>>I see the same behavour in VS2008 and VS2010 (VB and C#) : If the search expression exists in a collapsed region then the region is expanded. Personally I'd think any other behaviour would be a nightmare - most of the time you would have to manually expand all collapsed regions prior to a search to be sure of not missing something.....
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>This Region section is useless for me. I never go in there. And, I would never want to search in it. At least, if I could disable that section, it would be better.

You could always move that portion out of the file into a partial class.
Tim