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copied!<p>Why have you converted binary (image) data to a string? This makes no sense... unless you are using base-64?</p> <p>Anyway, to reverse what you have done, you could try using <code>new MemoryStream(Encoding.UTF8.GetBytes(text))</code>?</p> <p>This will create a new MemoryStream primed with the string (via UTF8). Personally, I doubt it will work - you are going to run into a lot of encoding issues treating raw binary as UTF8 data... I expect either the read or write (or both) to throw an exception.</p> <p>(edit)</p> <p>I should add that to work with base-64, simply get the data as a <code>byte[]</code>, then call <code>Convert.ToBase64String(...)</code>; and to get back the array, just use <code>Convert.FromBase64String(...)</code>.</p> <hr> <p>Re your edit, this is precisely what I tried to warn about above... in .NET, a string is not just a <code>byte[]</code>, so you can't simply fill it with binary image data. A lot of the data simply won't make sense to the encoding, so might be quietly dropped (or an exception thrown).</p> <p>To handle raw binary (such as images) as strings, you need to use base-64 encoding; this adds size, however. Note that <code>WebClient</code> might make this simpler, as it exposes <code>byte[]</code> functionality directly:</p> <pre><code>using(WebClient wc = new WebClient()) { byte[] raw = wc.DownloadData("http://www.google.com/images/nav_logo.png") //... } </code></pre> <p>Anyway, using a standard <code>Stream</code> approach, here's how to encode and decode the base-64:</p> <pre><code> // ENCODE // where "s" is our original stream string base64; // first I need the data as a byte[]; I'll use // MemoryStream, as a convenience; if you already // have the byte[] you can skip this using (MemoryStream ms = new MemoryStream()) { byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = s.Read(buffer, 0, buffer.Length)) > 0) { ms.Write(buffer, 0, bytesRead); } base64 = Convert.ToBase64String(ms.GetBuffer(), 0, (int) ms.Length); } // DECODE byte[] raw = Convert.FromBase64String(base64); using (MemoryStream decoded = new MemoryStream(raw)) { // "decoded" now primed with the binary } </code></pre>

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