disabling controls is not working in my view

Question

In my view:

<script type="text/javascript">

$(document).ready(function() {

var disabled = <%=ViewData["disablecontrols"].ToString()%>;

if (disabled) {

$('input,select').attr('disabled',disabled);

}

})

</script>

<input type="text"  name="patientName">

 

On clicking New button it directs to newdetail controller 

 

In my controller : 

public ActionResult NewOperation(string button)

{

PatientDemoVM patientpersonal = new PatientDemoVM();

if (button == "New")

{

ViewData["disablecontrols"] = false;

patientpersonal.PatientCode = null;

return View("PatDemo", patientpersonal);

}

return View();

}