run migrations that tells us: “There is already an object named 'UserProfile' in the database”. This blog post by Julie Lerman fully describes this scenario (i.e., enabling migrations on an existing database). Our next step is to add the Entity Framework initializer that will automatically use Migrations to update the database to the latest version. We will add these 2 lines of code to the Application_Start of the Global.asax: 1: Database.SetInitializer(new MigrateDatabaseToLatestVersion<UsersContext, Configuration>()); 2: new UsersContext().Database.Initialize(false); Note the Initialize() call will force the initializer to run if it has not been run before. At this point, we can publish again to make sure everything is still working as we are expecting. This time we’re going to specify in our publish profile that Code First Migrations should be executed:   Once we have re-published we can once again navigate to the Register page. At this point the database has not been changed but Migrations is now enabled on our SQL Database in Azure. We can now customize our model. Let’s add 2 new properties to the UserProfile class – Email and DateOfBirth: 1: [Table("UserProfile")] 2: public class UserProfile 3: { 4: [Key] 5: [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 6: public int UserId { get; set; } 7: public string UserName { get; set; } 8: public string Email { get; set; } 9: public DateTime DateOfBirth { get; set; } 10: } At this point all we need to do is simply re-publish. We’ll once again navigate to the Registration page and, because we had Automatic Migrations enabled, the database has been altered (*not* recreated) to add our 2 new columns. We can verify this by once again looking at SQL Management Studio:   Automatic Migrations provide a quick and easy way to keep your database in sync with your model without the worry of having to re-create your entire database and lose data. With Azure Web Sites you can set up automatic deployment with Git or TFS and automate the entire process to make it dead simple.

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• Permission denied error when trying to install with wubi

  - by badri

  I run into problem when tried to install Ubuntu 11.04 on Windows 7 using wubi installer . It downloads the image for sometime and ends up with the error that says Permission denied: for more details see the log file In the log it seems to be like DownloadError: Problem connecting to tracker - urlopen error (10060, 'Operation timed out') but my network is good and I checked it. Tried using wubi several times, but ends up with same problem. Log content: 10-08 16:56 DEBUG TaskList: ### Finished get_metalink 10-08 16:56 DEBUG TaskList: New task download 10-08 16:56 DEBUG TaskList: ### Running download... 10-08 16:56 DEBUG btdownloader: downloading http://releases.ubuntu.com/11.04/ubuntu-11.04-desktop-amd64.iso.torrent > C:\ubuntu\install\ubuntu-11.04-desktop-amd64.iso 10-08 18:02 ERROR TaskList: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 229, in listen_forever File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 221, in listen_forever File "\lib\bittorrent\Rerequester.py", line 96, in fail File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Problem connecting to tracker - urlopen error (10060, 'Operation timed out') Traceback (most recent call last): File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\common\btdownloader.py", line 79, in download File "\lib\bittorrent\download.py", line 303, in download File "\lib\bittorrent\RawServer.py", line 256, in listen_forever File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 229, in listen_forever File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 221, in listen_forever File "\lib\bittorrent\Rerequester.py", line 96, in fail File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Problem connecting to tracker - urlopen error (10060, 'Operation timed out') 10-08 18:02 ERROR TaskList: Non fatal error Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 229, in listen_forever File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Traceback (most recent call last): File "\lib\bittorrent\RawServer.py", line 221, in listen_forever File "\lib\bittorrent\Rerequester.py", line 96, in fail File "\lib\wubi\backends\common\btdownloader.py", line 70, in error_callback DownloadError: Problem connecting to tracker - urlopen error (10060, 'Operation timed out') in task download 10-08 18:02 DEBUG TaskList: ### Finished download 10-08 18:02 ERROR TaskList: [Errno 13] Permission denied: u'C:\\ubuntu\\install\\ubuntu-11.04-desktop-amd64.iso' Traceback (most recent call last): File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\common\backend.py", line 492, in get_iso File "\lib\wubi\backends\common\backend.py", line 347, in download_iso OSError: [Errno 13] Permission denied: u'C:\\ubuntu\\install\\ubuntu-11.04-desktop-amd64.iso' 10-08 18:02 DEBUG TaskList: # Cancelling tasklist 10-08 18:02 DEBUG TaskList: # Finished tasklist 10-08 18:02 ERROR root: [Errno 13] Permission denied: u'C:\\ubuntu\\install\\ubuntu-11.04-desktop-amd64.iso' Traceback (most recent call last): File "\lib\wubi\application.py", line 57, in run File "\lib\wubi\application.py", line 131, in select_task File "\lib\wubi\application.py", line 157, in run_installer File "\lib\wubi\backends\common\tasklist.py", line 197, in __call__ File "\lib\wubi\backends\common\backend.py", line 492, in get_iso File "\lib\wubi\backends\common\backend.py", line 347, in download_iso OSError: [Errno 13] Permission denied: u'C:\\ubuntu\\install\\ubuntu-11.04-desktop-amd64.iso'

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• Should I implement BackBone.js into my ASP.NET WebForms applications?

  - by Walter Stabosz

  Background I'm trying to improve my group's current web app development pattern. Our current pattern is something we came up with while trying to rich web apps on top of ASP.NET WebForms (none of us knew ASP.NET MVC). This is the current pattern: ! Our application is using the WinForms Framework. Our ASPX pages are essentially just HTML, we use almost no WebControls. We use JavaScript/jQuery to perform all of our UI events and AJAX calls. For a single ASPX page, we have a single .js file. All of our AJAX calls are POSTs (not RESTful at all) Our AJAX calls contact WebMethods which we have defined in a series of ASMX files. One ASMX file per business object. Why Change? I want to revise our pattern a bit for a couple of reasons: We're starting to find that our JavaScript files are getting a bit unwieldy. We're using a hodgepodge of methods for keeping our local data and DOM updates in sync. We seem to spend too much time writing code to keep things in sync, and it can get tricky to debug. I've been reading Developing Backbone.js Applications and I like a lot of what Backbone has to offer in terms of code organization and separation of concerns. However, I've gotten to the chapter on RESTful app, I started to feel some hesitation about using Backbone. The Problem The problem is our WebMethods do not really fit into the RESTful pattern, which seems to be the way Backbone wants to consume them. For now, I'd only like to address our issue of disorganized client side code. I'd like to avoid major rewrites to our WebMethods. My Questions Is it possible to use Backbone (or a similar library) to clean up our client code, while not majorly impacting our data access WebMethods? Or would trying to use Backbone in this manner be a bastardization of it's intended use? Anyone have any suggestions for improving our pattern in the area of code organization and spending less time writing DOM and data sync code?

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• Chicago Code Camp Call For Speakers

  - by Tim Murphy

  The Chicago Code Camp is coming up on May 1st, 2010.  They are still looking for speaker.  If you have a rock’n code demonstration that you would like to present to the community be sure to sign up.  If you know someone else who has some ideas that you really think they should share with the world guilt them in to signing up.  http://www.chicagocodecamp.com/ del.icio.us Tags: Chicago Code Camp,call for speakers

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• Dream.In.Code Podcast 15 with Michael Crump

  - by mbcrump

  I was recently interviewed by Dennis Delimarsky for his podcast titled “Dream.In.Code”. We talked for about an hour on all things Silverlight and Windows Phone 7. Dennis asked a lot of great questions and I thoroughly enjoyed chatting with him. Check out the interview and let me know what you think. Listen to the podcast. Dream.In.Code Website Thanks again to Dream In Code for this opportunity.  Subscribe to my feed

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• Writing C# Code Using SOLID Principles

  - by bipinjoshi

  Most of the modern programming languages including C# support objected oriented programming. Features such as encapsulation, inheritance, overloading and polymorphism are code level features. Using these features is just one part of the story. Equally important is to apply some object oriented design principles while writing your C# code. SOLID principles is a set of five such principles--namely Single Responsibility Principle, Open/Closed Principle, Liskov Substitution Principle, Interface Segregation Principle and Dependency Inversion Principle. Applying these time proven principles make your code structured, neat and easy to maintain. This article discusses SOLID principles and also illustrates how they can be applied to your C# code.http://www.binaryintellect.net/articles/7f857089-68f5-4d76-a3b7-57b898b6f4a8.aspx 

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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! 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