How to convert raster to polygon in ArcGIS Engine after classify?

Discussion created by kjulistened on Dec 17, 2013
by " IMultivariateOp.MLClassify" method, I can classify the original raster to a new raster,as the figure below:

how to convert each of them to raster to polygon,and give them some atttribute like the names and the area?
I search for noting,can someone give me some ideal of detail or some code related?
Thanks ...