acadApp.sendCommand("\x03\x03") not working on AutoCAD 2016

[Anonymous]

acadApp.sendCommand("\x03\x03") not working on AutoCAD 2016 while it is working on AutoCAD 2014. 

When I run C# code with this command in 2016 it throws following exception:
"exeption has been thrown by the target of an invocation"

Thanks.