c# Compiled Queries -

i'm trying make compiled query, following msdn example @ http://msdn.microsoft.com/en-us/library/bb896297.aspx

here code

static readonly func<newtestdbcontext, string, long, iqueryable<routequerymodel>> s_compiledquery2 = compiledquery.compile<newtestdbcontext, string, long, iqueryable<routequerymodel>>( (db, currentlocation, x) =>      b in db.routes     let avg_rating = b.ratings.any() ?          b.ratings.select(r => r.rating1).average() :          0     let coorcount = b.coordinates.count()     let is_favorite = b.favorites.any(c => c.users_id == x) ?          true :          false     let distance_to_first_from_me = b.coordinates.         select(c => c.position).         firstordefault().         distance(dbgeography.fromtext(currentlocation, 4326))     let distance_to_last_from_me = b.coordinates.         orderbydescending(c => c.sequence).         select(d => d.position).         firstordefault().         distance(dbgeography.fromtext(currentlocation, 4326))     let distance_to_from_me = distance_to_first_from_me < distance_to_last_from_me ?              distance_to_first_from_me :              distance_to_last_from_me     select new routequerymodel      {          b = b,                          distance_to_from_me = distance_to_from_me.value,          avg_rating = avg_rating,          coorcount = coorcount,          is_favorite = is_favorite      } ); 

i'm getting following error

error 1 type 'w.models.newtestdbcontext' cannot used type parameter 'targ0' in generic type or method 'system.data.objects.compiledquery.compile(system.linq.expressions.expression>)'. there no implicit reference conversion 'w.models.newtestdbcontext' 'system.data.objects.objectcontext'.

i'm going guess here , suggest newtestdbcontext doesn't inherit objectcontext, or you're passing wrong object?

are using entity framework ?

have tried using reference code @ bottom of page, replacing adventureworks own schema ?

http://msdn.microsoft.com/en-us/library/system.data.objects.objectcontext.aspx

hope helps!