Given an IFeatureLayer, "theLayer", one would cast to a IGeoFeatureLayer, then get its IFeatureRenderer and cast that to a IClassBreaksRenderer. Then it is a s imple matter to set the IClassBreaksRenderer's Field to the field to be rendered. IGeoFeatureLayer lyr = theLayer as IGeoFeatureLayer; IFeatureRenderer ifr = lyr.Renderer; IClassBreaksRenderer cbr = ifr as IClassBreaksRenderer; cbr.Field = "someFieldName";
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