c# - How do I exclude raster layers from legend? (Silverlight, ArcGIS Server)

I'm trying to adjust my Print Widget so that raster layers do not show up in the legend. My thinking was that I could test for a layer type and not add the item to the legend if it is a raster.

Something like:

Foreach (layer in List)
    If layer is a raster:
        do nothing;
    Else: 
        Add it to the legend;

I know there's a LayerInfo thing out there but I'm not really sure how to use it. Incidentally, I'm new to C#/Silverlight/ArcGIS for Server so this simple task is a bit challenging for me. I did notice there was a GetType() method(?) that I might be able to use but I'm not sure if how if that is indeed the answer. The foreach legend item code already exists and such -- I'm looking to wrap some conditions around the legendItems.Add bit. I found the following resources, but not sure how to use them if they are helpful... http://help.arcgis.com/en/webapi/sil...o_members.html --> the "Type" property, perhaps?

Alternatively, if I'm going about this in a difficult/wrong way, feel free to point that out! I'm a new intern with no prior C#/ArcGIS Server/Silverlight experience so it's all a bit overwhelming.

Thanks in advance!

Thread on arcgis forums: http://forums.arcgis.com/threads/83788-How-do-I-retrieve-layer-type

additional thoughts: -- I'll somehow have to create a list of all the layers, too >_<.