The LINQ DATACONTEXT is unfindable

Hello,
I was planning to use LINQ TO SQL to work with a new sql database I created. First I could not even find LINQ. Following the docs it should be in SYSTEM.DATA.LINQ but it was not. By accident I found that it was now in SYSTEM.LINQ. So I wanted to create the entry point to my database with the main tool DATACONTEXT. But to my wonder there is no Datacontext keyword available. So I installed all Nuget Packages that I thought that could contain it. But no luck. So where can I find it? And by the way what is the use of help docs that are outdated by a decade?

Thanks in advance,

Richard

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