How to show layers in Pulkovo 1942 in OpenStreetMap?

[AnatoliiTerentiev]

Dear Gurus!
I have some layers in Pulkovo1942

<!-- Map Control -->
<esri:Map x:Name="Map" Background="White" WrapAround="true" Extent="6095000,6810000,6900000,7258000">
     <esri:ArcGISDynamicMapServiceLayer ID="BaseLayer"                                              
        Url="http://terentievai:6080/ArcGIS/rest/services/rk/MapServer" />
</esri:Map>

And now I need to use OpenStreetMap , which is in EPSG:4326. I think something like:

        
<esri:Map x:Name="Map" Background="White" WrapAround="true" Extent="3000000,8000000,4000000,10008000">
        <esriOSM:OpenStreetMapLayer ID="BaseLayer" Style="Mapnik"  />
</esri:Map>
<esri:Attribution Layers="{Binding ElementName= Map, Path=Layers}" />

How can I combine these two coordinate systems?

[AnatoliiTerentiev]

How to reproject map from one coordinate system to another?

[DominiqueBroux]

DynamicMapService layers are automatically projected in the map Spatial Reference by the server.

Set 2 layers in your map:

1. OpenStreetMapLayer


2. DynamipMapServiceLayer

And that's it.

Sidenote: OpenStreetMap is not in EPSG:4326 but in WebMercator. Your map initial extent coordinates must use this SR.