How do I use Union in linq (vb.net)?

I know how to call the Union extension method, e.g.

Dim r = productFirstChars.Union(customerFirstChars)

However I do I do this with开发者_高级运维 the Linq syntax, e.g.

from productFirstChars select ????

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You can't - not all LINQ operators are supported in query expressions, and Union is one of those that isn't. (VB has language support for more query operators than C#, as it happens.) See the documentation for a list of supported query clauses.