guess_encoding.cs

EncodingInfo[] encodings = Encoding.GetEncodings();
foreach(EncodingInfo srcInfo in encodings) {
    foreach(EncodingInfo dstInfo in encodings) {
        Encoding src = srcInfo.GetEncoding();
        Encoding dst = dstInfo.GetEncoding();
        string res = dst.GetString(Encoding.Convert(src,dst,dst.GetBytes(data)));
        if (res.IndexOf("котор")>-1) {
            string[] trace = {src.EncodingName, dst.EncodingName, src.CodePage.ToString(), dst.CodePage.ToString(),res};
            System.Diagnostics.Debug.WriteLine(string.Join("\n",trace));
        }
    }
}