c# - System.IO.IOException: 'The process cannot access the file '@.txt' because it is being used by another process.'

Question

I am new to programming and I have a question. If I have two functions, one creates a text file and writes into it, while the other opens the same text file and reads from it.

The error I get is:

System.IO.IOException: 'The process cannot access the file '@.txt' because it is being used by another process.'

I have tried setting seperate timers to each of the functions but it still does not work. I think the best way would be that the function two does not start until function one ends.

Can you help me achieve this? Thank you very much! Mike

Source code:

public Form1() {
    InitializeComponent();
    System.Timers.Timer timerButtona1 = new System.Timers.Timer();
    timerButtona1.Elapsed += new ElapsedEventHandler(tickTimera1);
    timerButtona1.Interval = 3003;
    timerButtona1.Enabled = true;
}

private async void tickTimera1(object source, ElapsedEventArgs e) {
    function1();
    function2();
}

void function1() {
    List<string> linki = new List<string>();

    linki.Add("https://link1.net/");
    linki.Add("https://link2.net/");
    linki.Add("https://link3.net/");

    List<string> fileNames = new List<string>();

    fileNames.Add("name1");
    fileNames.Add("name2");
    fileNames.Add("name3");

    for (int x = 0; x < fileNames.Count; x++) {
        GET(linki[x], fileNames[x]);
        //System.Threading.Thread.Sleep(6000);
    }
}

async void GET(string link, string fileName) {
    var ODGOVOR = await PRENOS_PODATKOV.GetStringAsync(link);
    File.WriteAllText(@"C:Users..." + fileName + ".txt", ODGOVOR);
}

void function2() {
    string originalText = File.ReadAllText(@"C:Users...fileName.txt", Encoding.Default);
    dynamic modifiedText = JsonConvert.DeserializeObject(originalText);
    //then i then i read from the same text files and use some data from it..
}

Answer 1

You will have to close the file after editing it.

var myFile = File.Create(myPath);
//myPath = "C:file.txt"
myFile.Close();
//closes the text file for eg. file.txt
//You can write your reading functions now..

After closing it you can again use it(for reading)