C# How to modify text file [closed]

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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);

Answer 2

Look at System.IO.File class, as well as general System.IO.Stream and System.IO.StreamReader classes.

There are a bunch of examples on the internet on how to read and write text files in .NET: http://msdn.microsoft.com/en-us/library/db5x7c0d(v=vs.110).aspx

Answer 3

Something like that :

    string[] lines = File.ReadAllLines(@"C:\filepath.txt");
    List<string> newlines = new List<string>();
    foreach(string line in lines)
    {
      string[] temp = line.Split('|');
      newlines.Add(temp[0] + "|" + temp[1] + "|" + "1");
    }

 File.WriteAllLines(@"C:\filepath.txt", newlines.ToArray())