Get underlying linq query for FirstOrDefault with Entity Framework 5 (Code First) -

i can log underlying query of linq query using tostring() method.

string raw = query.where(..whatever..).tostring(); 

i need exact underlying query firstordefault() method

query.firstordefault().tostring() 

because bad performance query , want analyze it. here tostring() method returns class name.

is there possibility underlying query?