I am trying to make my web page friendly, but it appears it seems to be contradicting itself.

Here is my code below ( full webpage can be seen here  https://www.dropbox.com/s/cgd7tkds5kq73v8/ehi.html?dl=0 )

It seems line 4 and 5 are disallowing lines 26 and 27

As I want to show a loading gif when the users records are being updated, but it fails

2.    $(document).ready(function () {
3. 
   
4.                 $('#Main').show();
5.                 $('#Wait').hide();
6. 
   
7.                   $('#Add_Submit').on("click", function (e) {
8.                       e.preventDefault();
9.                                       
10.                     var last_Name = $("#First_Name").val();
11.                     var first_Name = $("#Last_Name").val();
12.                     var mobile = $("#Mobile").val();
13.                     var username = $("#Username").val();
14. 
    
15.                                     var last_Name = $('#Add_Form input[name=First_Name]').val();
16.                     var first_Name = $('#Add_Form input[name=Last_Name]').val();
17. 
    
18.                       var token = $('#Add_Form input[name="__RequestVerificationToken"]').val();
19.                          var form = $('#Add_Form');
20.                
21.              
22.               
23.                       if ($('#Add_Form').valid()) {//Valid
24.                                         
25.                          // $("#Add_Form :input").prop("disabled", true);
26.                           $('#Wait').slideDown(90).show();//.html('<div class="Text-Center">Thank you <br/>Your Account has been successfully updated</div>');
27.                 $('#Main2').slideDown(90).show().html('<div class="Text-Center">Thank you <br/>Please wait while we update your account <br/><br/><hr/><br/></div>');
28.                     Dawn(data);
29.                             $('#Main2').slideUp(100).html('<div class="Text-Center ">Success <br/> Thank you <br/>Your account has been updated <br/><br/><hr/><br/></div>');
30.                 $('#Wait').hide();
31. 
    
32.                 }
33.                 else {//INVALID
34. 
    
35.                     return;
36.                 }
37.