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There is nothing wrong in the syntax of my code but whenever I try to run it keeps saying "The process cannot access the file because it is being used by another process". The only way I am running my application is my ending my application from the task manager. Please help me by explaining why this is happening and how to fix it.

private void btnLogin_Click(object sender, EventArgs e)

{

    if (File.Exists("users.txt"))

    {

        string users = File.ReadAllLines("users.txt");

        bool userFound = false;



        foreach (string user in users)

        {

            string splitDetails = user.Split('~');



            string username = splitDetails[1];

            string password = splitDetails[2];



            if ((txtBoxUsername.Text == username) && (txtBoxPassword.Text == password))

            {

                userFound = true;

                break;

            }

        }



        if (userFound)

        {

            Hide();

            HomeForm home = new HomeForm();

            home.Show();

        }

        else

        {

            MessageBox.Show("User details are incorrect",

                            "Incorrect details entered");

        }

    }

    else

    {

        MessageBox.Show("No users have been registered", "No users");

    }

}



private void btnRegister_Click(object sender, EventArgs e)

{

    Hide();

    RegisterForm registerForm = new RegisterForm();

    registerForm.Show();

}

This application is for my a level software systems development coursework and I am coding it in c#. I have only been learning c# for the past 5 months so I am still a beginner. I have already tried to find the answer to my problem in stack overflow and other websites.

I am expecting my application to launch when I press run, but instead I get a dialog box saying:

Error Unable to copy file "objDebugSSD AS2 coursework.exe" to "binDebugSSD AS2 coursework.exe". The process cannot access the file 'binDebugSSD AS2 coursework.exe' because it is being used by another process.

SSD AS2 coursework

Check if you are closing all windows of your application when finalizing the app.
You must use Application.Exit() in any events that are going to finalize your application.

You can read more on the Documentation

It seems like the file you are trying to open is being used by another process try to close your text editor or another program writing to that file.

it is still possible to overcome the issue by using FileShare.ReadWrite and use the file from multiple processes, example on the following code:

FileStream fileStream = new FileStream("c:users.txt", FileMode.Open, 

FileAccess.Read, FileShare.ReadWrite);

StreamReader fileReader = new StreamReader(fileStream);



while (!fileReader.EndOfStream)

{

    string user = fileReader.ReadLine();



    string splitDetails = user.Split('~');

    // the rest of the user logic in here...

}





fileReader.Close();

fileStream.Close();