managed mbcs to wide

I have a byte array of MBCS characters to convert to Unicode wide characters. Any help? This doesn't work.

var encoder = new UnicodeEncoding();

while (true)
{
    int bytesRead = fstream.Read(buffer, 0, BUFFER_SIZE);
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    //could not read from file stream
    if (bytesRead == 0)
        break;

    Console.Write(encoder.GetString(buffer, 0, bytesRead));
}

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You should be able to use Encoding.Convert(srcEncoding, dstEncoding, ...) to do this.