Intellisense for LINQ methods on strings not working?

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The LINQ extension methods don't seem to be getting found on strings by IntelliSense. Seems to work fine in VS2015.

Compare these two screenshots:

http://i.imgur.com/KfOjzuT.png
http://i.imgur.com/WazmzHM.png

That shows that:

a) the extension methods work, even though Intellisense can't find them;
b) Intellisense finds the extension methods on arrays

It also finds the extension methods on Lists.

Anyone know what the problem is here?

Many thanks!

Charles

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