I am working by following the request to re-encrypt something that has been read before.

    private void EncryptFile(string inputFile, string password)
    {
        string outputFile = inputFile + ".MM76";
        byte[] salt = GenerateRandomSalt();

        using (FileStream fsCrypt = new FileStream(outputFile, FileMode.Create))
        {
            byte[] passwordBytes = System.Text.Encoding.UTF8.GetBytes(password);
            RijndaelManaged AES = new RijndaelManaged();
            AES.KeySize = 256;
            AES.BlockSize = 128;
            AES.Padding = PaddingMode.PKCS7;
            var key = new Rfc2898DeriveBytes(passwordBytes, salt, 50000);
            AES.Key = key.GetBytes(AES.KeySize / 8);
            AES.IV = key.GetBytes(AES.BlockSize / 8);
            AES.Mode = CipherMode.CFB;
            fsCrypt.Write(salt, 0, salt.Length);

            using (CryptoStream cs = new CryptoStream(fsCrypt, AES.CreateEncryptor(), CryptoStreamMode.Write))
            {
                using (FileStream fsIn = new FileStream(inputFile, FileMode.Open))
                {
                    byte[] buffer = new byte[1048576];
                    int read;
                    while ((read = fsIn.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        cs.Write(buffer, 0, read);
                    }
                }
            }
        }
    }

exactly in this part;

                 using (FileStream fsIn = new FileStream(inputFile, FileMode.Open))

I tried Dispose and Delete but it doesn’t work. I cannot perform any action on this file.