How to get values from txt file in my app

Question

I make an application using txt file . I add the student name and Degree in one line And sperat them by ";" semycoln I used stream reader array to read lines But how to take the total of values of degree only of every student and but this total in a text box. I want to plus student one degree to student two and put the total ( the numbers of student is diffrent from user to user )