insert data into sql database using jquery ajax in asp.net c# -

i using 3 tier architecture , tried store data database using jquery ajax not getting response in success function

here code

portaldal.cs

public datatable insertfeedback(string name, string email, string category, string message)   {   sqlparameter[] parms = new sqlparameter[]{     new sqlparameter("@name",name),   new sqlparameter("@email",email),   new sqlparameter("@category",category),   new sqlparameter("@message",message)    };   return helper.executeparamerizedselectcommand("insert feedback(name,email,category,message) values(@name,@email,@category,@message)", commandtype.text, parms);   } 

portalbal.cs

 public datatable insertfeedback(string name, string email, string category, string message)   {   return portaldal.insertfeedback(name, email, category, message);    } 

portal.asmx.cs

 [webmethod]   public string insertfeedback(string name, string email, string category, string message)   {   datatable dt = detailsbal.insertfeedback(name, email, category, message);   return jsonconvert.serializeobject(dt);   } 

my jquery function.

$(document).ready(function () {   $('#submit').click(function () {    var name = $('#name').val();   var email = $('#email').val();   var category = $('#cate').val();   var msg = $('#msg').val();    insertfeedback(name,email,category,msg);   });    function insertfeedback(name,email,cat,msg)   {   $.ajax({   type: "post",   url: "portal.asmx/insertfeedback",   data: "{'name':'" + name + "','email':'" + email + "','category':'" + cat + "','message':'" + msg + "'}",    contenttype: "application/json; charset=utf-8",   datatype: "json",   success: function (data) {   alert("hi");   var obj = data.d;   if (obj == 'true') {   $('#name').val('');   $('#email').val('');   $('#cate').val('');   $('#msg').val('');   $('#lblmsg1').html("details submitted successfully");   window.location.reload();   }   },   error: function (result) {   alert("error");   }   });    }    }); 

i getting error alert message control not entering success function not showing error on browser

try code

$('#submit').click(function () {   insertfeedback(); });  function insertfeedback() { var model = new object();   model.name = $('#name').val();   model.email = $('#email').val();   model.category = $('#cate').val();   model.msg = $('#msg').val();  $.ajax({ type: "post", url: "portal.asmx/insertfeedback", data: model, datatype: "json", success: function (data) {      alert("hi");     // code     }, error: function (result) {     alert("error");  } }  

create 1 class 4 property

public class yourclass {  public string name { get; set; }  public string email { get; set; }  public string category { get; set; }  public string message { get; set; } } 

change method parameter class object. can recevie number of parameter ajax call 1 object.

[webmethod] public string insertfeedback(yourclass model) {  datatable dt = detailsbal.insertfeedback(model.name, model.email, model.category, model.message);  return jsonconvert.serializeobject(dt); }