process cannot access the file while trying to use StreamWriter

Question

The process cannot access the file 'C:\csharp\notebook.txt' because it is being used by another process.

How is it used by another process, if I haven't used StreamWriter yet? I want to add new text to te file by using ReadLine().

using System;
using System.IO;
namespace NLP
{
    class Exercise
    {
        static void Main(string[] args)
        {
            Directory.CreateDirectory(@"C:\csharp"); // creating the directory
            File.Create(@"C:\csharp\notebook.txt"); // creating the file
            if (File.Exists("C:\\csharp\\notebook.txt")) // checking if the file was succesfully created
                Console.WriteLine("Success");
            else
                Console.WriteLine("bruh");

            StreamWriter text = new StreamWriter(@"C:\csharp\notebook.txt");
        }
    }
}

I've checked if there are any processes using the file, but there are none.

Answer 1

It is because File.Create returns a Stream that you do not close.

You can simplify your code by writing:

File.AppendAllLines(@"C:\csharp\notebook.txt", new[] { "My new line" });

It will create the file if it does not exist