Something new in Visual Studio 2010 (Parallel LINQ) – part 2

Visual Studio 2010 supports Parallel Programming with .NET Framework 4.0. In order to do this the developer must choose .NET Framework 4.0 when creating a new project.

Try to run the following Parallel LINQ code below.

var source = Enumerable.Range(100, 20000);


// Result sequence might be out of order.

var parallelQuery = from num in source.AsParallel()

                    where num % 10 == 0

                    select num;


// Process result sequence in parallel

parallelQuery.ForAll((e) => DoSomething(e));


// Or use foreach to merge results first.

foreach (var n in parallelQuery)





// You can also use ToArray, ToList, etc

// as with LINQ to Objects.

var parallelQuery2 = (from num in source.AsParallel()

                          where num % 10 == 0

                          select num).ToArray();


// Method syntax is also supported

var parallelQuery3 = source.AsParallel().Where(n => n % 10 == 0).Select(n => n);

The AsParallel() method is actually doing the parallel task.

Download the complete code from The sample file name is “ConAppParallel.rar”. My MSN ID is

About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress ( till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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