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public interface IObjectContextFactory
{
    ObjectContext Create();

    ObjectContext Create(string connectionString);
}


public class DefaultObjectContextFactory : IObjectContextFactory
{

    public ObjectContext Create()
    {
        return this.Create(ConfigurationManager.ConnectionStrings["AspenConnectionString"].ConnectionString);
    }


    public ObjectContext Create(string connectionString)
    {
        if (string.IsNullOrEmpty(connectionString))
            throw new ArgumentNullException("connectionString");

        var connection = new SqlConnection(connectionString);

        var workspace = new MetadataWorkspace(
                                new string[] { "res://*/" },
                                new Assembly[] { GetModelMappingConfigurationAssembly() });

        CheckAndBeSureMetadataIsLoaded(workspace);

        return this.Create(new EntityConnection(workspace, connection));
    }



    private ObjectContext Create(EntityConnection con)
    {
        if (con == null)
            throw new ArgumentNullException("con");

        return new ObjectContext(con);
    }


    private static void CheckAndBeSureMetadataIsLoaded(MetadataWorkspace workspace)
    {
        Debug.Assert(workspace.GetItemCollection(DataSpace.CSpace).GetItems<EntityType>().Count != 0);
        Debug.Assert(workspace.GetItemCollection(DataSpace.SSpace).GetItems<EntityType>().Count != 0);
    }


    private Assembly GetModelMappingConfigurationAssembly()
    {
        var assemblies = AppDomain.CurrentDomain.GetAssemblies();

        var assembly = assemblies.Where(a => a.FullName.Contains("EntityMapping")).SingleOrDefault();

        if (assembly == null)
            throw new MappingException("Can't find the Assembly with the Entity Configuration Mapping");

        return assembly;
    }
}

Note: The GetModelMappingConfiguration will look through all referenced assemblies for a separate assembly where the EDMX file is located. Can probably be done much better, any suggestions?

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