ok, i'll try to explain better.
I have 2 formula fields, where i go to write a string as value, but i can 
access to this fields from .net.
Actually i can t acces to a normal field from . net where in the 
crystalreport selection formula i do something like that {field_desired}
="asdasdasd", and i want access in that way to a formula field 
{@formula_field}="asdasd", but it's doesnt work.