CSHTML5 has now become OpenSilver!

We are happy to announce that CSHTML5 has been significantly improved and rebranded to 'OpenSilver', which stands for 'Open-source reimplementation of Silverlight'. It is fully backward compatible and it can be downloaded from Upgrading from CSHTML5 to OpenSilver is very easy.
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New Beta 7 of C#/XAML for HTML5 adds support for ResourceDictionary, Path, CompositeTransform, and much more!

Jan 27, 2016 — The beta 7 version of C#/XAML for HTML5 - the free Visual Studio extensions that enables developers to create HTML5 apps using only C# and XAML - is now available!

It can be downloaded for free from

Users who registered for one of the previous betas have received an email with the download link. If you have not received it, please contact us.

(The beta is limited to the first 10,000 downloads. Get it quickly!)

UPDATE: Beta 7.1 fixes the issues encountered with Beta 7.0 where the CSHTML5 Project Templates did not appear in the "New Project" dialog on non-English systems. It also fixes the issue that prevented the Calculator sample from working properly when compiled with VS 2015.  

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New features of the Beta 7 include:

  • Path, Ellipse, and Line controls
  • Support for ResourceDictionary, MergedDictionaries, and XAML files both with and without code-behind
  • Ability to reference any DLL compiled with CSHTML5 (Pro)
  • "Migration Tips" in the XAML Editor (for more easily migrating Silverlight and WPF projects to CSHTML5)
  • CompositeTransform, RotateTransform, ScaleTransform, SkewTransform...
  • DateTime.Parse, DateTime.TryParse, Boolean.Parse, and Boolean.TryParse
  • Support for system types in XAML (eg. <sys:Double>43</sys:Double>)
  • Support for direct content in <TextBlock>, <Color>, <FontFamily>, etc.
  • Shorter generated JS file names
  • Brush.Opacity
  • VisualTree.GetParent()
  • DependencyProperty.OverrideMetadata()
  • Char.IsUpper and Char.IsLower
  • IEnumerable.Last
  • Bug fixes:
    • Fixed WCF issue that prevented passing Integer and DateTime values via SOAP web services
    • Fixed "Path too long" errors when building an Android app using PhoneGap
    • Fixed "Path too long" errors during compilation
    • Fixed issue with browser caching that prevented the produced app from refreshing to the latest build
    • Fixed issues when referencing two assemblies with the same name but a different version or Full Qualified Name
    • Fixed issue where the Setup program could install some files to the wrong location
    • Uninstalling CSHTML5 now correctly removes the Project Templates and Item Templates
    • Removed warning when using CSHTML5 Item Templates for the first time
    • Removed misleading error messages that appeared when compilation failed
    • Removed warnings that were related to temporarily generated code
    • Other minor fixes. If you find any other issues, please report it on the forums or contact us at
Check out the updated Showcase app for new demos (Path, Ellipse, and Line controls).

Be sure to vote for your most wanted features on UserVoice.

Special offer:

80% Off

Get the Professional Edition - before the end of the Beta period - for only $99 instead of $499!

Lifetime license with 12 months of free updates!

30-day money back guarantee

Take advantage of this special offer! 

Migrating a Silverlight application to the web? Our team is here to help!

As you know, the future of Silverlight doesn't look very bright. Chrome, Edge, and mobile browsers do not support it, and Firefox has recently announced that it will stop supporting it in late 2016. If you have a Silverlight application, chances are that you are looking for a way to migrate it to other technologies.

If your app targets only Windows-based machines, and if deployment is not an issue for you, your best bet may be to migrate to WPF or UWP. However, if you want your app to run in the browser, or if you want to reach other platforms, you will likely find C#/XAML for HTML5 a compelling choice.

In fact, C#/XAML for HTML5 is the only solution that lets you reuse most of your SL code, keep coding in a Silverlight-like way, and at the same time generate cross-platform HTML5-based apps. Your apps run on any modern browser, without the user installing any plugins, and you can even package them for deployment on iOS and Android via PhoneGap/Cordova.

There are already tens of companies that are migrating their SL apps to the web using C#/XAML for HTML5. Our team is here to ensure that the migration progress goes well. If you need any assistance, please contact us.

We provide both Free Support and Professional Services. Depending on your needs, you may find that the Free Support is enough, or you may request a quote for Professional Services. Professional Services include expedited development of specific features just for you, assistance to migrate your apps, review of your app source code under NDA to list what is supported and what is not, or even migration of your entire app for you. Please contact us at

About C#/XAML for HTML5:

C#/XAML for HTML5 is a free extension for Visual Studio that enables developers to create cross-platform HTML5 apps exclusively using C# and XAML.

It is designed for developers using C#, XAML, and Visual Studio to extend application reach to platforms outside the Microsoft ecosystem, including Android, BlackBerry, Chromebook, iOS, Linux, Mac OS, and web browsers. It can be used to migrate Silverlight apps to HTML5, as well as to create new client-side rich web applications without manipulating HTML, CSS, and JavaScript.

Benefits over alternative cross-platform development tools include zero learning curve for C#/XAML developers, a robust well-organized strongly-typed development experience, the ability to share C# code between the client and the server, and the ability to port legacy apps to the modern web with minimal effort, notably to convert Silverlight apps to HTML.

More information and download can be found at:

About Userware:

Userware is a software company founded in 2007 by two experts in Microsoft technologies. It has gained popularity in the last years for consumer apps such as XLS Editor (#1 Paid Productivity App in the Windows Store for 8 consecutive months), and, a patent-pending online operating system made in Silverlight that can be enhanced Wiki-style by users using an online development environment. With "C#/XAML for HTML5", Userware aims to enable all C#/XAML developers to build cross-platform HTML5 apps with the skills, tools, and code base they already have.

Userware is online at:


You can contact the team behind C#/XAML for HTML5 at:


For more information, please visit