Yes, it's (still available). No, it isn't (deprecated).
Why the question?
A link on the argument http://architecturebyashwani.blogspot.com/2010/02/foreground-gc-and-background-gc.html
There is even a new GC (background for workstation mode) in 4.0, so in the end there are three GC; server, workstation concurrent on, workstation concurrent off.
The three settings for web.config
/app.config
are:
<configuration>
<runtime>
<gcConcurrent enabled="false"/>
<!-- or -->
<gcConcurrent enabled="true"/>
<!-- or -->
<gcServer enabled="true"/>
</runtime>
</configuration>
The three or
are "exclusive". You can enable only ONE option at a time :-)
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