Help please: Bing map does not display together with Esri layers

BinBin

I have two esri layers and one bing tilelayer in my Silverlight app, the two esri layers can display without bing layer, and the bing layer can display without the two esri layers, but if put them together, nothing will show.
Please help.

Below is my source code.

<esri:Map x:Name="MyMap"  >

<esri:Map.Extent>
<esri:Envelope  XMin="2471999.70000267" YMin="521998.699899673" XMax="2490000.30005074" YMax="534000.300050735">
</esri:Envelope>
</esri:Map.Extent>
           
<esri:Map.Layers >
               
<esri:ArcGISImageServiceLayer ID="Avista_2009"
                    Url="http://xyz.xyz.118.202/ArcGIS/rest/services/Avista_09/ImageServer"
                                          ImageFormat="JPG" Visible="True" />

<esri:ArcGISDynamicMapServiceLayer ID="facility"
                    Url="http://xyz.xyz.118.202/ArcGIS/rest/services/WSU_Facilities_API/MapServer"/>

<bing:TileLayer ID="bing" ServerType="Production" Token="Auw1cAvI7a0mgKhB3D_PpNRWpdU-zLF2191WF2H0mITWj_HiSGVGA9qme-vI7ZlB" />
               
               
</esri:Map.Layers>
</esri:Map>

DominiqueBroux

Very likely you run into a spatial reference issue.

You can't display together tiled layers or image layers with different spatial references. (it's ok for dynamic or feature layers because the projection is done on the fly by the server).

Bing maps are using web mercator spatial reference (102100), if your image server is not using this one, you won't be able to display both layers.