ADB is not detecting the VS emulator ? ADB is disaplaying empty device list ?
$ ./adb.exe devices List of devices attached
Probably you are using the "adb" binary from a location that is different from what has been registered with windows.
Try the steps given bellow.
Step1: Figure out the SDK path that has been registered with windows.
run "regedit" from command propmt and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Android SDK Tools. Note down the value for "Path".