C# How to modify text file

Question

I need to read accounts.txt and add/change number after password

Here is accounts.txt

user|password
user1|password1

After starting

user|password|1
user1|password1|1

After closing

user|password|0
user1|password1|0

Sorry for my english

Answer 1

Add this reference first System.IO Then:

For reading:

string[] accounts= File.ReadAllLines("accounts.txt");
//each item of array will be your account

For modifying :

accounts[0] += "|1";//this adds "|1" near password
accounts[0].Replace("|1","|0"); this will change the "|0" text to "|1"

And For writing:

File.WriteAllLines("accounts.txt",accounts);