JObject jo = (JObject)JsonConvert.DeserializeObject(CurrentSelectedItemReq);

{
 "rows":[
  [
   {"NumIid":"001"},
   {"PicUrl":"xxx.png"},
   {"Title":"xxxxx"},
   {"Price":"xxx"},
   {"OuterId":"xxxx"} 
  ],
  [
   {"NumIid":"002"},
   {"PicUrl":"xxx.png"},
   {"Title":"xxxxx"},
   {"Price":"xxx"},
   {"OuterId":"xxxx"} 
  ],
  [
   {"NumIid":"003"},
   {"PicUrl":"xxx.png"},
   {"Title":"xxxxx"},
   {"Price":"xxx"},
   {"OuterId":"xxxx"} 
  ]
  ]
}

for (int i = 0; i < arr.Count; i++) 
    {
      JArray arr2 = (JArray)arr[i];
      for (int j = 0; j < arr2.Count; j++) 
      {
        JObject obj = (JObject)arr2[j];

        Response.Write(obj["NumIid"]);
        Response.End();
      }
        
    }

foreach (KeyValuePair<string, JToken> kp in obj) 
        {
          Response.Write(kp.Key);
          Response.Write("=");
          Response.Write(kp.Value);
          Response.End();
        }