How to: Check login name availability in ASP.NET MVC using jQuery Validation plug-in

I need to write comments for the below code, bcoz of lack of time i am posting only abstract things,if you want to know something, write comment, i will reply.

HTML login control

< input type="text" name="txtUserName" id="txtUserName" class="textBoxes" />

jQuery Rule: Add the below rule into script tag in header & add reference to jquery-1.2.6.js,jquery.validate.js in Head Element

 

$(document).ready(function() {

         $("#frmSelfRegister").validate({

             rules: {

   txtUserName:

                     {

                         required: true,

                         remote: { type: "post", 

                                   url: "Register/IsLoginAvailable" }

                    },

    messages:{

txtUserName: { required: "User Name is Required.",

                                remote: jQuery.format("{0} is not available.")}

     }

   });

     });

The above validation code executed when the focus changes from txtUserName to some other, it will call IsLoginAvailable method available in the RegisterController, as specified in the url.

Controller Code :

Below code is the one which checks for availability of a username & returns the status to above jQuery Method. The following methods return type is JsonResult because remote method of jQuery accepts the JsonResult object only.

        

[AcceptVerbs(HttpVerbs.Post)]

        public JsonResult IsLoginAvailable(FormCollection collection)

            {

                JsonResult result = new JsonResult();

                try

                {

                       ilogIn.Text = this.GetLoginByUsername(collection.Get("txtUserName").ToString().Trim());

                       

                }

                catch (Exception ex)

                {

                    Helper.ErrLogger(ex.Message);

                }

                if (ilogIn.Text == collection.Get("txtUserName").ToString())

                {

                    result.Data = false;

                }

                else

                {

                    result.Data = true;

                    

                }

                return result;

            }