Read and Write Memory c#

using System.IO;

// Create a MemoryStream object
using (MemoryStream memoryStream = new MemoryStream())
{
    // Create a StreamWriter object to write to the memory stream
    using (StreamWriter writer = new StreamWriter(memoryStream))
    {
        // Write some text to the memory stream
        writer.WriteLine("Hello, world!");
    }

    // Get the bytes from the memory stream
    byte[] bytes = memoryStream.ToArray();

    // Do something with the bytes, such as write them to a file
    File.WriteAllBytes("output.txt", bytes);
}

using System.IO;

// Read the contents of a file into a byte array
byte[] bytes = File.ReadAllBytes("input.txt");

// Create a MemoryStream object from the byte array
using (MemoryStream memoryStream = new MemoryStream(bytes))
{
    // Create a StreamReader object to read from the memory stream
    using (StreamReader reader = new StreamReader(memoryStream))
    {
        // Read the contents of the memory stream
        string text = reader.ReadToEnd();

        // Do something with the text
        Console.WriteLine(text);
    }
}