question related to finding big no in asp.net

if  there is 10 text box than no problem :)
while not possible to  judge 10 or two digit number in text box 0-9 is ok and you can find bigest no like this
string s = "149682735";
            char[] ch = s.ToCharArray();
              Array.Sort(ch);
              Array.Reverse(ch);// ch.Reverse();
              string big = ch[0].ToString();

if you specify by any special charchter than you can split by that character and applyfollwing process




happy coding :) :) :)