All Posts

• Oct 10, 2020
  How to profile C# 9.0 Source Generators

  C# 9.0 source generators are progressing a lot lately, with the addition of generated symbols IDE navigation, as well as the stabilization of the generation APIs.

  As generators are run a part of the compiler’s pipeline, when creating small generators, or processing small inputs, performance profiling can be done quite easily, and even easier using Chris Sienkiewicz’s kittitas tool, which packages the generation driver inside a single, easy to use tool.

  Yet, when the build is more complex, or the solution takes an important environmental set of parameters (such as Directory.Build.props), some in-place debugging may be required.

  Read on to find out how to do this.

  Read more...

• Sep 13, 2020
  Using MSBuild Items and Properties in C# 9 Source Generators

  C# 9.0 Source Generation is progressing quite nicely lately (Thanks, Jared!), with the addition of the ability to interact with the MSBuild environment such as getting Properties and Items to control how the generation happens.

  In this post, I’ll explain how to parse .resw files of a project to generate an enum that contains all the resources.

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• Jul 19, 2020
  How to get the SyntaxNode of an ISymbol using Roslyn

  In this post, I’ll describe how to determine if a property is an auto-property, using its ISymbol as the source, and not by using reflection into Roslyn which computes this information internally.

  During the original development of the Uno CodeGen source generators, when building the Immutable generators (soon to be deprecated by the records feature in C# 9.0), we had to determine if a property’s backing field is generated or not.

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• Apr 29, 2020
  INotifyPropertyChanged with C# 9.0 Source Generators

  In a design meeting far, far away, source generators were designed to be part of C# 6.0, but sadly never came to be. At the time, wanting that source generation feature pretty badly, I went on implementing the specification which later became Uno.SourceGeneration, and it turns out it was the right decision to stick with a very similar API.

  I could port the INotifyPropertyChanged (INPC) generator I built a while back that uses Uno.SourceGeneration package, convert it to use Roslyn’s shiny new C# 9.0 feature in a matter of minutes. Amazing!

  Read more...

• Mar 22, 2020
  C# interop with C/C++ and Rust in WebAssembly

  Having the ability to call code written in other languages is increasingly important, as there are many very useful libraries that are getting ported over to WebAssembly. In .NET, the common defined way for doing interop is P/Invoke and DllImport, and .NET for WebAssembly has support for it in the form of static linking of LLVM Bitcode object files.

  In this article, I will walk through how to call some simple C/C++ and Rust code from C# in a WebAssembly app.

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• Feb 29, 2020
  .NET Threading and WebAssembly

  Threading, in general operating systems sense, is not something that the web has been able to use until very recently. The addition of Threads support in WebAssembly, and the activation of the threading support in Chrome opens up a whole new world of possibilities, including the use of Reactive Extensions (Rx.NET) or the Task Parallel Library (TPL).

  Let’s dive in, with some sample code.

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• Dec 8, 2019
  Roslyn Source Generation Reborn, the replace keyword and INotifyPropertyChanged

  A very long time ago, during the C# 6.0 time frame, a Source Generation proposal was added to the list of possible features, it was abandoned, but in a recent PR, the Roslyn team is taking a look again at the feature proposal, as there are lots of generation happen around Microsoft that could benefit from an integrated story.

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• Dec 1, 2019
  MVP 2020-2021

  What a year!

  I’ve been doing full Open Source work for the past year and a half, giving talks about .NET, Xamarin, Mono and WebAssembly, contributing to open source projects, and Microsoft noticed!

  I’ve been awarded MVP by Microsoft for 2020-2021 for the Developer Technologies, 8 years after being a “Visual C#” MVP from 2009 to 2011.

  I’d like to personally thank the amazing MVPs that supported me through this process, Sébastien Lachance, Jim Wilcox, Geoffrey Huntley, as well as Microsoft employees (Thanks Clint, Karel, Rochelle, Jesus, Ryan, Betsy).

  I’m glad to be back as an MVP, and off to a new year with this great community!

  Read more...

• Jun 29, 2019
  NuGet, Visual Studio 2019 Solution Filters and Large Cross-targeted Solutions

  The combination of the Visual Studio solution filtering and NuGet support for it allows for faster trimmed-down solution loading. This enables developers of large cross-targeted solutions to have a viable environment by temporarily focusing on a single target framework, and still have Visual Studio cooperate.

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• Mar 31, 2019
  Using the Span<T> in Xamarin Cross-Targeted projects

  System.Memory exists to provide the Span<T>, Memory<T> and similar types, for which C# 7.x provided support, and it can enable significant performance improvements where appropriate. While .NET Standard 2.0 does not have support for it in its available API surface, there the System.Memory NuGet package that can be added to enable it.

  As part of the code sharing effort, Mono and Xamarin added support for System.Memory in the BCL as part of the releases bundled with VS 2019.

  While this is a very important step to make Mono and .NET Core very similar in behavior, this brings issues because the Xamarin.iOS, Xamarin.Mac and MonoAndroid target frameworks are not versioned like .NET Core or .NET Standard. The Visual Studio version used to build a project has an impact on the code’s behavior or compatibility that cannot be adjusted as easily as changing a Target Framework version.

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• Mar 21, 2019
  Using Containers in Azure Devops to Build Mono Apps

  The Azure Devops team recently added a new feature that gives the ability to run a build definition inside of a container pull from the Docker Hub. That container is running directly on the build host, executing the steps of the definition.

  As I’ve been battling recently to get the Uno Platform Wasm-AOT Linux builds to run in a consistent context, without having to much to maintain. Mono-wasm comes with an AOT toolchain that only works on Ubuntu 18.04, and Azure DevOps hosted agents only provide Ubuntu 16.04.

  This container support feature comes in handy to build in the appropriate environment!

  Read more...

• Mar 4, 2019
  Improving C# Source Generation Performance with a Custom Roslyn Workspace

  In my previous article about the process of improving the source generation performance, I mentioned some improvements around the generation inside of an AppDomain for an improved isolation, inside of an out-of-process generation host.

  It turned out to be problematic on both the memory consumption side, as well as on the cold start cost of creating a host, which I’ll talk about in a later post.

  This quest for the generation performance also led me to rethink the use of the MSBuildWorkspace class. It completely hides the MSBuild object model created to build the Roslyn Compilation object. These MSBuild project instances also need to be provided to the source generators to get access to the code being built, forcing a double parsing and loading of a project file.

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• Jan 25, 2019
  Create a BuildReference Dependency Between C# Sdk-Style Projects

  I know, a BuildReference does not exist. But it really should.

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• Jan 18, 2019
  Chasing an MSBuild task devenv.exe file lock

  During the development of an Uno Platform build task for generating platform specific resources, I found out that invoking the MSBuild task with the BuildInParallel property set to true works around a task assembly locking issue.

  For some (yet) unknown reason, even if Visual Studio is scheduling most of its work to child msbuild.exe processes, when using the new SDK style project format on large projects, the devenv.exe process gets used to build project outputs. This forces the developer to close the IDE and delete the task assembly to rebuild it again, and work around a file not found caching issue…

  In this article, I will be discussing the solutions I explored to mitigate this issue.

  Read more...

• Jan 6, 2019
  Improving out-of-process C# Source Generation performance

  It’s been a very long while since I’ve blogged, and a number of factors had reduced my time and ability to write about what I was working on for these past years. Now that most of what I work on is public through the Uno Platform, I’ll be spending some time writing in depth articles about some technical aspects, but also a bit about IoT, a very fast-paced area these days.

  Happy new year!

  For starting up blogging again, I’ll be discussing the implementation of the Uno.SourceGenerationTasks project, a source generation framework that allows for NuGet-distributable source generators, in the same way roslyn allows for distributable analyzers.

  People have recently been talking about it on twitter, and I figured I could talk a bit more about the path the implementation took to this day.

  Read more...

• Feb 19, 2014
  Controlling actual Thread Priority in WinRT and Windows Phone

  tl;dr: Setting the WorkItemPriority in ThreadPool.RunAsync actually changes the thread priority the code runs on, not just the position in the pending work queue.

  It’s been a while since I’ve blogged, but this entry has been a finding that had long eluded me and this was a good chance to blog again. If you’re still reading, thanks :)

  In the Plain Old (or might I say, complete) .NET framework, there was a pretty useful property named Thread.Priority, which gave a lot of control to app developers. This allowed a very control of what would run, where, and how.

  Using this API, you could have CPU bound (hence blocking) code that could run at a very low priority, without the need to be yielded somehow, like it’s suggested now with async and Task.Yield().

  I was under the impression, since Windows Phone 8.0 and WinRT 8.0 have been introduced, that there was no available way to control the actual thread priority, since either the property does not exist, or even Thread does not exist anymore.

  The suggested counterpart, Task, does not provide such a feature, leaving developers no choice but chunking the work, by using clever tricks or work item priority scheduling.

  Read more...

• Apr 23, 2013
  Immutable Data and Memoization in C#, Part 2

  tl;dr: Memoization can be associated with the ConditionalWeakTable class, which allows the addition of memoized computation results to immutable types. This makes the memoized results live as long as the instances that was used to create it.

   

  In the first part of this article, we discussed a bit the Memoization pattern in C#. In this second part, we will discuss how to alleviate the memory management issue for memoized computation results.

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• Apr 19, 2013
  Immutable Data and Memoization in C#, Part 1

  TL;DR: Immutable data and memoization are functional programming concepts that can be applied to C# programming. These patterns have their strengths and weaknesses, discussed a bit in this article. 

   

  I’ve grown to not being a great fan a data mutability.

  Data mutability can introduce a lot of side effects in the code, and it can be pretty complex to go back in time to know what a specific state was before the code failed. This gets worse when multiple threads are involved, and that tends to happen a lot more these days, now that even phones have multiple cores.

  Sure, we can use IntelliTrace to ease that kind of debugging, but that’s pretty much limited to issues you already know about. That means you’re reacting to issues that already happened, you’re not proactively preventing those issues from happening.

  So, to address this more reliably, there’s the concept of immutability. When a set of data is built, it cannot change anymore. This means that you can pass it around, do computation with it, use it any place you want, there’s not going to be any subtle concurrency issues because the data changed under your feet.

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• Apr 17, 2013
  Cancellation with Async F#, C# and the Reactive Extensions

  TL;DR: C# 5.0 async/await does not include the implicit support for cancellation, and needs to pass CancellationToken instances to every async method. F# and the Reactive Extensions offer solutions to this problem, with both implicit and explicit support for cancellation.

   

  My development style has slowly shifted to a more functional approach, during the past year. I’ve been peeking a F# for a while and that shift to a more functional mindset in C# lends me toward understanding a lot better the concepts behind core features of F#, and more specifically the async “support” in F#.

  It’s known that F# inspired a lot the implementation of C# async, but having looked at the way it’s been implemented in F# gives me some more points against the “unfinished” implementation in C#.

   

  Recently, now that people are effectively using async, in real-world scenarios, problems are starting to bubble up, and some to giggle. Async void, async void lambdas, the fact that continuations run mostly on the UI thread when not taken care of properly, obscure exception handling scenarios, the “magic” relation to the SynchronizationContext, that it does not address parallelism, and one that’s been pretty low-key, cancellation.

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• Mar 30, 2013
  Building in Parallel Across Multiple Build Agents in TFS2012 for Metro Apps

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• Mar 30, 2013
  [VS2012] Temporarily disable the C# static code analysis for a whole VS instance

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• Feb 5, 2013
  Writing a Xaml attached property in C++/CX to resize Images, with a Performance twist

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• Feb 2, 2013
  On the Performance of WinRT/Xaml Template Expansion

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• Jan 23, 2013
  An RxJS to Rx.NET bridge

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• Jan 13, 2013
  ReaderWriterLockSlim on Windows Phone 8 and the seemingly random MethodAccessException

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• Jan 3, 2013
  Toying around with F# Queries, Rx, Portables Libraries, Windows [Phone] 8 and the Zip operator

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• Dec 20, 2012
  Reading the content of the Xap/Appx and IsoStore in Windows [Phone] 8

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• Nov 27, 2012
  DataBinding performance in WinRT and the Bindable attribute

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• Nov 25, 2012
  Reducing apps startup time with Pre-JITing and NGEN on a Surface RT

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• Oct 30, 2012
  Windows Phone 8 SDK Round-up

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• Oct 27, 2012
  Of Static Code Analysis, CA0001, WinMD files and C# Dynamic in Metro Style apps

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• Oct 27, 2012
  Configuring Multiple TFS 2012 Build Services on one Machine

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• Oct 11, 2012
  Implementing an asynchronous settings service, Part 3 : Getting notified

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• Oct 9, 2012
  Implementing an asynchronous settings service, Part 2 : Writing a setting

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• Oct 8, 2012
  Implementing an asynchronous settings service, Part 1 : Going Async

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• Sep 30, 2012
  C# Async Tips and Tricks, Part 3: Tasks and the Synchronization Context

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• Sep 26, 2012
  VS2012: Create multiple file links with a drag and drop between two projects

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• Sep 26, 2012
  VS2012: How to change a project’s physical location

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• Aug 27, 2012
  An update to @matthieumezil, Rx and the FileSystemWatcher

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• Jul 14, 2012
  Windows 8, Developers, Hyper-V and the new VHDX format

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• Jul 8, 2012
  C# Async Tips and Tricks Part 2 : Async Void

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• Jun 19, 2012
  C# 5.0 Async Tips and Tricks, Part 1

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• Jun 11, 2012
  Improving the Startup Time of Xaml Metro Style Apps with Multicore JIT

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• Mar 17, 2012
  No Threads for you ! (in metro style apps)

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• Mar 17, 2012
  Windows 8 Event Viewer’s Immersive-Shell and Metro Style apps

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• Mar 8, 2012
  Xaml integration with WinRT and the IXamlMetadataProvider interface

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• Mar 4, 2012
  Switching a Windows 8 Consumer Preview from a VHD to Hyper-V

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• Dec 3, 2011
  [WPDev] The hidden cost of IL Jitting

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• Nov 26, 2011
  NuGet package customizations and optional references

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• Nov 26, 2011
  Asynchronous Programming with the Reactive Extensions (while waiting for async/await)

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• Oct 17, 2011
  WinRT and the syntactic sugar around .NET event handlers

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• Oct 2, 2011
  MVP 2011 !

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• Sep 29, 2011
  [wpdev] Tips and tricks about updating live tiles in Mango

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• Sep 21, 2011
  [WP7Dev] Diagnosing StackOverflowExceptions, or the lack thereof

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• Aug 20, 2011
  [wp7dev] Images and cache control in Windows Phone 7.1 (Mango)

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• Aug 4, 2011
  To be fair when comparing Rx to C# 5.0 Async...

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• Jul 29, 2011
  [wp7dev] Error code 0xc00cee65 and duplicate XML namespaces

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• Jul 26, 2011
  When declarativeness goes away for performance

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• Jul 25, 2011
  Why using a timer may not be the best idea

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• Jul 25, 2011
  [Rx] Using the ObserveOn and SubscribeOn operators

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• May 1, 2011
  Team Build and Windows Phone 7

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• Apr 22, 2011
  [WP7] HttpWebRequest and the Flickr app 'Black Screen' issue

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• Apr 22, 2011
  [WP7] A nasty concurrency bug in the bundled Reactive Extensions

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• Apr 4, 2011
  [Reactive] Being fluent with CompositeDisposable and DisposeWith

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• Mar 27, 2011
  [WP7Dev] Double tap when you expect only one

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• Mar 24, 2011
  A bit of IT in developer's world: services.exe high CPU usage

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• Dec 15, 2010
  Virtual Machines, Snapshots, Automated Tests and Machine Trust Account

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• Sep 7, 2010
  [WP7Dev][Reactive] Safer Reactive Extensions

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• Jul 31, 2010
  [WP7] Using an Exchange Account With a Custom Certificate

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• Jul 26, 2010
  Revisited with the Reactive Extensions: DataBinding and Updates from multiple Threads

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• Jul 23, 2010
  Using the Remote Debugger

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• Jul 18, 2010
  Version Properly using AssemblyVersion and AssemblyFileVersion

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• Jul 5, 2010
  [VS2010] On the Impacts of Debugging with “Just My Code”

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• Jun 29, 2010
  Hyper-V VM Mover 1.0.2.0 on CodePlex

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• Jun 23, 2010
  [WP7Dev] Using the WebClient with Reactive Extensions for Effective Asynchronous Downloads

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• Jun 20, 2010
  [WP7Dev] Beware of the [ThreadStatic] attribute on Silverlight for Windows Phone 7

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• Jun 13, 2010
  [VS2010] How to disable the Power Tools Ctrl+Click Go to Definition

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• Jun 11, 2010
  [LINQ] Finding the next available file name

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• Jun 4, 2010
  Thoughts on Migrating from WSS 3.0 to SharePoint Foundation 2010

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• Apr 10, 2010
  Remote Control for PowerPoint 1.0 !

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• Mar 6, 2010
  [VS2010] Configure Code Analysis for the Whole Solution

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• Feb 4, 2010
  Reactive Framework: MemoizeAll

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• Jan 3, 2010
  WinForms, DataBinding and Updates from multiple Threads

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• Dec 2, 2009
  SharePoint WebDAV, IIS 7.5 and Windows Server 2008 R2

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• Nov 9, 2009
  Some news about Remote Control for Windows Mobile

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• Oct 24, 2009
  [VS2010] “Object reference not set to an instance of an object” when opening a file

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• Oct 15, 2009
  Hyper-V, CPU Load and System Clock Drift

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• Aug 9, 2009
  On the Startup Performance of a WPF ElementHost in Winforms

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• Jul 11, 2009
  WCF Streamed Transfers, IIS6 and IIS7 HTTP KeepAlive

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• May 27, 2009
  Working with Bill Graziano's ClearTrace to optimize SQL queries

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• May 17, 2009
  A C# Traverse extension method, with an F# detour

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• May 10, 2009
  Hyper-V Virtual Machine Mover 1.0.2.0

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• Apr 1, 2009
  SharePoint : The database connection string is not available. (0xc0041228)

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• Mar 28, 2009
  Hyper-V Virtual Machine Mover and Hyper-V Server

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• Mar 16, 2009
  Google Transit and Montreal's STM

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• Feb 21, 2009
  A tool to move an Hyper-V Virtual Machine without exporting it

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• Dec 6, 2008
  Using Multiple Where Clauses in a LINQ Query

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• Dec 6, 2008
  F#, TryWith, Maybe and Umbrella

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• Nov 21, 2008
  Local Variables in Lambda Expressions

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• Nov 19, 2008
  Lambda Expression and ForEach loops

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• Nov 8, 2008
  Working with Umbrella in .NET 3.5

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• Nov 4, 2008
  Speaker Idol Montreal

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• Nov 1, 2008
  Montréal Bus Stop Locator Site and the iPhone

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• Oct 16, 2008
  How to convert a (big) VMWare VMDK into an Hyper-V VHD

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• Sep 7, 2008
  Pocket IE and Setting IMG Src via JavaScript

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• Sep 7, 2008
  Montreal Bus Stop Locator Site Updates

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• Sep 2, 2008
  .NET 2.0 InternalsVisibleTo Attribute and Unsigned Assemblies

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• Sep 1, 2008
  Using Google Gears to find Montreal's Bus Stops

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• May 14, 2008
  ILogicalThreadAffinative, again.

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• May 10, 2008
  IEnumerable<T>.Any() vs. IEnumerable<T>.Count() != 0

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• Apr 26, 2008
  A look at Linq to objects and the 'let' keyword

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• Apr 14, 2008
  Canadian Mobile Data Plans

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• Apr 7, 2008
  A bug in VS2008 Code Analysis, Generics normal and nested classes

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• Apr 1, 2008
  Bluetooth Remote Control 0.9.0, Round 2

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• Mar 31, 2008
  Bluetooth Remote Control for Windows Mobile 0.9.0

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• Mar 26, 2008
  Using a real USB bluetooth device in Virtual PC 2007

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• Mar 24, 2008
  Windows Server 2008 and Microsoft Bluetooth Stack trouble

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• Mar 23, 2008
  Prevent ASP.NET web.config inheritance, and inheritInChildApplications attribute

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• Mar 17, 2008
  Visual Studio 2008 Solution Tree Items Collapse

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• Mar 16, 2008
  Blog Update

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• Feb 11, 2008
  .NET Threads, CallContext and ILogicalThreadAffinative

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• Jan 15, 2008
  Some news on Bluetooth Remote Control for Windows Mobile

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• Dec 25, 2007
  Bluetooth Remote Control 0.8.5

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• Dec 12, 2007
  Visual Studio 2008 Presentation in Montréal

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• Dec 11, 2007
  Visual Studio 2008 : Where is my Solution Explorer item sort gone ?

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• Dec 10, 2007
  The (non generic) System.Action delegate

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• Dec 10, 2007
  Bluetooth Remote Control 0.8.4

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• Dec 5, 2007
  Snow in Montréal, QC

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• Oct 26, 2007
  Additional Bluetooth Drivers for Microsoft Bluetooth in Windows XP SP2

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• Oct 19, 2007
  News from Montréal

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• Sep 10, 2007
  Bluetooth Remote Control 0.8.3 - Broadcom Bluetooth Support for Windows Mobile

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• Sep 5, 2007
  Broadcom/Widcomm Bluetooth Stack and SetSecurityLevel

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• Aug 31, 2007
  Canada !

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• Aug 29, 2007
  Binding a C# property to a WPF validated Control

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• Aug 25, 2007
  0.8.2 Re-Release

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• Aug 22, 2007
  Bluetooth Remote Control 0.8.2

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• Aug 15, 2007
  Pictures

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• Jul 26, 2007
  Google, Sitemaps, Multi-Culture, and ASP.NET

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• Jul 23, 2007
  Bluetooth Remote Control 0.8.1

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• Jun 19, 2007
  No files were found to look in. Find was stopped in progress in VS2005

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• Jun 10, 2007
  Bluetooth Remote Control Forum

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• Jun 9, 2007
  Bluetooth Remote Control 0.8.0-Beta1

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• Jun 3, 2007
  Bluetooth Remote Control and Incoming Calls

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• May 26, 2007
  Vista's Sound Mixer in Bluetooth Remote Control

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• Apr 16, 2007
  WCF, NuSOAP and ArrayOfString

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• Apr 15, 2007
  WCF WebService behind a NAT Gateway

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• Apr 7, 2007
  Unprotecting Protected Processes

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• Apr 7, 2007
  Vista's Support for External Displays

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• Mar 17, 2007
  Remote Control 0.7.0-Beta2

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• Mar 8, 2007
  Bluetooth Remote Control for Windows Mobile 0.7.0-Beta1 : Widcomm Support

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• Mar 7, 2007
  Support for Widcomm Stack on the Way !

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• Mar 5, 2007
  Spending some time in Montréal, QC, CA

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• Feb 26, 2007
  Rest in Peace, TuO

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• Feb 19, 2007
  Atlantic Shores of France

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• Feb 16, 2007
  WPF DataBinding and Application Settings

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• Feb 13, 2007
  WPF DataContext and CurrentItem

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• Feb 11, 2007
  Small blog update, with Url Rewriting

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• Feb 7, 2007
  Sebastien Laban's new website

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• Feb 7, 2007
  The file is not a valid Windows CE Setup file

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• Jan 31, 2007
  Vista Versions and Confusion

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• Jan 30, 2007
  Vista's Reliability Monitor in year 1970

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• Jan 30, 2007
  WPF, Xml namespace and XmlDataProvider

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• Jan 26, 2007
  Bluetooth Remote Control 0.6.0

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• Jan 25, 2007
  Playing with WCF and NuSOAP 0.7.2

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• Jan 24, 2007
  Some news

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• Dec 22, 2006
  ODP.NET 10.2.0.2.20 Connection Pool Race Condition

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• Sep 2, 2006
  IIS, HTTP 401.3 and ASP.NET directories ACLs

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• Jul 26, 2006
  Bluetooth Remote Control 0.5.0-Beta5

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• Jul 22, 2006
  C# 3.0, a sneak peek

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• May 27, 2006
  BTRemote Control and Windows XP 64 Bits

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• Nov 18, 2005
  Precision Timer in .NET 2.0

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• Apr 4, 2005
  Reflective Visitor using C#

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• Apr 4, 2005
  C# 2.0, Closures and Anonymous Delegates

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• Feb 22, 2005
  BartPE using PXE, Again...

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• Dec 15, 2004
  Mono 1.0.5 support for NetBSD 2.0

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• Dec 13, 2004
  ASP.NET Remote Debugging, Windows XP SP2 and .NET Framework 2.0

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• Oct 13, 2004
  Inter-Domain Trust Relationship and lmhosts Text Casing

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• Oct 8, 2004
  Multiple MassStorage Drivers with Windows 2000/XP/2003 and INACCESSIBLE_BOOT_DEVICE

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• Aug 16, 2004
  The Disposable Pattern, Determinism in the .NET World

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• Aug 5, 2004
  Don't get C# volatile the wrong way

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• Apr 14, 2004
  Obscure abstraction stories

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• Apr 4, 2004
  SyncProxy, an implicit synchronizer

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• Apr 2, 2004
  Windows Installer CleanUp Utility

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• Mar 1, 2004
  Using Precompiled Headers

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• Feb 3, 2004
  SEH et Exceptions en C++

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