Fan.Sys.FanStr.upper C# (CSharp) Method

        public static string upper(string self)
        {
            StringBuilder s = new StringBuilder(self.Length);
              for (int i=0; i<self.Length; i++)
              {
            int ch = self[i];
            if ('a' <= ch && ch <= 'z') ch &= ~0x20;
            s.Append((char)ch);
              }
              return s.ToString();
        }