Asp.net form button is not triggering the post pack in updatepanel with jquery validation engine in content page

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C#

ASP.NET

jQuery

I have a ASP.NET FORM with Master page , and have placed the form controls inside the updatepanel and i am using Jquery - validation engine to validate the form controls . all working fine . but submit button is not triggering the postback event . I have tried all after googling many suggestion . but yet to get the solution for this issue . It would be great if any expert can help me to resolve this issue . Thanks in Advance . _ Martin

<asp:content id="Content1" contentplaceholderid="MainContent" runat="Server">
   <div class="col-xl-6 col-lg-6 col-md-6 col-sm-12 col-12 nopl ">
      <div class="login-form">
         <asp:updatepanel runat="server" id="usernameupdatepanel" updatemode="Conditional">
            <contenttemplate>
               <div class="form-group">
                  Full Name
                  <asp:textbox runat="server" id="txtFullName" cssclass="form-control validate[required]" placeholder="Full Name">
               </div>
               <div class="form-group">
                  Mobile Number
                  <asp:textbox runat="server" id="txtMobileNumber" cssclass="form-control validate[required,custom[integer],maxSize[10],minSize[10]]" placeholder="Mobile Number" onchange="CheckUserName(this)">
               </div>
               <div class="form-group">
                  Email
                  <asp:textbox runat="server" id="txtEmailID" cssclass="form-control validate[required,custom[email]]" placeholder="EMail - ID">
               </div>
               <div class="form-group">
                  <%----%>
                  <asp:textbox runat="server" id="password" name="password" cssclass="form-control validate[required]" clientidmode="Static" textmode="Password" placeholder="Password">
               </div>
               <div class="form-group">
                  <asp:textbox runat="server" id="confirm_password" name="confirm_password" textmode="Password" cssclass="form-control validate[required,equals[password]]" placeholder="Confirm Password">
               </div>
               <div class="form-group">
                  <asp:image id="imgCaptcha" runat="server" imageurl="~/CaptchaImage.aspx">
                  <br>
                  <asp:label runat="server" id="lblCaptchaMessage">
               </div>
               <div class="form-group">
                  <asp:textbox id="txtCaptchaText" runat="server" width="100px">
                  [Type Security code here]
               </div>
               <asp:hiddenfield id="hdnIpaddress" runat="server" clientidmode="Static">
               <asp:hiddenfield id="hdnCountry" runat="server" clientidmode="Static">
               <asp:hiddenfield id="hdnCity" runat="server" clientidmode="Static">
               <asp:button id="btnSubmit" runat="server" class="btn btn-default btn-block mb10" text="Submit" onclick="btnSubmit_Click">
               <asp:label id="lblMessage" runat="server">
 
               $(function () {
                  $("[id*=btnSubmit]").click(function () {
                     $("#AYform").validationEngine('attach', { promptPosition: "topRight", scroll: false });
                  });
                  var prm = Sys.WebForms.PageRequestManager.getInstance();
                  if (prm != null) {
                     prm.add_initializeRequest(function (sender, e) {
                        if (sender._postBackSettings.panelsToUpdate.join().indexOf("usernameupdatepanel") != -1) {
                           if (!$("[id*=usernameupdatepanel]").validationEngine('validate')) {
                              e.set_cancel(true);
                           }
                        }
                     });
                  };
               });

What I have tried:

I have tried changing all asyn trigger in asp.net webpage