Linq return list of categories in order

I tried to search for this on Google/SO but I didn't really know what to search for!

Given:

tblCategories
-----------------
ID
Name
ParentID

And given say a category ID n how would we return it's parent开发者_Python百科 category, and the parent of it's parent etc, until ParentID = 0?

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There are plenty of other questions on this type of issue - try searching for "recursive linq query" - https://stackoverflow.com/search?q=recursive+linq+query

The general answers are:

• either fetch everything into memory and use something like AsHierarchy in Linq-to-Objects - see http://www.scip.be/index.php?Page=ArticlesNET18#AsHierarchy
• or write a CommonTableExpression in a stored procedure to help - http://msdn.microsoft.com/en-us/library/ms186243.aspx