How to call webmethod in Asp net C

Question

I want to call a web method in asp net c  application using the following code  Jquery   jQuery ajax       url   AddToCart aspx AddTo Cart       type   POST       data     quantity        total qty      itemId      itemId            contentType   application json  charset utf-8       dataType   json       beforeSend  function                        alert  Start                              success  function  data                     alert  a                         failure  function  msg    alert  Sorry                    C  Code    System Web Services WebMethod  public static string AddTo Cart int quantity  int itemId        SpiritsShared ShoppingCart AddItem itemId  quantity             return  Add       But it always call page load  How can i fix it

User · Answer

The problem is at  System Web Services WebMethod   add  WebMethod EnableSession   false   and you could get rid of page life cycle  by default EnableSession is true in Page and making page to come in life though life cycle events      Please refer below page for more details  http   msdn microsoft com en-us library system web configuration pagessection enablesessionstate aspx

User · Answer

you need to JSON stringify the data parameter before sending it

User · Answer

This is a bit late  but I just stumbled on this problem  trying to resolve my own problem of this kind  I then realized that I had this line in the ajax post wrong   data     quantity        total qty      itemId      itemId          It should be   data    quantity        total qty      itemId       itemId           As well as the WebMethod to   public static string AddTo Cart string quantity  string itemId    And this resolved my problem   Hope it may be of help to someone else as well

User · Answer

There are quite a few elements of the   Ajax   that can cause issues if they are not defined correctly  I would suggest rewritting your javascript in its most basic form  you will most likely find that it works fine   Script example     ajax       type   POST       url    Default aspx TestMethod       data    message   HAI          contentType   application json  charset utf-8       success  function  data            console log data              failure  function  response            alert response d               WebMethod example    WebMethod  public static string TestMethod string message         return  The message    message

User · Answer

Necro ing this Question     You need to change the data being sent as Stringified JSON  that way you can modularize the Ajax call into a single supportable function   First Step  Extract data construction          This helper is used to call WebMethods from the page WebMethods aspx         method - String value  the name of the Web Method to execute     data - JSON Object  the JSON structure data to pass  it will be Stringified         before sending     beforeSend - Function xhr  sett      success - Function data  status  xhr      error - Function xhr  status  err      function AddToCartAjax method  data  beforeSend  success  error          ajax           url   AddToCart aspx      method          data  JSON stringify data           type   POST           dataType   json           contentType   application json  charset utf-8           beforeSend  beforeSend          success  success          error  error            Second Step  Generalize WebMethod   WebMethod  public static string AddTo Cart   object items         var js   new JavaScriptSerializer        var json   js ConvertToType lt Dictionary lt string   int gt  gt   items         SpiritsShared ShoppingCart AddItem json  itemId    json  quantity               return  Add       Third Step  Call it where you need it  This can be called just about anywhere  JS-file  HTML-file  or Server-side construction   var items      quantity   total qty   itemId   itemId     AddToCartAjax  AddTo Cart   items      function  xhr  sett         beforeSend         alert  Start              function  data  status  xhr          success         alert  a           function xhr  status  err        error         alert  Sorry

User · Answer

One problem here is that your method expects int values while you are passing string from ajax call  Try to change it to string and parse inside the webmethod if necessary      System Web Services WebMethod  public static string AddTo Cart string quantity  string itemId          parse parameters here     SpiritsShared ShoppingCart AddItem itemId  quantity             return  Add       Edit   or Pass int parameters from ajax call

User · Answer

I m not sure why that isn t working  It works fine on my test   But here is an alternative technique that might help   Instead of calling the method in the AJAX url  just use the page  aspx url  and add the method as a parameter in the data object   Then when it calls page load  your data will be in the Request Form variable   jQuery  jQuery ajax       url   AddToCart aspx       type   POST       data            method   AddTo Cart   quantity  total qty  itemId  itemId            dataType   json       beforeSend  function              alert  Start                   success  function  data            alert  a               failure  function  msg    alert  Sorry                C  Page Load   if   Page IsPostBack        if  Request Form  method       AddTo Cart                 int q  id          int TryParse Request Form  quantity    out q           int TryParse Request Form  itemId    out id           AddTo Cart q id

User · Answer

Here is your answer  use                       jquery json-2 2 min js                        and                    jquery-1 8 3 min js   Javascript     function CallAddToCart eitemId  equantity       var itemId   Number eitemId      var quantity   equantity     var dataValue     itemId      itemId      quantity      quantity              ajax              url   AddToCart aspx AddTo Cart              type   POST              dataType   json              data  dataValue             contentType   application json  charset utf-8              success  function  msg                    alert  Success                             error  function      alert arguments 2                             and your C  web method should be   WebMethod   ScriptMethod ResponseFormat   ResponseFormat Json   public static string AddTo Cart int itemId  string quantity       SpiritsShared ShoppingCart AddItem itemId  quantity           return  Item Added Successfully       From any of the button click or any other html control event you can call to the javascript method with the parameter which in turn calls to the webmethod to get the value in json format

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