how to read a text file at real time

Question

i am facing problem to read a file which is locked by another program (a  c++ program) and changes text in text file. 

but i am not able to read  these text at real time(when my aplication is continuous running.)..i have tried with filesystem watcher with changed event   and seekfile method but not success..

 

 what i want actully i have a text file which is created by c++ program and i have to read this file text  when it get changed.....by my c# apllication at real time..