Problem while trying to use query.ToObservable()

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C#

WPF

LINQ

I am using Visual Studio 2010 Ultimate to create WPF app(.net 4.0) and I was going through the tutorial from pluralsight for .NET Reactive Extensions Fundamentals

http://www.pluralsight.com/training/Courses/TableOfContents/reactive-extensions[^]

An example of an WPF is shown where a simple button and readonly textbox is used when the button is clicked the text of textbox is appended with the numbers generated using Enumerable linq query. The application keeps responding without being dead because asynchronous task is performed.

The application adds reference of System.CoreEx, System.Observable and System.Reactive

and suppose a line of code is like

var query = from number in Enumerable.Range(1, 25) select number;

var observableQuery = query.ToObservable() // ToObservable() is not seen in intellisense

because I am unable to find and add reference.

I tried to search on google and also installed

Reactive Extensions from
http://www.microsoft.com/en-in/download/details.aspx?id=26649[^]

and


http://msdn.microsoft.com/en-us/data/gg577610[^]

but I was unable to find all dll files. I found System.Reactive in my system in

C:\Program Files (x86)\Microsoft Reactive Extensions SDK\v1.0.10621\Binaries\.NETFramework\v4.0

and while searching on google I read somewhere that System.CoreEx is now included in System.Reactive so its not required the remaining is System.Observable which I am unable to find.

So where can I find that dll or what do I need to install to get that dll. I even tried through nuget but unable to find.

If anybody could suggest where can get the System.Observable dll.