omervk.com

This is a short, off-topic rant.

As I do from time to time, here is a batch of three Extension Methods I’ve written recently:… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

Tamir hates lambdas.

I just finished debugging a very annoying error, where I kept getting a ChangeConflictException with the message “Row not found or changed” while trying to update my data.

Sometimes you want to use FirstOrDefault, but the default value of T is a valid value that might get returned.

I’ve updated my long standing Linq Extensions project on CodePlex to .NET 3.5 RTM and added the latest extension methods….

Enumerating over a Dictionary<TKey, TValue> you will get structs of type KeyValuePair<TKey, TValue>.

Here’s another Linq method I wanted to share.

One of the first things I noticed when I started debugging our web application was that at load I got an insane amount of these:… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

[This is a summarization post for my international audience; For a more complete coverage, see my and many other bloggers’ impressions at Microsoft Israel’s blogosphere]… You can read the copy of the original post, or if that goes down too, you can try the

I’d love to see this become a reality in the next version of Visual Studio:… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

I’ve created a couple of useful extension methods that I like to use with Linq, so here they are:… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

The Basic Need… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

I’ve been messing with SQL Server’s Analysis Services and have spent my first couple of weeks at Nuconomy working on an MDX DOM.

After … You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

Got an exception being thrown with only its name being displayed in the output window?

Dependency Properties and Routed Events are special WPF mechanisms that can be used in place of the CLR’s normal Properties and Events, since they are more powerful, although less typed.

I don’t use GMail as my primary address, but it’s a very useful service.

[Caveat: This is constructive criticism about XAML and the current version of WPF.

Here’s a collection of performance related information I find useful:… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

You can look up for prefixed members, using reflection, by placing an asterisk after the prefix:… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

Whenever I teach classes or do demos, I get asked about the C# code snippets I use in Visual Studio, so I decided to release them, if anyone would like to use them….

After realizing the project I’m working on is in need of two features that do not exist in WPF – one being a missing feature, the other being a bug – I decided to take action and write something that would allow one to write code that is currently an unsu…

… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

Delegate Contravariance is a really cool feature in C# that is often overlooked, mostly because it is so implicit and “obvious”.

I encountered a problem today, the solution to which some of you may find worth keeping note of….

I just finished a short conversation with Aaron Randall from London who used the little Windows Live Messenger Flash application in my sidebar (oh, how I love thee, Internets) to ask me a question he had about linked lists after reading one of my posts:……

While writing a reusable component for a client, I placed it in a different assembly and began to change all of the non-public classes’ access modifiers to internal.

There are quite a few sources about how to create dynamic menus (menus that are not embedded in XAML or code, but rather loaded from an external file):… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s

Building on the work started by William Kempf, I set out to make using the WeakEvent Pattern simpler and more readable.

You can’t….

Haven’t you always wanted to use a combo box like the one in Start menu’s Run dialog?

Sometimes you want to know a type’s exact namespace and assembly (for instance, in order to find it in Reflector).

If you have a nested type, VS2008 beta 2’s designer will tell you that you can’t reference it using x:Type, stating that “Type X was not found.”… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy…

public static void Do(this TBase value) where T : BaseClass… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

DO NOT return null values from collection properties or from methods returning collections.

Came up with a nice idea while driving today about versioning enums….

After reading Jafar Husain‘s posts (1, 2 and bonus by Doron Yaacoby), I started thinking about being able to strong type names using the Expression classes….

Ever wondered how to switch between the Cider Designer’s views (Designer and XAML) in Visual Studio 2008 using the keyboard?

Sebastien Lambla wrote a cool post about how to correctly get notifications for the changes in dependency property values….

Version 1.0 of the .NET Framework introduced System.Drawing.Region‘s Union method, designed to union two regions or several other types into a region.

Some of the work on my current project requires accurately timing events, at a frequency of a few dozen per second (that means that each event has to follow the previous one within a few milliseconds).

Just stumbled onto an exotic bug in the framework:… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

As much as I love the idea behind extension methods, I can’t help but start to think about how it could be used for malicious purposes….

I’ve had my fair share of disappointments when I found that the closest common denominator between types I wanted to use was object, leading me to write code in a level I did not like, like:… You can read the copy of the original post, or if that goes down

The example of anonymous types from the C# 3.0 specification document is as follows:… You can read the copy of the original post, or if that goes down too, you can try the Wayback Machine’s copy of it.

A little known, as far as I can tell from asking around, yet extremely useful property in the Windows Forms designer’s property grid is GenerateMember….

Even though I arrived late to the IVBUG/IVCUG meeting today, I can say it was great listening to the lectures and talking to both Inbar Gazit and Lisa Feigenbaum….

Jackie has published a special IVBUG / IVCUG meeting on April 12.

A colleague was baffled by having Control.Invoke (when called from a different thread) throw an ArgumentException at him and asked if I knew what was happening.