The below script is perfectly working fine. The problem is even if the callback function is true but it's not ececuting "if (data == 'true') {" function. Advise me.

<script> 
function
 SendDataemail() { 
    $.ajax({ 
 type: "POST", 
 async: false, 
 url: $("#emailsubmit").attr('action'), 
 data: $("#emailsubmit").serialize(), 
 success: function (data, jqXHR, textStatus) { 
 alert(data); 
 if (data == 'true') { 
 //alert(data);
 
 alert("working"); 
 $('#emailsubmit').fadeOut('fast'); 
 } else if (data == 'false') { 
 //alert(data); 
 $('#new_thumb').remove(); 
 $('#statusform')
 
.append('<div id="new_thumb" style="padding:20px;">' + data + '</div>'); 
 $("#statusform").popup("open") 
 } else { 
 alert("none"); 
 }

postemail.cshtml