I got the following message when building PIACE with PISDK with target framework 4.0.
This message will not show up with target framework 3.5.
But a newly updated DLL used in the reference requires framework 4.0.
Because the above change PIACE debug indicated "Load Assembling Failed".
"A reference was created to embedded interop assembly 'OSIsoft.PISDK' because of an indirect reference to that assembly from assembly 'OSISoft.PIACENet'. Consider changing the 'Embed Interop Types' property on either assembly. "