private static readonly Encoding Windows1251Encoding = Encoding.GetEncoding(1251);
static string FromCyrillicStringArray(string[] values)
{
var bytes = new byte[values.Length];
for (var i = 0; i < values.Length; i++)
bytes[i] = Convert.ToByte(values[i]);
return Windows1251Encoding.GetString(bytes);
}
...
var codes = new[] { "207", "192", "207", "192" };
Console.WriteLine(FromCyrillicStringArray(codes) == "ПАПА"); // true