Split Array into 2D based on 2 parameters C# -


i have text file have split string array based on new line.

string[] arr = s.split('\n');

now, need further categorize 2-dimensional array wherein each column new "transaction". text file contains info bank transactions, example being given below:

21...... 22.... 23..... 31.... 32..... 31..... 32..... 21.... 21..... 22....

the beginning of numbers signify new tx record begins @ new line. want make 2d array wherein each column grouped 1 tx beginning 21 until comes across next 21 (so record before it). 

 (int = 0; < arr.length; i++)         {             if (arr[i].startswith("21"))              {                 indices[i] = i;             }         }

i tried write code above check array element beginning 21 , storing index ends storing indices.

any appreciated!

what you'd need 

string[] arr = s.split('\n');  list<list<string>> listoflists = new list<list<string>>(); //dynamic multi-dimensional list  //list hold lines after line "21" , line list<string> newlist = new list<string>();   listoflists.add(newlist);  for(int = 0; < arr.length; i++) {     if(arr[i].startswith("21"))     {         if(newlist.count > 0)         {                             newlist = new list<string>();  //make new list column             listoflists.add(newlist);      //add list of lines (one column) main list         }     }     newlist.add(arr[i]);  //add line column }

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