i have a problem with a project that I am working on for C#.

I have to do this ATM simulator project and I am having trouble with a section that goes like this.

Each time the application starts, the ATM check DailyBalances.txt to see if it contains a record with today's date. If not, then this is the first time the ATM is used today, and it automatically sets the ATM's balance to $5,000 and adds a record to DailyBalances.txt. The structure of the DailyBalances.txt is
Date (Date and Time)
ATM balance (Single)
Now I have a class called ATMManaget in my class library that has the CheckBalances method, but I don;t know how to code it. If anyone could help me out it would be greatly appreciated. I am a total newb to C#.

Thank you to anyone who can help me

JasonCamara