arduino micro communicate with labview

Hello everyone,
I have to communicate LabVIEW with Arduino micro.
When I send a information through Serial.println("11"); to LabVIEW, it works
But when LabVIEW send something back to my micro Arduino, it doesn't work
However, when I used Arduino uno with the same program, I could send and receive program without any problem.
Could any one help me thanks