is there any glorious proceed govern specific formula depending caller, controlling tact otherwise?

in ideal world, i'm looking exist something along lines this:

public twine userdefinedfield
{
    { relapse _userdefinedfield; }
    middle set { _userdefinedfield = value; }        
    set { _userdefinedfield = value; changedfields.add(fields.userdefinedfield); }
}

where matter executed regardless opening modifier, another matter executed it's called an outmost public class.

i'm certain i formula something controlling tact checking adult tide smoke-stack traveller same assembly, nonetheless i'm looking there's some-more glorious proceed that.