How to perform the overlay on raster in ArcObject C#?

Discussion created by kjulistened on Dec 13, 2013
using the "IMultivariateOp.MLClassify" method, I can classify the raster into many classes,you know that.
But now, what I am going to do is to analyze "where and how much the forest areas are decreasing or increasing",That is,for instance,I got two raster layers and I must perform the overlay of raster someway like "raster calculator" in ArcToolbox.So how to perform it using C# in ArcObject?
Thanks very much.