Disable Wireless on Wired LAN Connection

Hi,
Right Now, my macbook pro use my ethernet and my wifi at the same time and i don't want that. Is there a way to say to my macbook pro to stay only with my ethernet connection when my cable is plug in it and no wifi come by? (I travel a lot with my mac and i cannot just do Turn Off / ON Wifi each time i plug ny cable in my mac)
Thanks in advance

The issue with what everyone suggests is that your computer STILL obtains 2 IP addresses. If you have 4 laptops in the family thats 8 IP's.. if you're in a workplace of 30 people thats 60 IP's for 30 systems.. doesn't matter if they are being 'used' or not. it's a huge waste of network resource.
Thats a HORRIBLE way to manage your resources. Plus, it wastes battery maintaining a connection it doesn't use.. Thats just silly! Apple truly does need to address this.. Even Dell laptops disable wireless connectivity (turns wifi on for GPS as needed, but keeps from connecting) while wired is connected.

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