[Awiion]

Еще проще:

 public string ReadString(int Length)
        {
            string Text;
            Text = Encoding.GetEncoding(1251).GetString(Reader.ReadBytes(Length), 0, Length);
 
            int Index = Text.IndexOf('\0');
            if (Index != -1)
            {
                Text = Text.Remove(Index);
            }
            return Text;
        }
Code: C#