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 i

Answer 1

after writing your text file, you should close it first before proceeding to your second function:

var myFile = File.Create(myPath);
//some other operations here like writing into the text file
myFile.Close(); //close text file
//call your 2nd function here

Just to elaborate:

public void Start() {
    string filename = "myFile.txt";
    CreateFile(filename); //call your create textfile method
    ReadFile(filename); //call read file method
}

public void CreateFile(string filename) {
    var myFile = File.Create(myPath); //create file
    //some other operations here like writing into the text file
    myFile.Close(); //close text file
}

public void ReadFile(string filename) {
    string text;
    var fileStream = new FileStream(filename, FileMode.Open, 
    FileAccess.Read); //open text file
    //vvv read text file (or however you implement it like here vvv
    using (var streamReader = new StreamReader(fileStream, Encoding.UTF8))
    {
        text = streamReader.ReadToEnd();
    }
    //finally, close text file
    fileStream.Close();
}

The point is, you have to close the FileStream after you are done with any operations with your file. You can do this via myFileStream.Close().

Moreover, File.Create(filename) returns a FileStream object which you can then Close().