var sampleStr = "10,11,12,13,014,15,21,22,23,24,25,111,112,113,0114,115";

  var strs = sampleStr.Split(',');

  strs = strs.OrderBy(x => x).ToArray();
  
  //一般狀況 :0114,014,10,11,111,112,113,115,12,13,15,21,22,23,24,25