Nad1983UTMZone17N

[IgressT]

Hi ,
My data in the Silverlight app is in Nad1983UTMZone17N. However, we have a webservice that perfoms some  calculation based on latitude and longitude values and returns results in latitude and longitude. We have to then show the results back on the Silverlight app.
How to do the conversion. does anyone have any code for this.
The SL app has to be in Nad1983UTM Zone17N ( or another zone) and the web service cannot be changed and hence looking for conversion code.
Can some one please provide some code or some clue about this.

[JenniferNery]

I think you can call ProjectAsync() with the following WKT
http://spatialreference.org/ref/epsg/26917/esriwkt/

You can look at this sample: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Project