c# - find the second highest frequency of the character in the string -

i want find second highest frequency of character in string. example: abccddd

o/p should : c

i tried dictionary. storing in dictionary. moreover, sorting it. dont know how should proceed.

string input = tb_input.text; dictionary<string, int> di = new dictionary<string, int>();  (int = 0; < input.length; i++) {     if (di.containskey(input[i].tostring()))     {         int value = di[input[i].tostring()];                        value++;          di[input[i].tostring()] = value;     }     else     {         di.add(input[i].tostring(), 0);     } }  var items = di.values.tolist();  items.orderbydescending(x => x).tolist(); 

you're storing number of occurrences in items. should store character well:

var items = di.orderbydescending(x => x.value).tolist();  return items[1].key; 

also, why start 0? should add 1 dictionary, when it's not there:

else {     di.add(input[i].tostring(), 1); } 

update

just let know, can solved using linq:

return input.groupby(x => x).orderbydescending(x => x.count()).elementat(1).key;