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Re:.NET Framework 4.6.2 by perezdev on Wednesday August 03, 2016 @05:12AM (#12216686)
It's the null propagation operator.
Re:.NET Framework 4.6.2 by breischl on Wednesday August 03, 2016 @11:32AM (#12218667)
Look, if you want to be pedantic it's the null conditional operator[1]. But it is widely called the "Elvis operator"[2].

[1] - https://msdn.microsoft.com/en-us/library/dn986595.aspx

[2] - https://www.google.com/#q=c%23+elvis+operator