c# - Deserialization of an Ajax -

i have ajax webmethod.

from webmethod getdate() "var" returning json:

var json2 = "[{\"id\":1,\"datetime\":04/10/2017,\"col1\":1,\"col2\":2,\"col3\":3}]" 

error code:

invalid object passed in, ':' or '}' expected. (23): [{"id":1,"datetime":04/10/2017,"col1":1,"col2":2,"col3":3}]

my jquery code seems right:

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <script type="text/javascript">     $(document).ready(function () {         $("#<%= button1.clientid %>").click(function () {             var mo1 = $("#<%= textbox1.clientid %>").val();             var dy1 = $("#<%= textbox2.clientid %>").val();             var yr1 = $("#<%= textbox3.clientid %>").val();             var data = { mo:mo1, dy:dy1, yr:yr1 };             var json1 = json.stringify(data);             $.ajax             ({                 type: "post",                 contenttype: "application/json; charset=utf-8",                 datatype: "json",                 data: json1,                 url: "default.aspx/getdate",                 success: function (result) {                     $("#<%= textbox4.clientid %>").val(result.d);                     $("#<%= button2.clientid %>").trigger("click");                 },                 error: function (status, ex) {                     alert("error code: status: " + status + " ex: " + ex);                 }             });             return false;         });     }); </script> 

where error occurs in deserialization

    protected void btn2_click(object sender, eventargs e)     {         int oo = 0;         string[,] dataout = new string[100, 9];         var json2 = textbox4.text;         var serializer = new system.web.script.serialization.javascriptserializer();         list<data> data2 = serializer.deserialize<list<data>>(json2);         foreach (var element in data2)         {             oo += 1;             dataout[oo, 1] = convert.tostring(element.id);             dataout[oo, 2] = convert.tostring(element.datetime);             dataout[oo, 3] = convert.tostring(element.col1);             dataout[oo, 4] = convert.tostring(element.col2);             dataout[oo, 5] = convert.tostring(element.col3);         }      } 

i tried newtonsoft json.net:

list<data> data2 = jsonconvert.deserializeobject<list<data>>(json2); 

error code:

newtonsoft.json.jsonreaderexception occurred hresult=0x80131500 message=error parsing comment. expected: *, got 1. path '[0].datetime', line 1, position 23. 

how deserialzer function correctly?