+2  A: 

Not on my copy of Visual Studio (that's 2010, with ReSharper installed):

alt text

Perhaps you forgot the using System.Linq; at the top? Or maybe ReSharper is adding them, not sure...

Dean Harding  2010-07-04 09:56:13
I edited my question. I'm using VS2008 and I have "using System.Linq" at the top.
digEmAll  2010-07-04 10:00:06

related questions

How to find an implementation of a C# interface in the current assembly with a specific name?
Learning about LINQ
LINQ to SQL Mapping From Money to Double
SQL Server 2008 vs 2005 Linq integration
Aging Data Structure in C#
LINQ-to-SQL vs stored procedures?
LINQ, entity that implements Interface and exception in mapping
How can I remove nodes from a SiteMapNodeCollection?
Conditional Linq Queries
LINQ query on a DataTable
Expression.Invoke in Entity Framework?
How to return a page of results from SQL?
Import Namespace System.Query
Has anyone run performance benchmarks comparing LINQ
Beginners Guide to LINQ
Querying like Linq when you don't have Linq.
Linq to objects - select first object
C# 3.0 Where extension method with lambda vs LINQtoObjects to filter in memory collections.
How much database performance overhead when using LINQ?
LinqDataSource - Can you limit the amount of records returned?
LINQ on the .NET 2.0 Runtime
How do I most elegantly express left join with aggregate SQL as LINQ query
How do you page a collection with LINQ?
How do I get a distinct, ordered list of names from a DataTable using Linq
How do I fill a DataSet or a DataTable from a LINQ query resultset ?