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copied!<p>Three things:</p> <ul> <li>Don't close the <code>StreamWriter</code>. That will close the <code>MemoryStream</code>. You do need to flush the writer though.</li> <li>Reset the position of the stream before reading.</li> <li>If you're going to write directly to the stream, you need to flush the writer first.</li> </ul> <p>So:</p> <pre><code>using (var stream = new MemoryStream()) { var sw = new StreamWriter(stream); sw.Write("{"); foreach (var kvp in keysAndValues) { sw.Write("'{0}':", kvp.Key); sw.Flush(); ser.WriteObject(stream, kvp.Value); } sw.Write("}"); sw.Flush(); stream.Position = 0; using (var streamReader = new StreamReader(stream)) { return streamReader.ReadToEnd(); } } </code></pre> <p>There's another simpler alternative though. All you're doing with the stream when reading is converting it into a string. You can do that more simply:</p> <pre><code>return Encoding.UTF8.GetString(stream.GetBuffer(), 0, (int) stream.Length); </code></pre> <p>Unfortunately <code>MemoryStream.Length</code> will throw if the stream has been closed, so you'd probably want to call the <code>StreamWriter</code> constructor that doesn't close the underlying stream, or just don't close the <code>StreamWriter</code>.</p> <p>I'm concerned by you writing directly to the the stream - what is <code>ser</code>? Is it an XML serializer, or a binary one? If it's binary, your model is somewhat flawed - you shouldn't mix binary and text data without being very careful about it. If it's XML, you may find that you end up with byte-order marks in the middle of your string, which could be problematic.</p>

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