how to chunk files in C# ?

/// <summary>
/// Reads data from a stream until the end is reached. The
/// data is returned as a byte array. An IOException is
/// thrown if any of the underlying IO calls fail.
/// </summary>
/// <param name="stream">The stream to read data from</param>
public static byte[] ReadFully (Stream stream)
{
    byte[] buffer = new byte[32768]; //set the size of your buffer (chunk)
    using (MemoryStream ms = new MemoryStream()) //You need a db connection instead
    {
        while (true) //loop to the end of the file
        {
            int read = stream.Read (buffer, 0, buffer.Length); //read each chunk
            if (read <= 0) //check for end of file
                return ms.ToArray();
            ms.Write (buffer, 0, read); //write chunk to [wherever]
        }
    }
}