Untitled

How do I use File.ReadAllBytes In chunks
string location1 = textBox2.Text;
        byte[] bytes = File.ReadAllBytes(location1);
        string text = (Convert.ToBase64String(bytes));
        richTextBox1.Text = text;

System.IO.FileStream fs = new System.IO.FileStream(textBox2.Text, System.IO.FileMode.Open);
byte[] buf = new byte[BUF_SIZE];
int bytesRead;

// Read the file one kilobyte at a time.
do
{
    bytesRead = fs.Read(buf, 0, BUF_SIZE);
    // 'buf' contains the last 1024 bytes read of the file.

} while (bytesRead == BUF_SIZE);

fs.Close();

}

using(var sr = new StreamReader(File.Open(textBox2.Text, FileMode.Open))
{
    while (sr.Peek() >= 0)
    {
        Console.WriteLine(sr.ReadLine());
     }
}

string location1 = textBox2.Text;
    string text  = String.Empty;
    using (TextReader reader = File.OpenText(location1 ))
    {
           do
           {
           string line = reader.ReadLine();
               text+=line;
            }
            while(line!=null)

    }

var path = @"C:Tempfile.blob";

        using (Stream f = new FileStream(path, FileMode.Open))
        {
            int offset = 0;
            long len = f.Length;
            byte[] buffer = new byte[len];

            int readLen = 100; // using chunks of 100 for default

            while (offset != len)
            {
                if (offset + readLen > len)
                {
                    readLen = (int) len - offset;
                }
                offset += f.Read(buffer, offset, readLen);
            }
        }

string result = string.Empty;

            foreach (byte b in buffer)
            {
                result += Convert.ToChar(b);
            }