Как записать картинку побайтово

private void button6_Click(object sender, EventArgs e)
{
string s = "";
 
StreamWriter sw = new StreamWriter(@"C:\temp1\11.txt", false);
 
DirectoryInfo directorySelected = new DirectoryInfo(textBox1.Text);
 
foreach (FileInfo file in directorySelected.GetFiles("*.*"))
{
 
s = s + "難" + file.Length + "難" + file.Name + "難";
 
StreamReader sr = file.OpenText();
string str = sr.ReadToEnd();
 
sw.Write(str);
// fs.Close(); 
 
}
 
sw.Write(s);
 
sw.Close();
 
string temp="";
 
temp = File.ReadAllText(@"C:\temp1\11.txt");
 
string[] split = temp.Split(new Char[] { '難' });
 
FileStream fstream = new FileStream(textBox2.Text, FileMode.OpenOrCreate);
 
byte[] array = System.Text.Encoding.Default.GetBytes(temp);
 
fstream.Write(array, 0, Convert.ToInt32(split[1]));
 
WriteAllBytes( )
 
fstream.Close();
 
}

            System.IO.MemoryStream ms = new System.IO.MemoryStream();
 
            Image.FromFile("oboina1.jpg").Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
 
            System.IO.File.WriteAllText("1.txt", Encoding.Default.GetString(ms.ToArray()));
 
            System.IO.File.WriteAllBytes("oboina2.jpg", Encoding.Default.GetBytes(System.IO.File.ReadAllText("1.txt")));