Hello,Please use ESRI.ArcGIS.AxControls assembly if you are using the Engine controls; use ESRI.ArcGIS.ADF Assembly to replace the utilities assembly. Details please refer to the links:How to migrate ArcGIS 9.3 Desktop and Engine stand-alone applications to ArcGIS 10http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#/How_to_migrate_ArcGIS_9_3_Desktop_and_Engine_stand_alone_applications_to_ArcGIS_10/0001000002ns000000/ESRI.ArcGIS.ADF Assemblyhttp://help.arcgis.com/en/sdk/10.0/arcobjects_net/componenthelp/index.html#/Overview/000200002pnn000000/Regards,Chelsea
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