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CCing @232 because I know they love code tags:
232:
The solution to the errors you got is to change this line:
EthernetUDP = Udp;// To send & receive packets using UDP
to:
EthernetUDP Udp;// To send & receive packets using UDP
Next you will encounter some new errors about Udp.send(). There is no such function. I recommend you to start with File > Examples > Ethernet2 > UDPSendReceiveString, the associated tutorial:
https://www.arduino.cc/en/Tutorial/UDPSendReceiveString
and the library reference:
Note that you send UDP packets in a three part process. First Udp.beginPacket(), then Udp.write(), then Udp.endPacket().