C # base-out and Ref fields

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceconsoleapplication2{classProgram {Static voidMain (string[] args) {            stringOutstring ="This is the outstring value";            Console.WriteLine (outstring); BOOLOK = Outmethod ( outoutstring);            Console.WriteLine (outstring); Console.WriteLine (OK.)            ToString ()); /*I'm the dividing line .*/            stringRefstring ="This is the refstring value";            Console.WriteLine (refstring); BOOLOkk = Refmethod (refrefstring);            Console.WriteLine (refstring); Console.WriteLine (Okk.            ToString ());        Console.readkey (); }        Static BOOLOutmethod ( out stringstr) {STR="This is the new outstring value";//value must be set            return true; }        Static BOOLRefmethod (ref stringstr) {STR="This is the new outstring value";//This sentence can not be written, that is, do not reset the value            return true; }    }}

C # base-out and Ref fields