A few quick things:
1. Netduino's analog inputs are 3.3V (instead of 5.0V). Power the temperature sensor from the 3.3V power header instead of the 5.0V power header.
2. The ARM chip on the Netduino (Rev A) does not have an internal analog reference (unlike the AVR used on the Arduino)--so you'll need to wire the 3.3V power header to the AREF pin header.
Other than that, I believe you should be good to go!
Thanks for you help, I should have caught that by doing a little reading. I will make the changes and try that again tonight. I will let everyone know the outcome.