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• JavaScript Data Binding Frameworks

  - by dwahlin

  Data binding is where it’s at now days when it comes to building client-centric Web applications. Developers experienced with desktop frameworks like WPF or web frameworks like ASP.NET, Silverlight, or others are used to being able to take model objects containing data and bind them to UI controls quickly and easily. When moving to client-side Web development the data binding story hasn’t been great since neither HTML nor JavaScript natively support data binding. This means that you have to write code to place data in a control and write code to extract it. Although it’s certainly feasible to do it from scratch (many of us have done it this way for years), it’s definitely tedious and not exactly the best solution when it comes to maintenance and re-use. Over the last few years several different script libraries have been released to simply the process of binding data to HTML controls. In fact, the subject of data binding is becoming so popular that it seems like a new script library is being released nearly every week. Many of the libraries provide MVC/MVVM pattern support in client-side JavaScript apps and some even integrate directly with server frameworks like Node.js. Here’s a quick list of a few of the available libraries that support data binding (if you like any others please add a comment and I’ll try to keep the list updated): AngularJS MVC framework for data binding (although closely follows the MVVM pattern). Backbone.js MVC framework with support for models, key/value binding, custom events, and more. Derby Provides a real-time environment that runs in the browser an in Node.js. The library supports data binding and templates. Ember Provides support for templates that automatically update as data changes. JsViews Data binding framework that provides “interactive data-driven views built on top of JsRender templates”. jQXB Expression Binder Lightweight jQuery plugin that supports bi-directional data binding support. KnockoutJS MVVM framework with robust support for data binding. For an excellent look at using KnockoutJS check out John Papa’s course on Pluralsight. Meteor End to end framework that uses Node.js on the server and provides support for data binding on  the client. Simpli5 JavaScript framework that provides support for two-way data binding. WinRT with HTML5/JavaScript If you’re building Windows 8 applications using HTML5 and JavaScript there’s built-in support for data binding in the WinJS library.   I won’t have time to write about each of these frameworks, but in the next post I’m going to talk about my (current) favorite when it comes to client-side JavaScript data binding libraries which is AngularJS. AngularJS provides an extremely clean way – in my opinion - to extend HTML syntax to support data binding while keeping model objects (the objects that hold the data) free from custom framework method calls or other weirdness. While I’m writing up the next post, feel free to visit the AngularJS developer guide if you’d like additional details about the API and want to get started using it.

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• NHunspellTextBoxExtender - A Spellchecking IExtenderProvider for TextBoxes using Hunspell for .NET

  Extends controls inheriting TextBoxBase to provide off-line spell checking functionality

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• .NET Weak Event Handlers – Part II

  - by João Angelo

  On the first part of this article I showed two possible ways to create weak event handlers. One using reflection and the other using a delegate. For this performance analysis we will further differentiate between creating a delegate by providing the type of the listener at compile time (Explicit Delegate) vs creating the delegate with the type of the listener being only obtained at runtime (Implicit Delegate). As expected, the performance between reflection/delegate differ significantly. With the reflection based approach, creating a weak event handler is just storing a MethodInfo reference while with the delegate based approach there is the need to create the delegate which will be invoked later. So, at creating the weak event handler reflection clearly wins, but what about when the handler is invoked. No surprises there, performing a call through reflection every time a handler is invoked is costly. In conclusion, if you want good performance when creating handlers that only sporadically get triggered use reflection, otherwise use the delegate based approach. The explicit delegate approach always wins against the implicit delegate, but I find the syntax for the latter much more intuitive. // Implicit delegate - The listener type is inferred at runtime from the handler parameter public static EventHandler WrapInDelegateCall(EventHandler handler); public static EventHandler<TArgs> WrapInDelegateCall<TArgs>(EventHandler<TArgs> handler) where TArgs : EventArgs; // Explicite delegate - TListener is the type that defines the handler public static EventHandler WrapInDelegateCall<TListener>(EventHandler handler); public static EventHandler<TArgs> WrapInDelegateCall<TArgs, TListener>(EventHandler<TArgs> handler) where TArgs : EventArgs;

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• Parallelism in .NET – Part 19, TaskContinuationOptions

  - by Reed

  My introduction to Task continuations demonstrates continuations on the Task class.  In addition, I’ve shown how continuations allow handling of multiple tasks in a clean, concise manner.  Continuations can also be used to handle exceptional situations using a clean, simple syntax. In addition to standard Task continuations , the Task class provides some options for filtering continuations automatically.  This is handled via the TaskContinationOptions enumeration, which provides hints to the TaskScheduler that it should only continue based on the operation of the antecedent task. This is especially useful when dealing with exceptions.  For example, we can extend the sample from our earlier continuation discussion to include support for handling exceptions thrown by the Factorize method: // Get a copy of the UI-thread task scheduler up front to use later var uiScheduler = TaskScheduler.FromCurrentSynchronizationContext(); // Start our task var factorize = Task.Factory.StartNew( () => { int primeFactor1 = 0; int primeFactor2 = 0; bool result = Factorize(10298312, ref primeFactor1, ref primeFactor2); return new { Result = result, Factor1 = primeFactor1, Factor2 = primeFactor2 }; }); // When we succeed, report the results to the UI factorize.ContinueWith(task => textBox1.Text = string.Format("{0}/{1} [Succeeded {2}]", task.Result.Factor1, task.Result.Factor2, task.Result.Result), CancellationToken.None, TaskContinuationOptions.NotOnFaulted, uiScheduler); // When we have an exception, report it factorize.ContinueWith(task => textBox1.Text = string.Format("Error: {0}", task.Exception.Message), CancellationToken.None, TaskContinuationOptions.OnlyOnFaulted, uiScheduler); .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } The above code works by using a combination of features.  First, we schedule our task, the same way as in the previous example.  However, in this case, we use a different overload of Task.ContinueWith which allows us to specify both a specific TaskScheduler (in order to have your continuation run on the UI’s synchronization context) as well as a TaskContinuationOption.  In the first continuation, we tell the continuation that we only want it to run when there was not an exception by specifying TaskContinuationOptions.NotOnFaulted.  When our factorize task completes successfully, this continuation will automatically run on the UI thread, and provide the appropriate feedback. However, if the factorize task has an exception – for example, if the Factorize method throws an exception due to an improper input value, the second continuation will run.  This occurs due to the specification of TaskContinuationOptions.OnlyOnFaulted in the options.  In this case, we’ll report the error received to the user. We can use TaskContinuationOptions to filter our continuations by whether or not an exception occurred and whether or not a task was cancelled.  This allows us to handle many situations, and is especially useful when trying to maintain a valid application state without ever blocking the user interface.  The same concepts can be extended even further, and allow you to chain together many tasks based on the success of the previous ones.  Continuations can even be used to create a state machine with full error handling, all without blocking the user interface thread.

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• Uncovering Compiler Errors in ASP.NET MVC Views

  - by Ben Griswold

  ASPX and ASCX files are compiled on the fly when they are requested on the web server. This means it’s possible that you aren’t catching compile errors associated with your views when you build your ASP.NET MVC project in Visual Studio.  Unless you’re willing to click through your entire application, rendering each view looking for errors, you application is left a little vulnerable to user issues.  Fortunately, there’s a work around.  Open up your MVC project file in notepad or within the Visual Studio IDE by unloading the project and then editing the .csproj file (both actions are available by right-clicking on the Project Node in Solution Explorer.)  Notice the MvcBuildViews option.  It’s probably set to false.  Flip the value to true and you’ll magically start compiling your views when you build your application. <MvcBuildViews>false</MvcBuildViews> Taking this action will slow down your builds a bit, but if you’re a hack like me, it’ll probably save your day in the long run. Now you’re probably thinking, “Neat trick – how’s it work?”  Scroll down toward the bottom of your csproj file and you will notice the AfterBuild target triggers the AspNetCompiler action if the MvcBuildViews option is set to true.  <Target Name="AfterBuild" Condition="'$(MvcBuildViews)'=='true'">   <AspNetCompiler VirtualPath="temp"                   PhysicalPath="$(ProjectDir)\..\$(ProjectName)" /> </Target> Great. One more thing. Let’s say you don’t want to slow down all of your builds, but you absolutely want to know if there are any compiler issues with your views before you commit your code to version control or deploy or whatever.  Here’s what you can do – change the AfterBuild condition to run if your configuration is set to Release mode.  <Target Name="AfterBuild" Condition="'$(Configuration)'=='Release'">   <!– Always pre-compile ASPX and ASCX in release mode –>   <AspNetCompiler VirtualPath="temp"                   PhysicalPath="$(ProjectDir)\..\$(ProjectName)" /> </Target> Now your debug mode builds will continue to be as fast as ever and you can quickly validate your views by building in release mode when you so choose.  There’s one little catch – this setup won’t consider the MvcBuildViews option whatsoever! So if you decide to go with this configuration, you might want to add a comment near the MvcBuildViews option letting other developers know they can change the MvcBuildViews option as much as they’d like but it’s not going to affect the AfterBuild action.  Or don’t include the comment and let your team members figure it out for themselves…

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• Red Gate .NET Tool Support for Visual Studio 2010

  - by Bart Read

  A *small* matter left unaddressed in my last post....(read more)

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• Building a better .NET Application Configuration Class - revisited

  - by Rick Strahl

  Managing configuration settings is an important part of successful applications. It should be easy to ensure that you can easily access and modify configuration values within your applications. If it's not - well things don't get parameterized as much as they should. In this post I discuss a custom Application Configuration class that makes it super easy to create reusable configuration objects in your applications using a code-first approach and the ability to persist configuration information into various types of configuration stores.

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• A Simple Online Document Management System Using Asp.net MVC 3

  - by RazanPaul

  Nowadays we have a number of online file management systems (e.g. DropBox, SkyDrive and Google Drive). People can use them to manage different types of documents. However, one might need a system to manage documents when they do not want to publish the company documents to the cloud. In that case, they need to build an online document management system. This project is intended to meet this purpose. However, it is in the early stage. All the functionalities seem working. A lot of work is needed in the UI. Besides this, code needs refactoring. Please find the project at the following link: https://documentmanagementsystem.codeplex.com/

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• .NET Properties - Use Private Set or ReadOnly Property?

  - by tgxiii

  In what situation should I use a Private Set on a property versus making it a ReadOnly property? Take into consideration the two very simplistic examples below. First example: Public Class Person Private _name As String Public Property Name As String Get Return _name End Get Private Set(ByVal value As String) _name = value End Set End Property Public Sub WorkOnName() Dim txtInfo As TextInfo = _ Threading.Thread.CurrentThread.CurrentCulture.TextInfo Me.Name = txtInfo.ToTitleCase(Me.Name) End Sub End Class // ---------- public class Person { private string _name; public string Name { get { return _name; } private set { _name = value; } } public void WorkOnName() { TextInfo txtInfo = System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo; this.Name = txtInfo.ToTitleCase(this.Name); } } Second example: Public Class AnotherPerson Private _name As String Public ReadOnly Property Name As String Get Return _name End Get End Property Public Sub WorkOnName() Dim txtInfo As TextInfo = _ Threading.Thread.CurrentThread.CurrentCulture.TextInfo _name = txtInfo.ToTitleCase(_name) End Sub End Class // --------------- public class AnotherPerson { private string _name; public string Name { get { return _name; } } public void WorkOnName() { TextInfo txtInfo = System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo; _name = txtInfo.ToTitleCase(_name); } } They both yield the same results. Is this a situation where there's no right and wrong, and it's just a matter of preference?

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• ASP.NET ViewState Tips and Tricks #1

  - by João Angelo

  In User Controls or Custom Controls DO NOT use ViewState to store non public properties. Persisting non public properties in ViewState results in loss of functionality if the Page hosting the controls has ViewState disabled since it can no longer reset values of non public properties on page load. Example: public class ExampleControl : WebControl { private const string PublicViewStateKey = "Example_Public"; private const string NonPublicViewStateKey = "Example_NonPublic"; // DO public int Public { get { object o = this.ViewState[PublicViewStateKey]; if (o == null) return default(int); return (int)o; } set { this.ViewState[PublicViewStateKey] = value; } } // DO NOT private int NonPublic { get { object o = this.ViewState[NonPublicViewStateKey]; if (o == null) return default(int); return (int)o; } set { this.ViewState[NonPublicViewStateKey] = value; } } } // Page with ViewState disabled public partial class ExamplePage : Page { protected override void OnLoad(EventArgs e) { base.OnLoad(e); this.Example.Public = 10; // Restore Public value this.Example.NonPublic = 20; // Compile Error! } }

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• Going back to ASP.Net Webforms from ASP.Net MVC. Recommend patterns/architectures?

  - by jlnorsworthy

  To many of you this will sound like a ridiculous question, but I am asking because I have little to no experience with ASP.Net Webforms - I went straight to ASP.Net MVC. I am now working on a project where we are limited to .Net 2.0 and Visual Studio 2005. I liked the clean separation of concerns when working with ASP.Net MVC, and am looking for something to make webforms less unbearable. Are there any recommended patterns or practices for people who prefer asp.net MVC, but are stuck on .net 2.0 and visual studio 2005?

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• Recommended solutions for integrating iOS with .NET, at the service tier

  - by George

  I'm developing an application, in iOS, that is required to connect to my Windows Server to poll for new data, update, etc. As a seasoned C# developer, my first instinct is to start a new project in Visual Studio and select Web Service, letting my bias (and comfort level) dictate the service layer of my application. However, I don't want to be biased, and I don't base my decision on a service which I am very familiar with, at the cost of performance. I would like to know what other developers have had success using, and if there is a default standard for iOS service layer development? Are there protocols that are easier to consume than others within iOS? Better ones for the size and/or compression of data? Is there anything wrong with using SOAP? I know it's "big" in comparison to protocols like JSON.

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• Deploying an MVC 2.0 .Net 4.0 application to Windows Server 2003

  - by Brett Rigby

  I've spent the past couple of nights on this, and have come to the conclusions that I'm doing something wrong! Basically, I have my .Net 4.0 MVC 2.0 application deployed to my 2003 Server and it's constantly giving me the following error: The value for the 'compilerVersion' attribute in the provider options must be 'v4.0' or later if you are compiling for version 4.0 or later of the .NET Framework. To compile this Web application for version 3.5 or earlier of the .NET Framework, remove the 'targetFramework' attribute from the element of the Web.config file. I also have the .Net 3.5 MVC 1.0 application also deployed to the same server (from before the upgrade to .Net 4.0), and it works absolutely fine. I have re-run through Phil Haack's post on IIS6, making the necessary changes for .Net 4.0, but no luck. I have been through the steps in the British Developer's post too, but no joy. I have also tried the steps outlined in Johan's blog post, but the settings he mentions were already enabled. Obviously, I can't simply upgrade to a 2008 box, nor do I want to downgrade my software back to < 4.0 - any other ideas?

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• Custom Membership in ASP.NET MVC 2

  - by Interfector

  Hello, I'm trying to make my Custom Membership starting from ASP.NET's. I have a users table created by me which has as Primary Key a Guid UserId, exactly the sames as ASP.NET's default user and membership table. I have all the Foreign Key relationships built. However, I cannot insert the user into my custom users table. The data gets inserted correctly into the default ASP.NET's tables. I have tried the following scenarios: First version Receive the user model from POST call the CreateUser method of the Membership.class (stuff gets inserted) without modifying the user object, I try to insert it using EF's AddObject I receive the following error: "Cannot insert the value NULL into column 'LoweredUserName', table 'asp.dbo.aspnet_Users'; column does not allow nulls. INSERT fails.\r\nThe statement has been terminated."} System.Exception {System.Data.SqlClient.SqlException The error actually makes sense as EF's AddObject doesn't know how to create the LoweredUserName value, and I don't want to do it, this is ASP.NET's job. Second version Receive the user model from POST call the CreateUser method of the Membership.class (stuff gets inserted) Get the Guid of the freshly inserted system user get the ASP.NET's User object and overwrite that of user.User get the ASP.NET's Membership object and overwrite that of user.Membership (remember the FKs) try again EF's AddObject new error {"The relationship between the two objects cannot be defined because they are attached to different ObjectContext objects."} System.Exception {System.InvalidOperationException} Don't know what this is, but it certenly doesn't make any sense for me. After some googleing I think that it has something to do with the context, but as I'm a beginner I don't know how to fix it. Any ideeas on how to accomplish this task are more than welcomed, especially if they follow some good practices. Thx

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• Why is ASP.NET MVC Authorize attribute throwing a null reference exception?

  - by robertz

  I had a working asp.net mvc application running on my local IIS 7 web server, but now I'm getting errors whenever I request a page that requires authorization. I'm using standard forms authentication with asp.net membership. Here's the error: Stack Trace: [NullReferenceException: Object reference not set to an instance of an object.] System.Web.Mvc.AuthorizeAttribute.AuthorizeCore(HttpContextBase httpContext) +31 System.Web.Mvc.AuthorizeAttribute.OnAuthorization(AuthorizationContext filterContext) +38 System.Web.Mvc.ControllerActionInvoker.InvokeAuthorizationFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor) +103 System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +345...

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• Moving to ASP.NET MVC 2, prevent link text encoding in HtmlHelper.ActionLink method

  - by Giedrius

  Hi, I'm migrating to MVC 2 and I have a method: private MvcHtmlString WriteCategoryLink(CategoryViewData category) { var spanBuilder = new TagBuilder("span") {InnerHtml = category.Name}; return htmlHelper.ActionLink(spanBuilder.ToString(TagRenderMode.Normal), MVC.Category.Index()); } Problem is, that it encodes link text, but i don't want to, may be someone has a solution?

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• SFTP with .net 3.5?

  - by nrk

  I need to connect to sftp server to download & upload file using C# in .net 3.5. Is Microsoft/.net 3.5 framework providing any inbuilt tools/mechanism/library to connect to sftp server to download & upload files?

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• Does the default MVC security utilize the same security as ASP.NEt

  - by Matt

  I am converting a personal site over to MVC 2 and I have been using Forms Authentication against a SQL Server DB. Curious if the standard MVC 2 template will just automatically work if I upload it to the server. I have added the connection string to the web.config. I'm thinking it will work but wanted to see if anyone's done this.

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• asp.net mvc disable browser cache

  - by Palani

  I am looking for method to disable Browser Cache for entire ASP.Net MVC Website I found following method, Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache); Response.Cache.SetNoStore(); and also meta tag method, ( It wont work for me , since some MVC Actions send partial html/json through ajax, without head,meta tag ) <meta http-equiv="PRAGMA" content="NO-CACHE"> But i am looking for simple method, to disable browser cache for entire website.

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• How to implement Object Databases in Asp.net MVC

  - by amexn

  I started my project in Asp.net MVC(c#) & SQL Server 2005.I want to implement Object Databases in my project. While searched in google i found "MongoDb" & db4o I didn't have enough knowledge in Object Databases & which one best suited for SQL Server 2005. Please suggest a good example/reference regarding Object Databases implementation in Asp.net MVC application

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• How to implement Object Databases in Asp.net MVC(c#)

  - by amexn

  I started my project in Asp.net MVC(c#) & MSSQL 2005.I want to implement Object Databases in my project. While searched in google i found "MongoDb" I didn't have enough knowledge in Object Databases & which one best suited for MSSQL 2005. Please suggest a good example/reference regarding Object Databases implementation in Asp.net MVC application

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• Blowery HttpCompress with ASP.NET MVC

  - by Iceman

  I'm using the httpcompression module from blowery. It works great with asp.net mvc except on the root url, www.samplesite.com/. On all others it's great, www.samplesite.com/Countries for example. Is anyone here using this module or any other compression module with asp.net mvc ?

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• Most mature ASP.NET MVC Blog Engine?

  - by Tony_Henrich

  What's the best ASP.NET MVC based blog engine out there which is ready to deploy? I am guessing there are no MVC blog engines which are comparable with WebForms based blog engines like dasBlog, BlogEngine and subText? I think Oxite is a dead end and Orchid is more like a CMS. Looking for an engine which can do these: - RSS feeds support - anti comment spam functionality like support for Akismet - comment post approval support - Some kind of theming is possible

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• 404 in ASP.NET MVC with Integrated Pipeline mode

  - by David Martines

  IIS 7.0 (Shared Hosting) ASP.NET 2.0 Integrated Pipeline mode MVC 1.0 I get a 404 on every url except /default.aspx. I have this in my web.config: <system.webServer> <defaultDocument enabled="true"> <files> <clear /> <add value="Default.aspx" /> </files> </defaultDocument> <directoryBrowse enabled="false" /> <validation validateIntegratedModeConfiguration="false" /> <handlers> <add name="ScriptHandlerFactory_asmx" verb="*" path="*.asmx" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add name="ScriptHandlerFactory_axd" verb="*" path="*_AppService.axd" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add name="ScriptResourceHandler" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add name="MvcHttpHandler" verb="*" path="*.mvc" type="System.Web.Mvc.MvcHttpHandler, System.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add name="ErrorLogPageFactory" verb="POST,GET,HEAD" path="elmah.axd" type="Elmah.ErrorLogPageFactory, Elmah" /> </handlers> <modules runAllManagedModulesForAllRequests="true"> <remove name="ScriptModule" /> <remove name="UrlRoutingModule" /> <remove name="ErrorLog" /> <remove name="UnitOfWorkModule" /> <add name="ScriptModule" preCondition="managedHandler" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add name="UrlRoutingModule" type="System.Web.Routing.UrlRoutingModule, System.Web.Routing, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" /> <add name="UnitOfWorkModule" type="MusicCompany.Infrastructure.UnitOfWorkModule, MusicCompany.Infrastructure" /> <add name="ErrorLog" type="Elmah.ErrorLogModule, Elmah" /> </modules> The only unusual thing to me is the defaultDocument. It seems I need it because of the way the host (shared hosting) is set up (?) Any clues? Thanks

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• ASP.NET MVC, How to get the page content before render

  - by user361993

  In ASP.NET MVC, how to get the page content before render, we know in Web form app, we can override the method protected override void Render(HtmlTextWriter writer) to get the page content before render. but in MVC there are no event concept, so how we can get the page content. the purpose for that is to emphasize(wrap <strong> tag) the keywords before the page rendered. I'd appreciate for any advice. Thank you.

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